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Kattula B, Munakala A, Kashyap R, Nallamilli T, Nagendla NK, Naza S, Mudiam MKR, Chegondi R, Addlagatta A. Strategic enzymatic enantioselective desymmetrization of prochiral cyclohexa-2,5-dienones. Chem Commun (Camb) 2024; 60:6647-6650. [PMID: 38856301 DOI: 10.1039/d4cc02181a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/11/2024]
Abstract
Asymmetric desymmetrization through the selective reduction of one double bond of prochiral 2,5-cyclohexadienones is highly challenging. A novel method has been developed for synthesizing chiral cyclohexenones by employing an ene-reductase (Bacillus subtilis YqjM) enzyme that belongs to the OYE family. Our strategy demonstrates high substrate scope and enantioselectivity towards substrates containing all-carbon as well as heteroatom (O, N)-containing quaternary centers. The mechanistic studies (kH/D = ∼1.8) indicate that hydride transfer is probably the rate-limiting step. Mutation of several active site residues did not affect the stereochemical outcomes. This work provides a convenient way of synthesizing various enantioselective γ,γ-disubstituted cyclohexanones using enzymes.
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Affiliation(s)
- Bhavita Kattula
- Department of Applied Biology, Hyderabad, India.
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad-201002, India
| | - Anandarao Munakala
- Department of Organic Synthesis and Process Chemistry, Hyderabad, Telangana, India.
| | | | - Tarun Nallamilli
- Department of Organic Synthesis and Process Chemistry, Hyderabad, Telangana, India.
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad-201002, India
| | - Narendra Kumar Nagendla
- Department of Analytical and Structural Chemistry, CSIR-Indian Institute of Chemical Technology, Hyderabad-500 007, Telangana, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad-201002, India
| | - Surabhi Naza
- Department of Applied Biology, Hyderabad, India.
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad-201002, India
| | - Mohana Krishna Reddy Mudiam
- Department of Analytical and Structural Chemistry, CSIR-Indian Institute of Chemical Technology, Hyderabad-500 007, Telangana, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad-201002, India
| | - Rambabu Chegondi
- Department of Organic Synthesis and Process Chemistry, Hyderabad, Telangana, India.
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad-201002, India
| | - Anthony Addlagatta
- Department of Applied Biology, Hyderabad, India.
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad-201002, India
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2
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Türkeş C, Demir Y, Biçer A, Cin GT, Gültekin MS, Beydemir Ş. Exploration of Some Bis‐Sulfide and Bis‐Sulfone Derivatives as Non‐Classical Aldose Reductase İnhibitors. ChemistrySelect 2023. [DOI: 10.1002/slct.202204350] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- Cüneyt Türkeş
- Department of Biochemistry Faculty of Pharmacy Erzincan Binali Yıldırım University Erzincan 24002 Turkey
| | - Yeliz Demir
- Department of Pharmacy Services Nihat Delibalta Göle Vocational High School Ardahan University Ardahan 75700 Turkey
| | - Abdullah Biçer
- The Rectorate of Bilecik Şeyh Edebali University Bilecik 11230 Turkey
| | - Günseli Turgut Cin
- Department of Chemistry Faculty of Science Akdeniz University Antalya 07058 Turkey
| | | | - Şükrü Beydemir
- The Rectorate of Bilecik Şeyh Edebali University Bilecik 11230 Turkey
- Department of Biochemistry Faculty of Pharmacy Anadolu University Eskişehir 26470 Turkey
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3
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Supramolecular Diversity of Oxabicyclo[2.2.2]octenes Formed between Substituted 2H-Pyran-2-ones and Vinyl-Moiety-Containing Dienophiles. Symmetry (Basel) 2020. [DOI: 10.3390/sym12101714] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
In Diels–Alder reactions, 2H-pyran-2-ones as dienes can yield a large variety of cycloadducts with up to four contiguous carbon stereogenic centers. Some of the potentially most useful, however difficult to prepare due to their low thermal stability, are the primary CO2-containing oxabicyclo[2.2.2]octenes, which could be formed as eight distinctive isomers (two sets of regioisomers, each of these composed of four different stereoisomers). A high-pressure synthesis of such products was recently described in a few cases where vinyl-moiety-containing dienophiles were used as synthetic equivalents of acetylene. However, structures of the primary products have been so far only rarely investigated in detail. Herein, we present seven novel single-crystal X-ray diffraction structures of such cycloadducts of both stereoisomeric forms, i.e., endo and exo. Additionally, we present a single-crystal structure of a rare case of a cyclohexadiene system stable at room temperature, obtained as a secondary product upon the retro-hetero-Diels–Alder elimination of CO2 under thermal conditions (microwave irradiation), during this elimination the symmetry is increased and out of eight initially possible isomers of the reactant, this number in the product is decreased to four. In oxabicyclo[2.2.2]octene compounds, centrosymmetric hydrogen bonding was found to be the predominant motif and diverse supramolecular patterns were observed due to rich variety of C–H⋯O and C–H⋯π interactions.
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Turgut Cin G, Nohut Maşlakcı N, Biçer A, Yakalı G, Uygun Öksüz A. Electrochromic Properties of Electrospun Fibers Based on Bis‐Thiomethylcyclohexanone Derivatives. ChemistrySelect 2019. [DOI: 10.1002/slct.201903640] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Günseli Turgut Cin
- Department of ChemistryFaculty of ScienceAkdeniz University Antalya 07058 Turkey
| | - Neslihan Nohut Maşlakcı
- Department of Food Processing, Gelendost Vocational SchoolIsparta University of Applied Sciences Isparta 32900 Turkey
- Innovative Technologies Application and Research CenterSuleyman Demirel University Isparta 32260 Turkey
| | - Abdullah Biçer
- Department of ChemistryFaculty of ScienceAkdeniz University Antalya 07058 Turkey
| | - Gül Yakalı
- Department of Engineering SciencesFaculty of Engineering, Izmir Katip Celebi University Izmir 35620 Turkey
| | - Ayşegül Uygun Öksüz
- Department of ChemistryFaculty of Arts and ScienceSuleyman Demirel University Isparta 32260 Turkey
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5
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Synthesis, characterization, crystal structure of novel bis-thiomethylcyclohexanone derivatives and their inhibitory properties against some metabolic enzymes. Bioorg Chem 2019; 82:393-404. [DOI: 10.1016/j.bioorg.2018.11.001] [Citation(s) in RCA: 93] [Impact Index Per Article: 18.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2018] [Revised: 10/03/2018] [Accepted: 11/01/2018] [Indexed: 12/17/2022]
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6
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Kour M, Gupta R, Bansal RK. Experimental and Theoretical Investigation of the Reaction of Secondary Amines with Maleic Anhydride. Aust J Chem 2017. [DOI: 10.1071/ch17206] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
The reaction of secondary amines, namely 1-methylpiperazine, pyrrolidine, morpholine, 2-methylpiperidine, and diethylamine, with maleic anhydride has been investigated experimentally and theoretically at the DFT level. Under kinetic control, i.e. at −78°C or −15°C, amines add across the C=O functionality exclusively and the initially formed addition products isomerize to the corresponding N-substituted maleimic acid derivatives. In contrast to the acyclic α,β-unsaturated carbonyl compounds, amine does not add across the C=C functionality in maleic anhydride even under thermodynamic control. This behaviour of maleic anhydride can be rationalized on the basis of the local condensed Fukui functions, which reveal that the carbonyl carbon atoms in maleic anhydride are much harder than in an acyclic α,β-unsaturated carbonyl compound, such as acrolein. This prompts the amines to attack the carbonyl group in maleic anhydride exclusively.
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7
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Koppolu SR, Balamurugan R. In situ formed acetals facilitated direct Michael addition of unactivated ketones. NEW J CHEM 2017. [DOI: 10.1039/c6nj02954j] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
A facile Michael addition of unactivated ketones under Brønsted acid conditions for the synthesis of 1,5-diketones.
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8
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Arkan F, Izadyar M. Quantum chemical aspects of solvent effects on the Diels–Alder reaction of 2,3-dimethyl-1,3-butadiene and diethyl azodicarboxylate. PROGRESS IN REACTION KINETICS AND MECHANISM 2016. [DOI: 10.3184/146867816x14702227410256] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
A comprehensive theoretical study was performed regarding the solvent effect on the Diels–Alder reaction of 2,3-dimethyl-1,3-butadiene and the hetero-dienophile, diethyl azodicarboxylate. Reaction rates in the various solutions were studied using SCRF–DFT theory and good agreement with the experimental results was obtained. According to natural bond orbital analysis, it was confirmed that the stabilisation energy of the C–N bonds contributes to the strong interaction between the solvents and transition state (TS) structures. Topological analyses showed a linear correlation between the interaction energy and the sum of electron density at the bond critical point of C–N at the TS. Moreover, with an increase in the overall electron density of the C–N bond critical point, the vibrational frequencies were decreased. Finally, some correlations between the quantum reactivity indices and the rate constants in the presence of 23 solvents were investigated.
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Affiliation(s)
- Foroogh Arkan
- Department of Chemistry, Ferdowsi University of Mashhad, International Campus, Mashhad, Iran
| | - Mohammad Izadyar
- Department of Chemistry, Faculty of Sciences, Ferdowsi University of Mashhad, Mashhad, Iran
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Guang J, Rout S, Bihani M, Larson AJ, Arman HD, Zhao JCG. Organocatalyzed Enantioselective Direct Mannich Reaction of α-Styrylacetates. Org Lett 2016; 18:2648-51. [DOI: 10.1021/acs.orglett.6b01087] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jie Guang
- Department of Chemistry, University of Texas at San Antonio, One UTSA Circle, San Antonio, Texas 78249-0698, United States
| | - Saroj Rout
- Department of Chemistry, University of Texas at San Antonio, One UTSA Circle, San Antonio, Texas 78249-0698, United States
| | - Manisha Bihani
- Department of Chemistry, University of Texas at San Antonio, One UTSA Circle, San Antonio, Texas 78249-0698, United States
| | - Ariel J. Larson
- Department of Chemistry, University of Texas at San Antonio, One UTSA Circle, San Antonio, Texas 78249-0698, United States
| | - Hadi D. Arman
- Department of Chemistry, University of Texas at San Antonio, One UTSA Circle, San Antonio, Texas 78249-0698, United States
| | - John C.-G. Zhao
- Department of Chemistry, University of Texas at San Antonio, One UTSA Circle, San Antonio, Texas 78249-0698, United States
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10
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Yoshida M, Ukigai H, Shibatomi K, Hara S. Organocatalytic asymmetric Michael addition of α-branched aldehydes to vinyl ketones: synthesis of 5-ketoaldehydes possessing a stereo-controlled all-carbon quaternary stereogenic center. Tetrahedron Lett 2015. [DOI: 10.1016/j.tetlet.2015.04.107] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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11
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Otani T, Namatame W, Tamai Y. Highly enantioselective Michael addition of 2-alkoxyphenyl esters of α-substituted β-keto acids to non-prochiral α,β-unsaturated carbonyl compounds catalyzed by sodium 2′-[2-(2-methoxyethoxy)ethoxy]-1,1′-binaphthalen-2-oxide. Tetrahedron Lett 2014. [DOI: 10.1016/j.tetlet.2014.10.146] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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12
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Metal-free asymmetric hydrogenation and hydrosilylation catalyzed by frustrated Lewis pairs. Tetrahedron Lett 2014. [DOI: 10.1016/j.tetlet.2014.10.138] [Citation(s) in RCA: 96] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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13
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Otani T, Sugawara A, Tamai Y. Asymmetric Michael addition of 2-alkoxyphenyl α-substituted nitroacetates to non-prochiral α,β-unsaturated carbonyl compounds catalyzed by podand-type alkali metal 2′-substituted 1,1′-binaphthalen-2-oxides. Tetrahedron Lett 2014. [DOI: 10.1016/j.tetlet.2014.07.046] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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14
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Yoshida M, Kubara A, Nagasawa Y, Hara S, Yamanaka M. Asymmetric Michael Addition of β-Ketoesters to Enones Catalyzed by the Lithium Salt of a Primary β-Amino Acid. ASIAN J ORG CHEM 2014. [DOI: 10.1002/ajoc.201400024] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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15
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Yoshida M. Catalytic Asymmetric Synthesis with a Primary Amino Acid and Its Salt. J SYN ORG CHEM JPN 2014. [DOI: 10.5059/yukigoseikyokaishi.72.876] [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]
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16
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Yoshida M, Nagasawa Y, Kubara A, Hara S, Yamanaka M. Mechanistic study of asymmetric Michael addition of malonates to enones catalyzed by a primary amino acid lithium salt. Tetrahedron 2013. [DOI: 10.1016/j.tet.2013.09.066] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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17
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Yoshida M, Terumine T, Masaki E, Hara S. Direct Asymmetric α-Allylation of α-Branched Aldehydes by Two Catalytic Systems with an Achiral Pd Complex and a Chiral Primary α-Amino Acid. J Org Chem 2013; 78:10853-9. [DOI: 10.1021/jo4018414] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Masanori Yoshida
- Division of Chemical Process Engineering, Graduate School of Engineering, and ‡Molecular Chemistry
and Engineering Course, Graduate School of Chemical Sciences and Engineering, Hokkaido University, Kita 13-jo Nishi 8, Kita-ku, Sapporo, Hokkaido 060-8628, Japan
| | - Tatsuaki Terumine
- Division of Chemical Process Engineering, Graduate School of Engineering, and ‡Molecular Chemistry
and Engineering Course, Graduate School of Chemical Sciences and Engineering, Hokkaido University, Kita 13-jo Nishi 8, Kita-ku, Sapporo, Hokkaido 060-8628, Japan
| | - Erika Masaki
- Division of Chemical Process Engineering, Graduate School of Engineering, and ‡Molecular Chemistry
and Engineering Course, Graduate School of Chemical Sciences and Engineering, Hokkaido University, Kita 13-jo Nishi 8, Kita-ku, Sapporo, Hokkaido 060-8628, Japan
| | - Shoji Hara
- Division of Chemical Process Engineering, Graduate School of Engineering, and ‡Molecular Chemistry
and Engineering Course, Graduate School of Chemical Sciences and Engineering, Hokkaido University, Kita 13-jo Nishi 8, Kita-ku, Sapporo, Hokkaido 060-8628, Japan
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18
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Zhou Y, Liu Q, Gong Y. Organocatalytic asymmetric Michael addition of ethyl nitroacetate to enones using natural amino acids-derived C1-symmetric chiral primary–secondary diamines. Tetrahedron Lett 2013. [DOI: 10.1016/j.tetlet.2013.04.005] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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19
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Wang Z, Zhao K, Fu J, Zhang J, Yin W, Tang Y. Organocatalytic 1,4-conjugate addition of ascorbic acid to α,β-unsaturated aldehydes: bio-inspired total syntheses of leucodrin, leudrin and proposed structure of dilaspirolactone. Org Biomol Chem 2013; 11:2093-7. [PMID: 23440072 DOI: 10.1039/c3ob00046j] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The organocatalytic additions of ascorbic acid to various α,β-unsaturated aldehydes via tandem 1,4-conjugate addition/hemiacetalization/hemiketalization were developed, which provided a rapid entry into the 5-5-5 spirodilactone cores of a family of ascorbylated natural products. Based on the described chemistry, total syntheses of leucodrin, leudrin and the proposed structure of dilaspirolactone were achieved.
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Affiliation(s)
- Zhaofeng Wang
- The Comprehensive AIDS Research Center, Department of Pharmacology and Pharmaceutical Sciences, School of Medicine, Tsinghua University, Beijing 100084, China
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20
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Zhou Y, Liu Q, Gong Y. Camphor-derived C1-symmetric chiral diamine organocatalysts for asymmetric Michael addition of nitroalkanes to enones. Org Biomol Chem 2013; 10:7618-27. [PMID: 22893041 DOI: 10.1039/c2ob25922b] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A series of stable C(1)-symmetric chiral diamines (2a–2l) were conveniently synthesized by condensing exo-(-)-bornylamine or (+)-(1S,2S,5R)-menthylamine with various commercially available Cbz-protected amino acids. Among them, 2a can efficiently promote the Michael addition of nitroalkanes to a broad scope of enones with high yields (up to 96%) and excellent enantioselectivities (up to 98%) under mild conditions.
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Affiliation(s)
- Yirong Zhou
- School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan 430074, People's Republic of China
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21
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Yoshida M, Kubara A, Hara S. Primary β-Amino Acid Salt-catalyzed Asymmetric Michael Addition of Benzoylacetates to Cyclic Enones and Its Application for the Synthesis of Enantioenriched 1,5-Diketones. CHEM LETT 2013. [DOI: 10.1246/cl.2013.180] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Affiliation(s)
- Masanori Yoshida
- Division of Chemical Process Engineering, Faculty of Engineering, Hokkaido University
- Molecular Chemistry and Engineering Course, Graduate School of Chemical Sciences and Engineering, Hokkaido University
| | - Ami Kubara
- Molecular Chemistry and Engineering Course, Graduate School of Chemical Sciences and Engineering, Hokkaido University
| | - Shoji Hara
- Division of Chemical Process Engineering, Faculty of Engineering, Hokkaido University
- Molecular Chemistry and Engineering Course, Graduate School of Chemical Sciences and Engineering, Hokkaido University
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22
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Dudziński K, Pakulska AM, Kwiatkowski P. An Efficient Organocatalytic Method for Highly Enantioselective Michael Addition of Malonates to Enones Catalyzed by Readily Accessible Primary Amine-Thiourea. Org Lett 2012; 14:4222-5. [DOI: 10.1021/ol3019055] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Krzysztof Dudziński
- Faculty of Chemistry, University of Warsaw, Pasteura 1, 02-093 Warsaw, Poland
| | - Anna M. Pakulska
- Faculty of Chemistry, University of Warsaw, Pasteura 1, 02-093 Warsaw, Poland
| | - Piotr Kwiatkowski
- Faculty of Chemistry, University of Warsaw, Pasteura 1, 02-093 Warsaw, Poland
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23
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Double Molecular Recognition with Aminoorganoboron Complexes: Selective Alcoholysis of β-Dicarbonyl Derivatives. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201200304] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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24
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Oishi S, Saito S. Double Molecular Recognition with Aminoorganoboron Complexes: Selective Alcoholysis of β-Dicarbonyl Derivatives. Angew Chem Int Ed Engl 2012; 51:5395-9. [DOI: 10.1002/anie.201200304] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2012] [Revised: 02/23/2012] [Indexed: 11/06/2022]
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25
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Pandey G, Adate PA, Puranik VG. Organocatalytic dynamic kinetic resolution via conjugate addition: synthesis of chiral trans-2,5-dialkylcyclohexanones. Org Biomol Chem 2012; 10:8260-7. [DOI: 10.1039/c2ob26597d] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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26
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Paradisi E, Righi P, Mazzanti A, Ranieri S, Bencivenni G. Iminium ion catalysis: the enantioselective Friedel–Crafts alkylation–acetalization cascade of naphthols with α,β-unsaturated cyclic ketones. Chem Commun (Camb) 2012; 48:11178-80. [DOI: 10.1039/c2cc35582e] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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27
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Yoshida M, Masaki E, Ikehara H, Hara S. Enantioselective synthesis of gabapentin analogues via organocatalytic asymmetric Michael addition of α-branched aldehydes to β-nitroacrylates. Org Biomol Chem 2012; 10:5289-97. [DOI: 10.1039/c2ob25413a] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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28
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Yoshida M, Narita M, Hara S. Asymmetric Michael Addition of Malonates to Enones Catalyzed by a Primary β-Amino Acid and Its Lithium Salt. J Org Chem 2011; 76:8513-7. [DOI: 10.1021/jo201429w] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Masanori Yoshida
- Division of Chemical Process Engineering, Graduate School of Engineering, Hokkaido University, Kita 13-jo Nishi 8, Kita-ku, Sapporo, Hokkaido 060-8628, Japan
| | - Mao Narita
- Division of Chemical Process Engineering, Graduate School of Engineering, Hokkaido University, Kita 13-jo Nishi 8, Kita-ku, Sapporo, Hokkaido 060-8628, Japan
| | - Shoji Hara
- Division of Chemical Process Engineering, Graduate School of Engineering, Hokkaido University, Kita 13-jo Nishi 8, Kita-ku, Sapporo, Hokkaido 060-8628, Japan
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