51
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Fujita T, Yamane M, Sameera WMC, Mitsunuma H, Kanai M. Siloxy Esters as Traceless Activators of Carboxylic Acids: Boron‐Catalyzed Chemoselective Asymmetric Aldol Reaction**. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202109788] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Taiki Fujita
- Graduate School of Pharmaceutical Sciences The University of Tokyo 7-3-1 Hongo, Bunkyo-ku Tokyo 113-0033 Japan
| | - Mina Yamane
- Graduate School of Pharmaceutical Sciences The University of Tokyo 7-3-1 Hongo, Bunkyo-ku Tokyo 113-0033 Japan
| | - W. M. C. Sameera
- Institute of Low Temperature Hokkaido University Kita-19, Nishi-8, Kita-Ku Sapporo 060-0819 Japan
| | - Harunobu Mitsunuma
- Graduate School of Pharmaceutical Sciences The University of Tokyo 7-3-1 Hongo, Bunkyo-ku Tokyo 113-0033 Japan
| | - Motomu Kanai
- Graduate School of Pharmaceutical Sciences The University of Tokyo 7-3-1 Hongo, Bunkyo-ku Tokyo 113-0033 Japan
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52
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Fujita T, Yamane M, Sameera WMC, Mitsunuma H, Kanai M. Siloxy Esters as Traceless Activators of Carboxylic Acids: Boron-Catalyzed Chemoselective Asymmetric Aldol Reaction*. Angew Chem Int Ed Engl 2021; 60:24598-24604. [PMID: 34496127 DOI: 10.1002/anie.202109788] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2021] [Revised: 08/23/2021] [Indexed: 11/10/2022]
Abstract
The catalytic asymmetric aldol reaction is among the most useful reactions in organic synthesis. Despite the existence of many prominent reports, however, the late-stage, chemoselective, catalytic, asymmetric aldol reaction of multifunctional substrates is still difficult to achieve. Herein, we identified that in situ pre-conversion of carboxylic acids to siloxy esters facilitated the boron-catalyzed direct aldol reaction, leading to the development of carboxylic acid-selective, catalytic, asymmetric aldol reaction applicable to multifunctional substrates. Combining experimental and computational studies rationalized the reaction mechanism and led to the proposal of Si/B enediolates as the active species. The silyl ester formation facilitated both enolization and catalyst turnover by acidifying the α-proton of substrates and attenuating poisonous Lewis bases to the boron catalyst.
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Affiliation(s)
- Taiki Fujita
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan
| | - Mina Yamane
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan
| | - W M C Sameera
- Institute of Low Temperature, Hokkaido University, Kita-19, Nishi-8, Kita-Ku, Sapporo, 060-0819, Japan
| | - Harunobu Mitsunuma
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan
| | - Motomu Kanai
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan
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53
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Li H, Shan L, Min L, Weng Y, Wang X, Hu Y. Tandem Synthesis of 1,3-Disubstituted Naphthalenes via TfOH-Promoted Directed-Aldol and Friedel-Crafts Reactions. J Org Chem 2021; 86:15011-15019. [PMID: 34634908 DOI: 10.1021/acs.joc.1c01713] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A TfOH-promoted tandem synthesis of 1,3-disubstituted naphthalenes is developed via a directed-aldol reaction and a Friedel-Crafts reaction. Two new C-C bonds and one new benzene ring are created efficiently in one pot due to the discovery of a TfOH-promoted highly chemoselective directed-aldol reaction between two different ketones with α-hydrogens.
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Affiliation(s)
- Hongchen Li
- Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology (Ministry of Education), Department of Chemistry, Tsinghua University, Beijing 100084, People's Republic of China
| | - Lidong Shan
- Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology (Ministry of Education), Department of Chemistry, Tsinghua University, Beijing 100084, People's Republic of China
| | - Lin Min
- Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology (Ministry of Education), Department of Chemistry, Tsinghua University, Beijing 100084, People's Republic of China
| | - Yunxiang Weng
- Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology (Ministry of Education), Department of Chemistry, Tsinghua University, Beijing 100084, People's Republic of China
| | - Xinyan Wang
- Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology (Ministry of Education), Department of Chemistry, Tsinghua University, Beijing 100084, People's Republic of China
| | - Yuefei Hu
- Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology (Ministry of Education), Department of Chemistry, Tsinghua University, Beijing 100084, People's Republic of China
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54
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Wasa M, Yesilcimen A. Enantioselective Cooperative Catalysis within Frustrated Lewis Pair Complexes. J SYN ORG CHEM JPN 2021. [DOI: 10.5059/yukigoseikyokaishi.79.1065] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Masayuki Wasa
- Department of Chemistry, Merkert Chemistry Center, Boston College
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55
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Hirao Y, Kanzaki Y, Mitsunuma H, Kanai M. A 4-hydroxyproline/trimethyl borate system for asymmetric synthesis of triple aldols from double aldol cyclic hemiacetals. Tetrahedron 2021. [DOI: 10.1016/j.tet.2021.132448] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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56
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Niki A, Ozeki M, Kuse A, Nakagawa S, Aoki S, Shigeta T, Kajimoto T, Iwasaki H, Kojima N, Arimitsu K, Hosoi S, Node M, Yamashita M, Kawasaki I. Construction of Acyclic All-Carbon Quaternary Stereocenter Based on Asymmetric Michael Addition of Chiral Amine. Chem Pharm Bull (Tokyo) 2021; 69:926-930. [PMID: 34470957 DOI: 10.1248/cpb.c21-00436] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Acyclic asymmetric quaternary stereocenters, which are composed of four carbon-carbon bonds, were finely constructed by utilizing a face-selective alkylation of enolate intermediates derived from an asymmetric Michael addition reaction of a chiral lithium amide with trisubstituted (E)-α,β-unsaturated esters. The present face-selective alkylation was able to employ diverse alkyl halides as an electrophile to afford various Michael adducts having an all-carbon quaternary stereocenter. With regard to the deprotection of the chiral auxiliary, N-iodosuccinimide used in our previous study did not work in the present cases; however, we found that pyridine iodine monochloride in the presence of H2O was effective to remove the bornyl group and the benzyl group on the amino group to provide the β-amino ester derivative.
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Affiliation(s)
- Aya Niki
- Department of Medicinal and Synthetic Chemistry, Faculty of Pharmaceutical Sciences, Mukogawa Women's University
| | - Minoru Ozeki
- Department of Medicinal and Synthetic Chemistry, Faculty of Pharmaceutical Sciences, Mukogawa Women's University
| | - Akiko Kuse
- Department of Pharmaceutical Manufacturing Chemistry, Kyoto Pharmaceutical University
| | - Shiho Nakagawa
- Department of Medicinal and Synthetic Chemistry, Faculty of Pharmaceutical Sciences, Mukogawa Women's University
| | - Shui Aoki
- Department of Medicinal and Synthetic Chemistry, Faculty of Pharmaceutical Sciences, Mukogawa Women's University
| | - Takashi Shigeta
- Department of Food Science and Biotechnology, School of Food and Nutritional Sciences, University of Shizuoka
| | - Tetsuya Kajimoto
- Medicinal Organic Chemistry Laboratory, College of Pharmaceutical Sciences, Ritsumeikan University
| | - Hiroki Iwasaki
- Department of Pharmaceutical Manufacturing Chemistry, Kyoto Pharmaceutical University
| | - Naoto Kojima
- Department of Pharmaceutical Manufacturing Chemistry, Kyoto Pharmaceutical University
| | - Kenji Arimitsu
- Department of Pharmaceutical Manufacturing Chemistry, Kyoto Pharmaceutical University
| | - Shinzo Hosoi
- Department of Pharmaceutical Manufacturing Chemistry, Kyoto Pharmaceutical University
| | - Manabu Node
- Department of Pharmaceutical Manufacturing Chemistry, Kyoto Pharmaceutical University
| | - Masayuki Yamashita
- Department of Pharmaceutical Manufacturing Chemistry, Kyoto Pharmaceutical University
| | - Ikuo Kawasaki
- Department of Medicinal and Synthetic Chemistry, Faculty of Pharmaceutical Sciences, Mukogawa Women's University
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57
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Bhangare DN, Shinde RG, Pawar PD, Nikalje MD, Lokhande MN. Catalytic Sc(
OTf
)
3
mediated direct asymmetric aldol reaction of (−)‐menthyl isothiocyanatoacetate with aldehydes by using (−)‐menthol as chiral auxiliary. J Heterocycl Chem 2021. [DOI: 10.1002/jhet.4286] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Dattatraya N. Bhangare
- Department of Chemistry Savitribai Phule Pune University Pune India
- Department of Chemistry Government of Maharashtra's Ismail Yusuf College Jogeshwari(E) Mumbai India
| | - Rohit G. Shinde
- Department of Chemistry Savitribai Phule Pune University Pune India
| | | | | | - Mahendra N. Lokhande
- Department of Chemistry Avvaiyar Government College for Women Karaikal Puducherry (U.T.) India
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58
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Iwan D, Kamińska K, Wojaczyńska E. Application of Polyamines and Amino Acid Derivatives Based on 2-Azabicycloalkane Backbone in Enantioselective Aldol Reaction. Molecules 2021; 26:molecules26175166. [PMID: 34500600 PMCID: PMC8434137 DOI: 10.3390/molecules26175166] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2021] [Accepted: 08/23/2021] [Indexed: 11/29/2022] Open
Abstract
Carbon–carbon bond forming reactions, such as aldol reaction and condensation, belong to extremely desired transformations as manifested by >25,000 entries in SciFinder. Their stereoselective variant requires the use of an appropriate catalyst with a strictly defined structure. Hence, chiral 2-azabicycloalkane-based catalysts were designed, synthesized and tested in a stereoselective aldol reaction between cyclic/acyclic ketone and p-nitrobenzaldehyde both in organic and aqueous media. Among catalysts containing a chiral bicyclic backbone, amide based on 2-azabicyclo[3.2.1]octane and pyrrolidine units showed the best catalytic activity and afforded aldol product in excellent chemical yields (up to 95%) and good diastereo- and enantioselectivity (dr 22:78, ee up to 63%).
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59
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Chen H, Huang M, Yan W, Bai WJ, Wang X. Enzymatic Regio- and Enantioselective C–H Oxyfunctionalization of Fatty Acids. ACS Catal 2021. [DOI: 10.1021/acscatal.1c03292] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Hao Chen
- College of Bioscience and Biotechnology, Yangzhou University, Yangzhou, Jiangsu 225009, China
| | - Mengfei Huang
- College of Bioscience and Biotechnology, Yangzhou University, Yangzhou, Jiangsu 225009, China
| | - Wenliang Yan
- College of Bioscience and Biotechnology, Yangzhou University, Yangzhou, Jiangsu 225009, China
| | - Wen-Ju Bai
- Department of Chemistry, Stanford University, Stanford, California 94305, United States
| | - Xiqing Wang
- College of Bioscience and Biotechnology, Yangzhou University, Yangzhou, Jiangsu 225009, China
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60
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Shi YS, Liu JF, Wu XL, Ke DH, Xu S. Synthesis of (E)-α-hydroxyethyl-α,β-unsaturated aldehydes by the reaction of tetrahydrofuran and aromatic aldehydes. Tetrahedron Lett 2021. [DOI: 10.1016/j.tetlet.2021.153304] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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61
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Serenko Y, Yudin N, Gritcenko R, Rodin A, Belova E, Ponomarev A. Competitive processes of tributyl phosphate degradation in HNO3-saturated solution in Isopar-M during radiolysis and aging. Radiat Phys Chem Oxf Engl 1993 2021. [DOI: 10.1016/j.radphyschem.2021.109495] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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62
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Zhong H, Zhao B, Deng J. Chiral magnetic hybrid materials constructed from macromolecules and their chiral applications. NANOSCALE 2021; 13:11765-11780. [PMID: 34231630 DOI: 10.1039/d1nr01939b] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Chirality is a fundamental and ubiquitous feature of living organisms in nature. Magnetic materials, in particular magnetic nanoparticles (MNPs), show some interesting properties such as large specific surface area, easy surface modification, magnetic responsivity and separation ability. Integrating MNPs with chirality in a single material will undoubtedly create a large number of advanced multi-functional materials. Despite the great advancements made in this area, there have been no review articles to summarize the relevant studies. The present work reviews the major progress recently made in constructing chiral magnetic hybrid materials (CMHMs) using macromolecules, which are classified based on the primary chiral macromolecular organic components, namely, biological polymers and synthetic polymers, and the applications of the resulting chiral hybrids in chiral research fields, including asymmetric catalysis, enzymatic resolution, chromatographic separation, enantioselective crystallization and enantioselective adsorption, are also summarized. The challenges and prospects of related research fields are proposed in the last section.
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Affiliation(s)
- Hai Zhong
- State Key Laboratory of Chemical Resource Engineering and College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China
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63
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Chiral Imidazolium Prolinate Salts as Efficient Synzymatic Organocatalysts for the Asymmetric Aldol Reaction. Molecules 2021; 26:molecules26144190. [PMID: 34299464 PMCID: PMC8303523 DOI: 10.3390/molecules26144190] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2021] [Revised: 06/30/2021] [Accepted: 07/07/2021] [Indexed: 11/20/2022] Open
Abstract
Chiral imidazolium l-prolinate salts, providing a complex network of supramolecular interaction in a chiral environment, have been studied as synzymatic catalytic systems. They are demonstrated to be green and efficient chiral organocatalysts for direct asymmetric aldol reactions at room temperature. The corresponding aldol products were obtained with moderate to good enantioselectivities. The influence of the presence of chirality in both the imidazolium cation and the prolinate anion on the transfer of chirality from the organocatalyst to the aldol product has been studied. Moreover, interesting match/mismatch situations have been observed regarding configuration of chirality of the two components through the analysis of results for organocatalysts derived from both enantiomers of prolinate (R/S) and the trans/cis isomers for the chiral fragment of the cation. This is associated with differences in the corresponding reaction rates but also to the different tendencies for the formation of aggregates, as evidenced by nonlinear effects studies (NLE). Excellent activities, selectivities, and enantioselectivities could be achieved by an appropriate selection of the structural elements at the cation and anion.
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64
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Kennington SCD, Teloxa SF, Mellado-Hidalgo M, Galeote O, Puddu S, Bellido M, Romea P, Urpí F, Aullón G, Font-Bardia M. Direct and Enantioselective Aldol Reactions Catalyzed by Chiral Nickel(II) Complexes. Angew Chem Int Ed Engl 2021; 60:15307-15312. [PMID: 33872449 PMCID: PMC8362213 DOI: 10.1002/anie.202104352] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2021] [Revised: 04/12/2021] [Indexed: 01/07/2023]
Abstract
A direct and asymmetric aldol reaction of N‐acyl thiazinanethiones with aromatic aldehydes catalyzed by chiral nickel(II) complexes is reported. The reaction gives the corresponding O‐TIPS‐protected anti‐aldol adducts in high yields and with remarkable stereocontrol and atom economy. Furthermore, the straightforward removal of the achiral scaffold provides enantiomerically pure intermediates of synthetic interest, which involve precursors for anti‐α‐amino‐β‐hydroxy and α,β‐dihydroxy carboxylic derivatives. Theoretical calculations explain the observed high stereocontrol.
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Affiliation(s)
- Stuart C D Kennington
- Department of Inorganic and Organic Chemistry, Section of Organic Chemistry, Universitat de Barcelona, Carrer Martí i Franqués 1-11, 08028, Barcelona, Spain
| | - Saul F Teloxa
- Department of Inorganic and Organic Chemistry, Section of Organic Chemistry, Universitat de Barcelona, Carrer Martí i Franqués 1-11, 08028, Barcelona, Spain
| | - Miguel Mellado-Hidalgo
- Department of Inorganic and Organic Chemistry, Section of Organic Chemistry, Universitat de Barcelona, Carrer Martí i Franqués 1-11, 08028, Barcelona, Spain
| | - Oriol Galeote
- Department of Inorganic and Organic Chemistry, Section of Organic Chemistry, Universitat de Barcelona, Carrer Martí i Franqués 1-11, 08028, Barcelona, Spain
| | - Sabrina Puddu
- Department of Inorganic and Organic Chemistry, Section of Organic Chemistry, Universitat de Barcelona, Carrer Martí i Franqués 1-11, 08028, Barcelona, Spain
| | - Marina Bellido
- Department of Inorganic and Organic Chemistry, Section of Organic Chemistry, Universitat de Barcelona, Carrer Martí i Franqués 1-11, 08028, Barcelona, Spain
| | - Pedro Romea
- Department of Inorganic and Organic Chemistry, Section of Organic Chemistry, Universitat de Barcelona, Carrer Martí i Franqués 1-11, 08028, Barcelona, Spain
| | - Fèlix Urpí
- Department of Inorganic and Organic Chemistry, Section of Organic Chemistry, Universitat de Barcelona, Carrer Martí i Franqués 1-11, 08028, Barcelona, Spain
| | - Gabriel Aullón
- Department of Inorganic and Organic Chemistry, Section of Inorganic Chemistry, Universitat de Barcelona, Carrer Martí i Franqués 1-11, 08028, Barcelona, Spain
| | - Mercè Font-Bardia
- X-ray Diffraction Unity, CCiTUB, Universitat de Barcelona, Carrer Solé i Sabarís 1-3, 08028, Barcelona, Spain
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65
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Vlasov S, Ponomarev A. Signs of keto-enol tautomerism in acetone radiolysis. Radiat Phys Chem Oxf Engl 1993 2021. [DOI: 10.1016/j.radphyschem.2021.109460] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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66
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Kim S, Kumari N, Lim J, Dubbu S, Kumar A, Lee IS. Silica Jar‐with‐Lid as Chemo‐Enzymatic Nano‐Compartment for Enantioselective Synthesis inside Living Cells. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202103165] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Seonock Kim
- Center for Nanospace-confined Chemical Reactions (NCCR) and Department of Chemistry Pohang University of Science and Technology (POSTECH) Pohang 37673 South Korea
| | - Nitee Kumari
- Center for Nanospace-confined Chemical Reactions (NCCR) and Department of Chemistry Pohang University of Science and Technology (POSTECH) Pohang 37673 South Korea
| | - Jongwon Lim
- Center for Nanospace-confined Chemical Reactions (NCCR) and Department of Chemistry Pohang University of Science and Technology (POSTECH) Pohang 37673 South Korea
| | - Sateesh Dubbu
- Center for Nanospace-confined Chemical Reactions (NCCR) and Department of Chemistry Pohang University of Science and Technology (POSTECH) Pohang 37673 South Korea
| | - Amit Kumar
- Center for Nanospace-confined Chemical Reactions (NCCR) and Department of Chemistry Pohang University of Science and Technology (POSTECH) Pohang 37673 South Korea
| | - In Su Lee
- Center for Nanospace-confined Chemical Reactions (NCCR) and Department of Chemistry Pohang University of Science and Technology (POSTECH) Pohang 37673 South Korea
- Institute for Convergence Research and Education in Advanced Technology (I-CREATE) Yonsei University Seoul 03722 South Korea
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67
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Kim S, Kumari N, Lim J, Dubbu S, Kumar A, Lee IS. Silica Jar-with-Lid as Chemo-Enzymatic Nano-Compartment for Enantioselective Synthesis inside Living Cells. Angew Chem Int Ed Engl 2021; 60:16337-16342. [PMID: 34041834 DOI: 10.1002/anie.202103165] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2021] [Revised: 04/27/2021] [Indexed: 12/17/2022]
Abstract
Nanodevices, harvesting the power of synthetic catalysts and enzymes to perform enantioselective synthesis inside cell, have never been reported. Here, we synthesized round bottom jar-like silica nanostructures (SiJARs) with a chemo-responsive metal-silicate lid. This was isolated as an intermediate structure during highly controlled solid-state nanocrystal-conversion at the arc-section of silica shell. Different catalytic noble metals (Pt, Pd, Ru) were selectively modified on the lid-section through galvanic reactions. And, lid aperture-opening was regulated by mild acidic conditions or intracellular environment which accommodated the metal nanocrystals and enzymes, and in turn created an open-mouth nanoreactor. Distinct from the free enzymes, SiJARs performed asymmetric aldol reactions with high activity and enantioselectivity (yield >99 %, ee=95 %) and also functioned as the artificial catalytic organelles inside living cells. This work bridges the enormous potential of sophisticated nanocrystal-conversion chemistry and advanced platforms for new-to-nature catalysis.
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Affiliation(s)
- Seonock Kim
- Center for Nanospace-confined Chemical Reactions (NCCR) and Department of Chemistry, Pohang University of Science and Technology (POSTECH), Pohang, 37673, South Korea
| | - Nitee Kumari
- Center for Nanospace-confined Chemical Reactions (NCCR) and Department of Chemistry, Pohang University of Science and Technology (POSTECH), Pohang, 37673, South Korea
| | - Jongwon Lim
- Center for Nanospace-confined Chemical Reactions (NCCR) and Department of Chemistry, Pohang University of Science and Technology (POSTECH), Pohang, 37673, South Korea
| | - Sateesh Dubbu
- Center for Nanospace-confined Chemical Reactions (NCCR) and Department of Chemistry, Pohang University of Science and Technology (POSTECH), Pohang, 37673, South Korea
| | - Amit Kumar
- Center for Nanospace-confined Chemical Reactions (NCCR) and Department of Chemistry, Pohang University of Science and Technology (POSTECH), Pohang, 37673, South Korea
| | - In Su Lee
- Center for Nanospace-confined Chemical Reactions (NCCR) and Department of Chemistry, Pohang University of Science and Technology (POSTECH), Pohang, 37673, South Korea.,Institute for Convergence Research and Education in Advanced Technology (I-CREATE), Yonsei University, Seoul, 03722, South Korea
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68
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Kennington SCD, Teloxa SF, Mellado‐Hidalgo M, Galeote O, Puddu S, Bellido M, Romea P, Urpí F, Aullón G, Font‐Bardia M. Direct and Enantioselective Aldol Reactions Catalyzed by Chiral Nickel(II) Complexes. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202104352] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- Stuart C. D. Kennington
- Department of Inorganic and Organic Chemistry Section of Organic Chemistry Universitat de Barcelona Carrer Martí i Franqués 1–11 08028 Barcelona Spain
| | - Saul F. Teloxa
- Department of Inorganic and Organic Chemistry Section of Organic Chemistry Universitat de Barcelona Carrer Martí i Franqués 1–11 08028 Barcelona Spain
| | - Miguel Mellado‐Hidalgo
- Department of Inorganic and Organic Chemistry Section of Organic Chemistry Universitat de Barcelona Carrer Martí i Franqués 1–11 08028 Barcelona Spain
| | - Oriol Galeote
- Department of Inorganic and Organic Chemistry Section of Organic Chemistry Universitat de Barcelona Carrer Martí i Franqués 1–11 08028 Barcelona Spain
| | - Sabrina Puddu
- Department of Inorganic and Organic Chemistry Section of Organic Chemistry Universitat de Barcelona Carrer Martí i Franqués 1–11 08028 Barcelona Spain
| | - Marina Bellido
- Department of Inorganic and Organic Chemistry Section of Organic Chemistry Universitat de Barcelona Carrer Martí i Franqués 1–11 08028 Barcelona Spain
| | - Pedro Romea
- Department of Inorganic and Organic Chemistry Section of Organic Chemistry Universitat de Barcelona Carrer Martí i Franqués 1–11 08028 Barcelona Spain
| | - Fèlix Urpí
- Department of Inorganic and Organic Chemistry Section of Organic Chemistry Universitat de Barcelona Carrer Martí i Franqués 1–11 08028 Barcelona Spain
| | - Gabriel Aullón
- Department of Inorganic and Organic Chemistry Section of Inorganic Chemistry Universitat de Barcelona Carrer Martí i Franqués 1–11 08028 Barcelona Spain
| | - Mercè Font‐Bardia
- X-ray Diffraction Unity CCiTUB Universitat de Barcelona Carrer Solé i Sabarís 1–3 08028 Barcelona Spain
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69
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Nugent TC, Goswami F, Debnath S, Hussain I, Ali El Damrany Hussein H, Karn A, Nakka S. Harnessing Additional Capability from in Water Reaction Conditions: Aldol
versus
Knoevenagel Chemoselectivity. Adv Synth Catal 2021. [DOI: 10.1002/adsc.202100301] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Thomas C. Nugent
- Department of Life Sciences and Chemistry Jacobs University Bremen 28759 Bremen Germany
| | - Falguni Goswami
- Department of Life Sciences and Chemistry Jacobs University Bremen 28759 Bremen Germany
| | - Samarpita Debnath
- Department of Life Sciences and Chemistry Jacobs University Bremen 28759 Bremen Germany
| | - Ishtiaq Hussain
- Department of Pharmacy Abbottabad University of Science and Technology Havelian Abbottabad 22010 Pakistan
| | | | - Alka Karn
- Department of Life Sciences and Chemistry Jacobs University Bremen 28759 Bremen Germany
| | - Srinuvasu Nakka
- Department of Life Sciences and Chemistry Jacobs University Bremen 28759 Bremen Germany
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70
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Mata G, Kalnmals CA. Total Synthesis in the Trost Laboratories: Selected Milestones From the Past Twenty Years. Isr J Chem 2021. [DOI: 10.1002/ijch.202100022] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Guillaume Mata
- Arcus Biosciences, Inc. 3928 Point Eden Way Hayward CA 94545 USA
| | - Christopher A. Kalnmals
- Crop Protection Discovery Corteva Agriscience 9330 Zionsville Road Indianapolis IN 46268 USA
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71
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Santana CG, Krische MJ. From Hydrogenation to Transfer Hydrogenation to Hydrogen Auto-Transfer in Enantioselective Metal-Catalyzed Carbonyl Reductive Coupling: Past, Present, and Future. ACS Catal 2021; 11:5572-5585. [PMID: 34306816 PMCID: PMC8302072 DOI: 10.1021/acscatal.1c01109] [Citation(s) in RCA: 60] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Atom-efficient processes that occur via addition, redistribution or removal of hydrogen underlie many large volume industrial processes and pervade all segments of chemical industry. Although carbonyl addition is one of the oldest and most broadly utilized methods for C-C bond formation, the delivery of non-stabilized carbanions to carbonyl compounds has relied on premetalated reagents or metallic/organometallic reductants, which pose issues of safety and challenges vis-à-vis large volume implementation. Catalytic carbonyl reductive couplings promoted via hydrogenation, transfer hydrogenation and hydrogen auto-transfer allow abundant unsaturated hydrocarbons to serve as substitutes to organometallic reagents, enabling C-C bond formation in the absence of stoichiometric metals. This perspective (a) highlights past milestones in catalytic hydrogenation, hydrogen transfer and hydrogen auto-transfer, (b) summarizes current methods for catalytic enantioselective carbonyl reductive couplings, and (c) describes future opportunities based on the patterns of reactivity that animate transformations of this type.
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Affiliation(s)
| | - Michael J Krische
- University of Texas at Austin, Department of Chemistry, Austin, TX 78712, USA
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72
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Zhao Q, Wang G, Liao F, Sha Y, Xu F, Li C, Li Z, Cao Y. Ionic liquid catalyzed solvent-free synthesis of chalcone and its derivatives under mild conditions. Chin J Chem Eng 2021. [DOI: 10.1016/j.cjche.2020.09.013] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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73
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Juaristi E. Recent developments in next generation (S)-proline-derived chiral organocatalysts. Tetrahedron 2021. [DOI: 10.1016/j.tet.2021.132143] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
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74
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Bin HY, Cheng L, Wu X, Zhu CL, Yang XH, Xie JH, Zhou QL. Asymmetric hydrogenation of exocyclic γ,δ-unsaturated β-ketoesters to functionalized chiral allylic alcohols via dynamic kinetic resolution. Chem Sci 2021; 12:7793-7799. [PMID: 34168833 PMCID: PMC8188505 DOI: 10.1039/d1sc02044g] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2021] [Accepted: 04/28/2021] [Indexed: 12/15/2022] Open
Abstract
An iridium catalyzed asymmetric hydrogenation of racemic exocyclic γ,δ-unsaturated β-ketoesters via dynamic kinetic resolution to functionalized chiral allylic alcohols was developed. With the chiral spiro iridium catalysts Ir-SpiroPAP, a series of racemic exocyclic γ,δ-unsaturated β-ketoesters bearing a five-, six-, or seven-membered ring were hydrogenated to the corresponding functionalized chiral allylic alcohols in high yields with good to excellent enantioselectivities (87 to >99% ee) and cis-selectivities (93 : 7 to >99 : 1). The origin of the excellent stereoselectivity was also rationalized by density functional theory calculations. Furthermore, this protocol could be performed on gram scale and at a lower catalyst loading (0.002 mol%) without the loss of reactivity and enantioselectivity, and has been successfully applied in the enantioselective synthesis of chiral carbocyclic δ-amino esters and the β-galactosidase inhibitor isogalactofagomine.
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Affiliation(s)
- Huai-Yu Bin
- State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University Tianjin 300071 China
| | - Li Cheng
- State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University Tianjin 300071 China
| | - Xiong Wu
- State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University Tianjin 300071 China
| | - Chang-Liang Zhu
- State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University Tianjin 300071 China
| | - Xiao-Hui Yang
- Advanced Research Institute of Multidisciplinary Science, School of Chemistry and Chemical Engineering, Beijing Institute of Technology Beijing 100081 China
| | - Jian-Hua Xie
- State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University Tianjin 300071 China
| | - Qi-Lin Zhou
- State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University Tianjin 300071 China
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75
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Shimizu M, Higashino A, Mizota I, Zhu Y. N-Alkylation/aldol reaction of α-aldimino thioesters: a facile three-component coupling reaction. RSC Adv 2021; 11:13097-13104. [PMID: 35423863 PMCID: PMC8697212 DOI: 10.1039/d1ra02000e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2021] [Accepted: 03/31/2021] [Indexed: 11/29/2022] Open
Abstract
Theoretical calculation of the reactivity of α-imino thioesters indicates that they are very reactive substrates for Umpolung N-alkylation. In fact, treatment of α-aldimino thioesters with dialkylzinc reagents in the presence of aldehydes or imines gives three-component coupling products in good yields.
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Affiliation(s)
- Makoto Shimizu
- School of Energy Science and Engineering, Nanjing Tech University Nanjing 211816 Jiangsu Province China
- Department of Chemistry for Materials, Graduate School of Engineering, Mie University Tsu Mie 514-8507 Japan
| | - Asako Higashino
- Department of Chemistry for Materials, Graduate School of Engineering, Mie University Tsu Mie 514-8507 Japan
| | - Isao Mizota
- Department of Chemistry for Materials, Graduate School of Engineering, Mie University Tsu Mie 514-8507 Japan
| | - Yusong Zhu
- School of Energy Science and Engineering, Nanjing Tech University Nanjing 211816 Jiangsu Province China
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76
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Affiliation(s)
- Lona Dutta
- Organic Synthesis and Catalysis Lab Department of Chemical Sciences Indian Institute of Science Education and Research (IISER) Mohali Knowledge City, Sector 81, S. A. S. Nagar Manauli PO Punjab 140306 India
| | - Atanu Mondal
- Organic Synthesis and Catalysis Lab Department of Chemical Sciences Indian Institute of Science Education and Research (IISER) Mohali Knowledge City, Sector 81, S. A. S. Nagar Manauli PO Punjab 140306 India
| | - S. S. V. Ramasastry
- Organic Synthesis and Catalysis Lab Department of Chemical Sciences Indian Institute of Science Education and Research (IISER) Mohali Knowledge City, Sector 81, S. A. S. Nagar Manauli PO Punjab 140306 India
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77
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Zhao B, Yang S, Deng J, Pan K. Chiral Graphene Hybrid Materials: Structures, Properties, and Chiral Applications. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2021; 8:2003681. [PMID: 33854894 PMCID: PMC8025009 DOI: 10.1002/advs.202003681] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/26/2020] [Revised: 11/14/2020] [Indexed: 05/02/2023]
Abstract
Chirality has become an important research subject. The research areas associated with chirality are under substantial development. Meanwhile, graphene is a rapidly growing star material and has hard-wired into diverse disciplines. Rational combination of graphene and chirality undoubtedly creates unprecedented functional materials and may also lead to great findings. This hypothesis has been clearly justified by the sizable number of studies. Unfortunately, there has not been any previous review paper summarizing the scattered studies and advancements on this topic so far. This overview paper attempts to review the progress made in chiral materials developed from graphene and their derivatives, with the hope of providing a systemic knowledge about the construction of chiral graphenes and chiral applications thereof. Recently emerging directions, existing challenges, and future perspectives are also presented. It is hoped this paper will arouse more interest and promote further faster progress in these significant research areas.
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Affiliation(s)
- Biao Zhao
- State Key Laboratory of Chemical Resource EngineeringBeijing University of Chemical TechnologyBeijing100029China
- College of Materials Science and EngineeringBeijing University of Chemical TechnologyBeijing100029China
| | - Shenghua Yang
- State Key Laboratory of Chemical Resource EngineeringBeijing University of Chemical TechnologyBeijing100029China
- College of Materials Science and EngineeringBeijing University of Chemical TechnologyBeijing100029China
| | - Jianping Deng
- State Key Laboratory of Chemical Resource EngineeringBeijing University of Chemical TechnologyBeijing100029China
- College of Materials Science and EngineeringBeijing University of Chemical TechnologyBeijing100029China
| | - Kai Pan
- College of Materials Science and EngineeringBeijing University of Chemical TechnologyBeijing100029China
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78
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Abstract
The aldol reaction which is the most important one among the C-C bond forming reactions,
is widely used by synthetic organic chemists to obtain β-hydroxycarbonyl compounds which are important
starting components for biologically active compounds in optically pure form. In this research,
five Pro-Phe derivatives were synthesized by simple amidation reactions and characterized by their
spectral data. Their catalytic activities in asymmetric aldol reaction were investigated. The catalytic
activity studies were performed with aliphatic ketones and various aromatic aldehydes. Especially, (S)-
methyl 3-mercapto-2-((S)-3-phenyl-2-((S)-pyrrolidine-2-carboxamido)propanamido)propanoate showed
good catalytic activities in water at 0oC in the presence of p-nitrobenzoic acid cocatalyst. The enantioselectivities
were up to 90.4%, the diastereomeric ratios were up to 97/3 and yields were 99%. The
results showed that these organocatalysts were promising organocatalysts for aldol reaction. Besides,
this catalyst showed its best catalytic activities in water which is also an important contribution to
green chemistry requirements.
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Affiliation(s)
- Merve Karaoglu
- Department of Chemistry, Yildiz Technical University, Davutpasa Campus, 34010 Esenler, Istanbul,Turkey
| | - Feray Aydogan
- Department of Chemistry, Yildiz Technical University, Davutpasa Campus, 34010 Esenler, Istanbul,Turkey
| | - Cigdem Yolacan
- Department of Chemistry, Yildiz Technical University, Davutpasa Campus, 34010 Esenler, Istanbul,Turkey
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79
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Direct Catalytic Asymmetric Synthesis of Disubstituted 4-Oxocyclohexanecarbaldehydes from Acetone and Cinnamaldehyde Derivatives. Org Lett 2021; 23:1566-1571. [DOI: 10.1021/acs.orglett.0c04277] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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80
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Tracy JS, Kalnmals CA, Toste FD. Beyond Allylic Alkylation: Applications of Trost Chemistry in Complex Molecule Synthesis. Isr J Chem 2021. [DOI: 10.1002/ijch.202000103] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Jacob S. Tracy
- Dept. of Chemistry University of California, Berkeley MC 1460 Berkeley CA 94720 USA
| | | | - F. Dean Toste
- Dept. of Chemistry University of California, Berkeley MC 1460 Berkeley CA 94720 USA
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81
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Eymur S, TaŞci E, Uyanik A, Yilmaz M. L-proline/cholesterol and diosgenin based thiourea cooperative system for the direct asymmetric aldol reaction in the presence of water. Turk J Chem 2021; 44:1278-1284. [PMID: 33488228 PMCID: PMC7751905 DOI: 10.3906/kim-2003-36] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2020] [Accepted: 07/01/2020] [Indexed: 11/22/2022] Open
Abstract
A series of cholesterol and based hydrophobic urea and thiourea compounds were synthesized and successfully used as a cocatalyst for L-proline catalyzed aldol reactions in the presence of water. The anticonfigured products were obtained with good yields (up to 94%), high diastereoselectivities (up to 95:5), and high enantiomeric excesses (up to 93%
ee
). The successful results for catalytic efficiency of L-proline in the presence of water reveal the importance of the hydrophobic nature of cholesterol and diosgenin parts of thiourea on the reactivity and selectivity in the presence of water.
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Affiliation(s)
- Serkan Eymur
- Department of Energy Systems Engineering, Faculty of Engineering, Giresun University, Giresun Turkey
| | - Enis TaŞci
- Vocational School of Health Services, Giresun University, Giresun Turkey
| | - Arzu Uyanik
- Department of Chemistry, Faculty of Science, Selçuk University, Konya Turkey
| | - Mustafa Yilmaz
- Department of Chemistry, Faculty of Science, Selçuk University, Konya Turkey
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82
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Yang X, Majhi PK, Chai H, Liu B, Sun J, Liu T, Liu Y, Zhou L, Xu J, Liu J, Wang D, Zhao Y, Jin Z, Chi YR. Carbene-Catalyzed Enantioselective Aldol Reaction: Post-Aldol Stereochemistry Control and Formation of Quaternary Stereogenic Centers. Angew Chem Int Ed Engl 2021; 60:159-165. [PMID: 32931603 DOI: 10.1002/anie.202008369] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2020] [Revised: 07/28/2020] [Indexed: 12/13/2022]
Abstract
The dominated approaches for asymmetric aldol reactions have primarily focused on the aldol carbon-carbon bond-forming events. Here we postulate and develop a new catalytic strategy that seeks to modulate the reaction thermodynamics and control the product enantioselectivities via post-aldol processes. Specifically, an NHC catalyst is used to activate a masked enolate substrate (vinyl carbonate) to promote the aldol reaction in a non-enantioselective manner. This reversible aldol event is subsequently followed by an enantioselective acylative kinetic resolution that is mediated by the same (chiral) NHC catalyst without introducing any additional substance. This post-aldol process takes care of the enantioselectivity issues and drives the otherwise reversible aldol reaction toward a complete conversion. The acylated aldol products bearing quaternary/tetrasubstituted carbon stereogenic centers are formed in good yields and high optical purities.
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Affiliation(s)
- Xing Yang
- Division of Chemistry & Mathematical Science, School of Physical & Mathematical Sciences, Nanyang Technological University, Singapore, 637371, Singapore
| | - Pankaj Kumar Majhi
- Division of Chemistry & Mathematical Science, School of Physical & Mathematical Sciences, Nanyang Technological University, Singapore, 637371, Singapore
| | - Huifang Chai
- Guizhou University of Traditional Chinese Medicine, Guiyang, 550025, China
| | - Bin Liu
- Laboratory Breeding Base of Green Pesticide and Agricultural Bioengineering, Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Guizhou University, Huaxi District, Guiyang, 550025, China
| | - Jun Sun
- Laboratory Breeding Base of Green Pesticide and Agricultural Bioengineering, Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Guizhou University, Huaxi District, Guiyang, 550025, China
| | - Ting Liu
- Laboratory Breeding Base of Green Pesticide and Agricultural Bioengineering, Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Guizhou University, Huaxi District, Guiyang, 550025, China
| | - Yonggui Liu
- Laboratory Breeding Base of Green Pesticide and Agricultural Bioengineering, Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Guizhou University, Huaxi District, Guiyang, 550025, China
| | - Liejin Zhou
- Division of Chemistry & Mathematical Science, School of Physical & Mathematical Sciences, Nanyang Technological University, Singapore, 637371, Singapore
| | - Jun Xu
- Guizhou University of Traditional Chinese Medicine, Guiyang, 550025, China
| | - Jiawei Liu
- Division of Chemistry & Mathematical Science, School of Physical & Mathematical Sciences, Nanyang Technological University, Singapore, 637371, Singapore
| | - Dongdong Wang
- Division of Chemistry & Mathematical Science, School of Physical & Mathematical Sciences, Nanyang Technological University, Singapore, 637371, Singapore
| | - Yanli Zhao
- Division of Chemistry & Mathematical Science, School of Physical & Mathematical Sciences, Nanyang Technological University, Singapore, 637371, Singapore
| | - Zhichao Jin
- Laboratory Breeding Base of Green Pesticide and Agricultural Bioengineering, Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Guizhou University, Huaxi District, Guiyang, 550025, China
| | - Yonggui Robin Chi
- Division of Chemistry & Mathematical Science, School of Physical & Mathematical Sciences, Nanyang Technological University, Singapore, 637371, Singapore.,Laboratory Breeding Base of Green Pesticide and Agricultural Bioengineering, Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Guizhou University, Huaxi District, Guiyang, 550025, China
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83
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Yang X, Majhi PK, Chai H, Liu B, Sun J, Liu T, Liu Y, Zhou L, Xu J, Liu J, Wang D, Zhao Y, Jin Z, Chi YR. Carbene‐Catalyzed Enantioselective Aldol Reaction: Post‐Aldol Stereochemistry Control and Formation of Quaternary Stereogenic Centers. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202008369] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Xing Yang
- Division of Chemistry & Mathematical Science School of Physical & Mathematical Sciences Nanyang Technological University Singapore 637371 Singapore
| | - Pankaj Kumar Majhi
- Division of Chemistry & Mathematical Science School of Physical & Mathematical Sciences Nanyang Technological University Singapore 637371 Singapore
| | - Huifang Chai
- Guizhou University of Traditional Chinese Medicine Guiyang 550025 China
| | - Bin Liu
- Laboratory Breeding Base of Green Pesticide and Agricultural Bioengineering Key Laboratory of Green Pesticide and Agricultural Bioengineering Ministry of Education Guizhou University Huaxi District Guiyang 550025 China
| | - Jun Sun
- Laboratory Breeding Base of Green Pesticide and Agricultural Bioengineering Key Laboratory of Green Pesticide and Agricultural Bioengineering Ministry of Education Guizhou University Huaxi District Guiyang 550025 China
| | - Ting Liu
- Laboratory Breeding Base of Green Pesticide and Agricultural Bioengineering Key Laboratory of Green Pesticide and Agricultural Bioengineering Ministry of Education Guizhou University Huaxi District Guiyang 550025 China
| | - Yonggui Liu
- Laboratory Breeding Base of Green Pesticide and Agricultural Bioengineering Key Laboratory of Green Pesticide and Agricultural Bioengineering Ministry of Education Guizhou University Huaxi District Guiyang 550025 China
| | - Liejin Zhou
- Division of Chemistry & Mathematical Science School of Physical & Mathematical Sciences Nanyang Technological University Singapore 637371 Singapore
| | - Jun Xu
- Guizhou University of Traditional Chinese Medicine Guiyang 550025 China
| | - Jiawei Liu
- Division of Chemistry & Mathematical Science School of Physical & Mathematical Sciences Nanyang Technological University Singapore 637371 Singapore
| | - Dongdong Wang
- Division of Chemistry & Mathematical Science School of Physical & Mathematical Sciences Nanyang Technological University Singapore 637371 Singapore
| | - Yanli Zhao
- Division of Chemistry & Mathematical Science School of Physical & Mathematical Sciences Nanyang Technological University Singapore 637371 Singapore
| | - Zhichao Jin
- Laboratory Breeding Base of Green Pesticide and Agricultural Bioengineering Key Laboratory of Green Pesticide and Agricultural Bioengineering Ministry of Education Guizhou University Huaxi District Guiyang 550025 China
| | - Yonggui Robin Chi
- Division of Chemistry & Mathematical Science School of Physical & Mathematical Sciences Nanyang Technological University Singapore 637371 Singapore
- Laboratory Breeding Base of Green Pesticide and Agricultural Bioengineering Key Laboratory of Green Pesticide and Agricultural Bioengineering Ministry of Education Guizhou University Huaxi District Guiyang 550025 China
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84
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Laldinpuii ZT, Lalmuanpuia C, Lalhmangaihzuala S, Khiangte V, Pachuau Z, Vanlaldinpuia K. Biomass waste-derived recyclable heterogeneous catalyst for aqueous aldol reaction and depolymerization of PET waste. NEW J CHEM 2021. [DOI: 10.1039/d1nj03225a] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Eco-friendly biomass waste-derived recyclable heterogeneous catalyst for aldol reaction in water and for methanolysis of PET waste.
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Affiliation(s)
- Z. T. Laldinpuii
- Department of Chemistry, Mizoram University, Pachhunga University College Campus, Aizawl, Mizoram 796001, India
- Department of Chemistry, Mizoram University, Aizawl, Mizoram 796004, India
| | - Chhakchhuak Lalmuanpuia
- Department of Chemistry, Mizoram University, Pachhunga University College Campus, Aizawl, Mizoram 796001, India
- Department of Chemistry, Mizoram University, Aizawl, Mizoram 796004, India
| | - Samson Lalhmangaihzuala
- Department of Chemistry, Mizoram University, Pachhunga University College Campus, Aizawl, Mizoram 796001, India
- Department of Chemistry, Mizoram University, Aizawl, Mizoram 796004, India
| | - Vanlalngaihawma Khiangte
- Department of Chemistry, Mizoram University, Pachhunga University College Campus, Aizawl, Mizoram 796001, India
- Department of Chemistry, Mizoram University, Aizawl, Mizoram 796004, India
| | - Zodinpuia Pachuau
- Department of Chemistry, Mizoram University, Aizawl, Mizoram 796004, India
| | - Khiangte Vanlaldinpuia
- Department of Chemistry, Mizoram University, Pachhunga University College Campus, Aizawl, Mizoram 796001, India
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85
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Liu C, Li SJ, Han P, Qu LB, Lan Y. How to inverse the chemoselectivity of nucleophilic addition by using a Lewis acid/Brønsted base pair catalyst: A theoretical view. MOLECULAR CATALYSIS 2021. [DOI: 10.1016/j.mcat.2020.111318] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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86
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Peme T, Brady D, Juma W, Makatini M. Development of fructose-1,6-bisphosphate aldolase enzyme peptide mimics as biocatalysts in direct asymmetric aldol reactions. RSC Adv 2021; 11:36670-36681. [PMID: 35494350 PMCID: PMC9043830 DOI: 10.1039/d1ra06616a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2021] [Accepted: 11/07/2021] [Indexed: 11/21/2022] Open
Abstract
This study describes the design and synthesis of mimetic peptides modelled on the catalytic active site of the fructose-1,6-bisphosphate aldolase (FBPA) enzyme. The synthesized peptides consisting of the turn motifs and catalytic site amino acids of FBPA enzyme were evaluated for catalytic activity in direct asymmetric aldol reactions of ketones and aldehydes. The influence of substrate scope, catalyst loading and solvents including water, on the reaction were also investigated. Nuclear magnetic resonance (NMR) and circular dichroism (CD) were used to determine the secondary structure of the peptides to provide an understanding of the structure–activity relationship. The peptides showed catalytic activity and the aldol products were obtained in low yields (up to 44%), but excellent enantioselectivity (up to 93%) and moderate diastereoselectivity (65 : 35). Novel asymmetric aldol reaction catalysing fructose-1,6-bisphosphate aldolase peptide mimics with secondary structural motifs.![]()
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Affiliation(s)
- Thabo Peme
- Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand, Private Bag 3, PO WITS, 2050, South Africa
| | - Dean Brady
- Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand, Private Bag 3, PO WITS, 2050, South Africa
| | - Wanyama Juma
- Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand, Private Bag 3, PO WITS, 2050, South Africa
| | - Maya Makatini
- Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand, Private Bag 3, PO WITS, 2050, South Africa
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87
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Trost BM, Zhu C. Zn-ProPhenol Catalyzed Enantioselective Mannich Reaction of 2 H-Azirines with Alkynyl Ketones. Org Lett 2020; 22:9683-9687. [PMID: 33269592 DOI: 10.1021/acs.orglett.0c03737] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
The enantioselective Mannich reaction of 2H-azirines with alkynyl ketones is achieved under Zn-ProPhenol catalysis, delivering various aziridines with vicinal tetrasubstituted stereocenters in high yields with excellent enantioselectivities. The bimetallic Zn-ProPhenol complexes activate both the nucleophile and the electrophile in the same chiral pocket. A unique intramolecular hydrogen bond is observed in the obtained Mannich adducts, which lowers the basicity of the product's aziridine nitrogen thus favoring enantioselective control and allowing catalyst turnover.
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Affiliation(s)
- Barry M Trost
- Department of Chemistry, Stanford University, Stanford, California 94305-5080, United States
| | - Chuanle Zhu
- Department of Chemistry, Stanford University, Stanford, California 94305-5080, United States
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88
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Khangarot RK, Khandelwal M, Ray SK. Syntheses and Applications of Singh’s Catalyst. SYNTHESIS-STUTTGART 2020. [DOI: 10.1055/s-0040-1707235] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
Singh’s catalyst has emerged as one of the most promising and valuable catalysts in the field of asymmetric synthesis. Since its discovery, it has proven to be one of the best organocatalysts for asymmetric direct aldol reactions, and is equally efficient in aqueous and organic media. In this Short Review, we summarize reactions utilizing Singh’s catalyst under various conditions.1 Introduction2 Synthesis of Singh’s Catalyst3 Applications in Asymmetric Synthesis4 Conclusion
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Affiliation(s)
- Rama Kanwar Khangarot
- Department of Chemistry, University College of Science, Mohanlal Sukhadia University
| | - Manisha Khandelwal
- Department of Chemistry, University College of Science, Mohanlal Sukhadia University
| | - Sumit Kumar Ray
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal
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89
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Kotani S, Nakajima M. Asymmetric cross-Aldol Reactions between Two Carbonyl Compounds Catalyzed by Chiral Phosphine Oxides. J SYN ORG CHEM JPN 2020. [DOI: 10.5059/yukigoseikyokaishi.78.1163] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Shunsuke Kotani
- Graduate School of Pharmaceutical Sciences, Kumamoto University
| | - Makoto Nakajima
- Graduate School of Pharmaceutical Sciences, Kumamoto University
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90
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Ahmad SI, Ali G, Muhammad T, Ullah R, Umar MN, Hashmi AN. Synthetic β-hydroxy ketone derivative inhibits cholinesterases, rescues oxidative stress and ameliorates cognitive deficits in 5XFAD mice model of AD. Mol Biol Rep 2020; 47:9553-9566. [PMID: 33211296 DOI: 10.1007/s11033-020-05997-0] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2020] [Accepted: 11/11/2020] [Indexed: 12/31/2022]
Abstract
Alzheimer's disease (AD) is a progressive, chronic and age-related neurodegenerative disorder that affects millions of people across the world. In pursuit of new anti-AD remedies, 2-[Hydroxy-(4-nitrophenyl)methyl]-cyclopentanone (NMC), a β hydroxyl ketone derivative was studied to explore its neuroprotective potentials against AD. The in-vitro AChE and BuChE enzymes inhibition were evaluated by Ellman protocol and antioxidant potentials of NMC by DPPH free radical scavenging assay. In-vivo behavioral studies were performed in the transgenic 5xFAD mice model of AD using shallow water maze (SWM), Paddling Y-Maze (PYM), elevated plus maze (EPM) and balance beam (BB) tests. Also, the ex-vivo cholinesterase inhibitory effects of NMC and histopathological analysis of amyloid-β plaques were determined in the frontal cortex and hippocampal regions of the mice brain. NMC exhibited significant in vitro anti-cholinesterase enzyme potentials with an IC50 value of 67 μg/ml against AChE and 96 μg/ml against BuChE respectively. Interestingly, the activities of AChE and BuChE enzymes were also significantly lower in the cortex and hippocampus of NMC-treated groups. Also, in the DPPH assessment, NMC displayed substantial antioxidant properties with an IC50 value observed as 171 μg/ml. Moreover, histopathological analysis via thioflavin-s staining displayed significantly lower plaques depositions in the cortex and hippocampus region of NMC-treated mice groups. Furthermore, SWM, PYM, EPM, and BB behavioral analysis indicated that NMC enhanced spatial learning, memory consolidation and improved balance performance. Altogether, to the best of our knowledge, we believe that NMC may serve as a potential and promising anti-cholinesterase, antioxidant and neuroprotective agent against AD.
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Affiliation(s)
- Syed Ilyas Ahmad
- Department of Pharmacy, University of Peshawar, Peshawar, 25120, Pakistan
| | - Gowhar Ali
- Department of Pharmacy, University of Peshawar, Peshawar, 25120, Pakistan.
| | - Tahir Muhammad
- Department of Pharmacy, University of Peshawar, Peshawar, 25120, Pakistan.
- Campbell Family Mental Health Research Institute, Centre for Addiction and Mental Health, 620 University Ave, Toronto, ON, M5G 2C1, Canada.
- Institute of Medical Science, University of Toronto, Toronto, ON, Canada.
| | - Rahim Ullah
- Department of Pharmacy, University of Peshawar, Peshawar, 25120, Pakistan
| | | | - Aisha Nasir Hashmi
- Translational Genomics Laboratory, COMSATS University Islamabad, Park Road, Tarlai Kalan, Islamabad, 45600, Pakistan
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91
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Balaji PV, Li Z, Saito A, Kumagai N, Shibasaki M. Direct Catalytic Asymmetric Addition of α‐Fluoronitriles to Aldehydes. Chemistry 2020; 26:15524-15527. [DOI: 10.1002/chem.202004743] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2020] [Indexed: 01/24/2023]
Affiliation(s)
| | - Zhao Li
- Institute of Microbial Chemistry 3-14-23 Kamiosaki, Shinagawa-ku Tokyo 141-0021 Japan
| | - Akira Saito
- Institute of Microbial Chemistry 3-14-23 Kamiosaki, Shinagawa-ku Tokyo 141-0021 Japan
| | - Naoya Kumagai
- Institute of Microbial Chemistry 3-14-23 Kamiosaki, Shinagawa-ku Tokyo 141-0021 Japan
| | - Masakatsu Shibasaki
- Institute of Microbial Chemistry 3-14-23 Kamiosaki, Shinagawa-ku Tokyo 141-0021 Japan
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92
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Metrano AJ, Chinn AJ, Shugrue CR, Stone EA, Kim B, Miller SJ. Asymmetric Catalysis Mediated by Synthetic Peptides, Version 2.0: Expansion of Scope and Mechanisms. Chem Rev 2020; 120:11479-11615. [PMID: 32969640 PMCID: PMC8006536 DOI: 10.1021/acs.chemrev.0c00523] [Citation(s) in RCA: 98] [Impact Index Per Article: 24.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Low molecular weight synthetic peptides have been demonstrated to be effective catalysts for an increasingly wide array of asymmetric transformations. In many cases, these peptide-based catalysts have enabled novel multifunctional substrate activation modes and unprecedented selectivity manifolds. These features, along with their ease of preparation, modular and tunable structures, and often biomimetic attributes make peptides well-suited as chiral catalysts and of broad interest. Many examples of peptide-catalyzed asymmetric reactions have appeared in the literature since the last survey of this broad field in Chemical Reviews (Chem. Rev. 2007, 107, 5759-5812). The overarching goal of this new Review is to provide a comprehensive account of the numerous advances in the field. As a corollary to this goal, we survey the many different types of catalytic reactions, ranging from acylation to C-C bond formation, in which peptides have been successfully employed. In so doing, we devote significant discussion to the structural and mechanistic aspects of these reactions that are perhaps specific to peptide-based catalysts and their interactions with substrates and/or reagents.
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Affiliation(s)
- Anthony J. Metrano
- AstraZeneca Oncology R&D, 35 Gatehouse Dr., Waltham, MA 02451, United States
| | - Alex J. Chinn
- Department of Chemistry, Princeton University, Princeton, NJ 08544, United States
| | - Christopher R. Shugrue
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA 02139, United States
| | - Elizabeth A. Stone
- Department of Chemistry, Yale University, P.O. Box 208107, New Haven, CT 06520, United States
| | - Byoungmoo Kim
- Department of Chemistry, Clemson University, Clemson, SC 29634, United States
| | - Scott J. Miller
- Department of Chemistry, Yale University, P.O. Box 208107, New Haven, CT 06520, United States
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93
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Benda MC, France S. Chiral disulfonimides: a versatile template for asymmetric catalysis. Org Biomol Chem 2020; 18:7485-7513. [PMID: 32940322 DOI: 10.1039/d0ob01742f] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Since the emergence of pseudo-C2-symmetric chiral phosphoric acids (CPA), much work has been done to utilize these systems in stereoselective, organocatalytic processes. Despite the success in this field, reasonably basic substrates such as imines are often required to achieve appreciable activation. In order to access a wider variety of potential reaction partners, many related organocatalysts with enhanced Brønsted acidity have since been developed. Chiral disulfonimides (DSIs) have materialized as one such powerful class of organocatalysts and have been shown to expand the list of potential substrates to include aldehydes and ketones via Brønsted, Lewis, or bifunctional acid activation. This versatility renders DSIs amenable to an impressive scope of reaction types, typically with remarkable stereoselectivity induced by asymmetric counteranion-directed catalysis (ACDC). This review serves to provide a complete analysis of the successful applications, mechanistic insights, and unmet challenges exhibited to date in DSI-catalyzed and -assisted processes.
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Affiliation(s)
- Meghan C Benda
- School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332, USA.
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94
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Sánchez-Antonio O, Romero-Sedglach KA, Vázquez-Orta EC, Juaristi E. New Mesoporous Silica-Supported Organocatalysts Based on (2S)-(1,2,4-Triazol-3-yl)-Proline: Efficient, Reusable, and Heterogeneous Catalysts for the Asymmetric Aldol Reaction. Molecules 2020; 25:molecules25194532. [PMID: 33022926 PMCID: PMC7583865 DOI: 10.3390/molecules25194532] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2020] [Revised: 09/30/2020] [Accepted: 10/01/2020] [Indexed: 01/02/2023] Open
Abstract
Novel organocatalytic systems based on the recently developed (S)-proline derivative (2S)-[5-(benzylthio)-4-phenyl-(1,2,4-triazol)-3-yl]-pyrrolidine supported on mesoporous silica were prepared and their efficiency was assessed in the asymmetric aldol reaction. These materials were fully characterized by FT-IR, MS, XRD, and SEM microscopy, gathering relevant information regarding composition, morphology, and organocatalyst distribution in the doped silica. Careful optimization of the reaction conditions required for their application as catalysts in asymmetric aldol reactions between ketones and aldehydes afforded the anticipated aldol products with excellent yields and moderate diastereo- and enantioselectivities. The recommended experimental protocol is simple, fast, and efficient providing the enantioenriched aldol product, usually without the need of a special work-up or purification protocol. This approach constitutes a remarkable improvement in the field of heterogeneous (S)-proline-based organocatalysis; in particular, the solid-phase silica-bonded catalytic systems described herein allow for a substantial reduction in solvent usage. Furthermore, the supported system described here can be recovered, reactivated, and reused several times with limited loss in catalytic efficiency relative to freshly synthesized organocatalysts.
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Affiliation(s)
- Omar Sánchez-Antonio
- Departamento de Química, Centro de Investigación y de Estudios Avanzados, Avenida IPN # 2508, 07360 Ciudad de México, Mexico; (O.S.-A.); (K.A.R.-S.); (E.C.V.-O.)
| | - Kevin A. Romero-Sedglach
- Departamento de Química, Centro de Investigación y de Estudios Avanzados, Avenida IPN # 2508, 07360 Ciudad de México, Mexico; (O.S.-A.); (K.A.R.-S.); (E.C.V.-O.)
| | - Erika C. Vázquez-Orta
- Departamento de Química, Centro de Investigación y de Estudios Avanzados, Avenida IPN # 2508, 07360 Ciudad de México, Mexico; (O.S.-A.); (K.A.R.-S.); (E.C.V.-O.)
| | - Eusebio Juaristi
- Departamento de Química, Centro de Investigación y de Estudios Avanzados, Avenida IPN # 2508, 07360 Ciudad de México, Mexico; (O.S.-A.); (K.A.R.-S.); (E.C.V.-O.)
- El Colegio Nacional, Luis González Obregón # 23, Centro Histórico, 06020 Ciudad de México, Mexico
- Correspondence: or
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95
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Natural sesquiterpenoid oligomers: A chemical perspective. Eur J Med Chem 2020; 203:112622. [DOI: 10.1016/j.ejmech.2020.112622] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2020] [Revised: 05/17/2020] [Accepted: 06/23/2020] [Indexed: 01/21/2023]
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96
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Abstract
Formation of carbon-carbon bonds is central to synthetic chemistry. The aldol reaction provides the chemistry to fuse a nucleophilic enolate with an electrophilic aldehyde to form a new CC bond between two newly formed asymmetric centers. A major challenge in the reaction is steering the stereochemistry of the product. Aldolases are lyases that catalyze aldol reactions as well as the retro-aldol cleavage, and are abundant in cellular metabolism. Due to the often exquisite stereoselectivity in aldolase catalyzed carboligation reactions, these enzymes are gaining increased interest as potentially important tools in asymmetric synthesis of new useful compounds. Fructose 6-phosphate aldolase from Escherichia coli (FSA) is of special interest because of its very unusual independence of phosphorylated reactant substrates. The current text describes the protein engineering of FSA, applying principles of directed evolution, for the generation, production and characterization of new aldolase variants. A range of new enantiopure polyhydroxylated compounds were produced applying isolated FSA variants.
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Affiliation(s)
- Mikael Widersten
- Department of Chemistry-BMC, Uppsala University, Uppsala, Sweden.
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97
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Trost BM, Tracy JS. Catalytically Generated Vanadium Enolates Formed via Interruption of the Meyer-Schuster Rearrangement as Useful Reactive Intermediates. Acc Chem Res 2020; 53:1568-1579. [PMID: 32692147 DOI: 10.1021/acs.accounts.0c00285] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Enolate chemistry is one of the most fundamental strategies for the formation of carbon-carbon and carbon-heteroatom bonds. Classically, this has been accomplished through the use of stoichiometric quantities of strong base and cryogenic reaction temperatures. However, these techniques present issues related to enolate regioselectivity and functional group tolerance. While more modern methods utilizing stoichiometric activating agents have overcome some of these limitations, these processes add additional steps and suffer from poor atom economy. While certain classes of highly acidic nucleophiles have enabled the development of elegant and general catalytic solutions to address all of these limitations, functionalizing less acidic nucleophiles remains difficult.To overcome these challenges, we developed an alternative general approach for the formation and subsequent functionalization of metal enolates that leverages catalytic amounts of Lewis acid and entirely avoids the need for exogenous base or stoichiometric additives. To do so, we re-engineered the classical Meyer-Schuster rearrangement, which normally converts propargylic alcohols into α,β-unsaturated carbonyl compounds. By careful control of reaction conditions and by selection of an appropriate vanadium-oxo catalyst, the transient metal enolates formed via the 1,3-transposition of propargylic or allenylic alcohols can be guided away from simple protonation reaction pathways and toward more synthetically productive carbon-carbon, carbon-halogen, and carbon-nitrogen bond-forming processes.By utilizing readily available propargylic and allenylic alcohols as our starting materials and relying on a catalytic 1,3-transposition to generate metal enolates in situ, all issues related to the regioselectivity of enolate formation are resolved. Likewise, utilization of a simple isomerization for enolate formation results in a highly efficient process that can be 100% atom economical. The mild reaction conditions employed also allow for remarkable chemoselectivity. Functional groups not typically conducive to enolate chemistry, such as alkynyl ketones, methyl ketones, free alcohols, and primary alkyl halides, are all well tolerated. Finally, by varying the substitution patterns of the alcohol starting materials, enolates of ketones, esters, and even amides are all accessible.Utilizing this strategy starting from propargylic alcohols, we have developed functionalization reactions that produce highly substituted and geometrically defined α-functionalized α,β-unsaturated carbonyl compounds. Such processes include aldol, Mannich, and electrophilic halogenation reactions, as well as dual catalytic reactions wherein catalytically generated vanadium enolates are trapped with catalytically generated palladium π-allyl electrophiles. In the case of allenylic alcohols, we have developed complementary aldol, Mannich, halogenation, and dual catalytic processes to generate α'-functionalized α,β-unsaturated carbonyl products.The results described in this work showcase the power and generality of our alternative approach to enolate chemistry. Additionally, we point out unaddressed challenges in the field and invite other groups to help innovate in these areas.
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Affiliation(s)
- Barry M. Trost
- Department of Chemistry, Stanford University, 333 Campus Drive, Stanford, California 94305, United States
| | - Jacob S. Tracy
- Department of Chemistry, Stanford University, 333 Campus Drive, Stanford, California 94305, United States
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98
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Abstract
α-Substituted α,β-unsaturated aldehydes represent a highly reactive class of compounds with a broad scope of application. Therefore, the development of methods for the synthesis of these bifunctional compounds is a dynamically progressing area of research. This review summarizes and highlights methods for the synthesis of α-alkyl α,β-alkenals.
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Affiliation(s)
- Ekaterina A. Verochkina
- A.E. Favorsky Irkutsk Institute of Chemistry, Siberian Branch of the Russian Academy of Sciences, 1 Favorsky Street, 664033 Irkutsk, Russian Federation
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99
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Greve E, Porter JD, Dockendorff C. Computationally‐Guided Investigation of Dual Amine/pi Lewis Acid Catalysts for Direct Additions of Aldehydes and Ketones to Unactivated Alkenes and Alkynes. ChemistrySelect 2020. [DOI: 10.1002/slct.202001840] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Eric Greve
- Department of ChemistryMarquette University P.O. Box 1881 Milwaukee WI 53201-1881 USA
| | - Jacob D. Porter
- Department of ChemistryMarquette University P.O. Box 1881 Milwaukee WI 53201-1881 USA
| | - Chris Dockendorff
- Department of ChemistryMarquette University P.O. Box 1881 Milwaukee WI 53201-1881 USA
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100
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Pasternak‐Suder M, Pacułt W, Baś S, Mlynarski J. Asymmetric Aldol Reaction of Pyruvate Promoted by Chiral Tertiary Amines. ChemistrySelect 2020. [DOI: 10.1002/slct.202001450] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
| | - Wojciech Pacułt
- Faculty of Chemistry Jagiellonian University Gronostajowa 2 30-387 Krakow Poland
| | - Sebastian Baś
- Faculty of Chemistry Jagiellonian University Gronostajowa 2 30-387 Krakow Poland
| | - Jacek Mlynarski
- Institute of Organic Chemistry Polish Academy of Science Kasprzaka 44/52 01-224 Warsaw Poland
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