1
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Saini N, Khajuria C, Biswas RG, Singh VK. Organocatalytic Asymmetric Cascade Michael-Acyl Transfer Reaction between 2-Fluoro-1,3-diketones and 2-Hydroxynitrostyrenes. J Org Chem 2024. [PMID: 38175926 DOI: 10.1021/acs.joc.3c02512] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2024]
Abstract
An organocatalytic asymmetric cascade Michael-acyl transfer reaction of 2-hydroxynitrostyrenes and monofluorinated β-diketones has been developed employing a cooperative catalytic system. A combination of quinine-derived bifunctional squaramide catalyst and achiral hydrogen bond donor cocatalyst was found to be the most effective for this reaction and provided the fluorinated acyl transfer products in high yields with good diastereo- and excellent enantioselectivities. Synthetic transformations have been demonstrated, including the synthesis of functionalized 2,3-dihydrobenzofurans and 1-pyrroline.
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Affiliation(s)
- Nidhi Saini
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur, Uttar Pradesh 208 016, India
| | - Chhavi Khajuria
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur, Uttar Pradesh 208 016, India
| | - Rayhan G Biswas
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur, Uttar Pradesh 208 016, India
| | - Vinod K Singh
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur, Uttar Pradesh 208 016, India
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2
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Gambhir D, Singh S, Singh RP. Enamine/Iminium-based Dual Organocatalytic Systems for Asymmetric Catalysis and Synthesis. Chem Asian J 2023:e202300627. [PMID: 37910066 DOI: 10.1002/asia.202300627] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2023] [Revised: 10/22/2023] [Accepted: 10/31/2023] [Indexed: 11/03/2023]
Abstract
The rational combination of two catalysts to expedite the construction of chiral complex biologically and pharmacologically relevant chiral compounds has widely gained momentum over the past decade. In particular, enamine or iminium catalysis ensuing from the activation of aldehyde or ketone by chiral amine catalysts in conjugation with other organocatalytic cycles has facilitated several asymmetric transformations to yield the enantioenriched products. Regardless of the considerable discussion on the various dual catalytic approaches, literature lacks a comprehensive review focusing on the enamine and iminium-based dual organocatalytic systems. Thus, this review article has discussed the noteworthy achievements in the field of asymmetric catalysis and synthesis catalyzed by the enamine and iminium-based dual organocatalytic systems.
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Affiliation(s)
- Diksha Gambhir
- Prof. Ravi P. Singh, Department of Chemistry, Institute of Technology Delhi, Hauz Khas, New Delhi, 110-016, India
| | - Sanjay Singh
- Prof. Ravi P. Singh, Department of Chemistry, Institute of Technology Delhi, Hauz Khas, New Delhi, 110-016, India
| | - Ravi P Singh
- Prof. Ravi P. Singh, Department of Chemistry, Institute of Technology Delhi, Hauz Khas, New Delhi, 110-016, India
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3
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Kim Y, Kim SY, Kim SG. Organocatalytic Asymmetric [3 + 2]-Annulations of γ-Sulfonamido/γ-Hydroxy-α,β-Unsaturated Ketones with Cyclic N-Sulfimines: Synthesis of Chiral Polyheterotricyclic Imidazolidines and Oxazolidines. J Org Chem 2023; 88:1113-1127. [PMID: 36580571 DOI: 10.1021/acs.joc.2c02634] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
The first organocatalytic asymmetric [3 + 2]-annulation of γ-sulfonamido-α,β-unsaturated ketones with cyclic N-sulfimines has been developed, and enantioenriched functionalized polyheterotricyclic imidazolidines were obtained in good yields and with excellent enantioselectivities. This approach was also extended to the asymmetric [3 + 2]-annulation of γ-hydroxy-α,β-unsaturated ketones, affording enantioenriched polyheterotricyclic oxazolidines. In addition, base-catalyzed [3 + 2]-annulations of γ-sulfonamido/γ-hydroxy-α,β-unsaturated ketones with cyclic N-sulfimines were re-investigated under mild reaction conditions for the synthesis of racemic polyheterotricyclic imidazolidines and oxazolidines with excellent diastereoselectivities.
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Affiliation(s)
- Yoseop Kim
- Department of Chemistry, College of Natural Science, Kyonggi University, 154-42 Gwanggyosan-ro, Yeongtong-gu, Suwon 16227, Republic of Korea
| | - Seung Yeon Kim
- Department of Chemistry, College of Natural Science, Kyonggi University, 154-42 Gwanggyosan-ro, Yeongtong-gu, Suwon 16227, Republic of Korea
| | - Sung-Gon Kim
- Department of Chemistry, College of Natural Science, Kyonggi University, 154-42 Gwanggyosan-ro, Yeongtong-gu, Suwon 16227, Republic of Korea
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4
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Bobek KB, Ezzat NS, Jones BS, Bian Y, Shaw TE, Jurca T, Li H, Yuan Y. Total Synthesis of Polysubstituted γ-Butyrolactone Lignans (-)-Hinokinin, (-)-Bicubebin B, and (-)-Isodeoxypodophyllotoxin via Oxime Carbonate Formation. Org Lett 2023; 25:31-36. [PMID: 36562600 PMCID: PMC10246472 DOI: 10.1021/acs.orglett.2c03727] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
The diverse structures and profound biological activities of lignan natural products have enticed significant effort in the exploration of new methodologies for their total synthesis. We have prepared γ-butyrolactone oximes from readily available δ-nitro alcohols via Boc2O mediated cyclization. The mild conditions are compatible with a wide range of functional groups, and this methodology has been applied to the total synthesis of five lignan natural products.
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Affiliation(s)
- Katelyn B Bobek
- Department of Chemistry, University of Central Florida, Orlando, Florida 32816, United States
| | - Nameer S Ezzat
- Department of Chemistry, University of Central Florida, Orlando, Florida 32816, United States
- Department of Chemistry, University of Mosul, Al Majmoaa St., Mosul 41002, Iraq
| | - Brandon S Jones
- Department of Chemistry, University of Central Florida, Orlando, Florida 32816, United States
| | - Yujia Bian
- Department of Chemistry, University of Central Florida, Orlando, Florida 32816, United States
| | - Thomas E Shaw
- Department of Chemistry, University of Central Florida, Orlando, Florida 32816, United States
| | - Titel Jurca
- Department of Chemistry, University of Central Florida, Orlando, Florida 32816, United States
| | - Hongya Li
- Department of Chemistry, University of Central Florida, Orlando, Florida 32816, United States
- College of Life Sciences, Hebei Agricultural University, Baoding, Hebei 071000, P.R. China
| | - Yu Yuan
- Department of Chemistry, University of Central Florida, Orlando, Florida 32816, United States
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5
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Shukla K, Khushboo, Mahto P, Singh VK. Enantioselective synthesis of tetrahydrofuran spirooxindoles via domino oxa-Michael/Michael addition reaction using a bifunctional squaramide catalyst. Org Biomol Chem 2022; 20:4155-4160. [PMID: 35521781 DOI: 10.1039/d2ob00633b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An enantioselective approach for the synthesis of tetrahydrofuran spirooxindoles via domino oxa-Michael/Michael addition reaction of γ-hydroxyenones to isatylidene malononitriles, using a cinchona derived bifunctional squaramide catalyst has been developed. The methodology is the first success of enantioselective oxa-Michael addition to isatylidene malononitriles. The spiro products were obtained in excellent yields with moderate to good enantio- and diastereoselectivities. Scale-up of the reaction and synthetic transformation of the spiro product into structurally complex molecules have been performed.
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Affiliation(s)
- Khyati Shukla
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur-208 016, India.
| | - Khushboo
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur-208 016, India.
| | - Pratibha Mahto
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur-208 016, India.
| | - Vinod K Singh
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur-208 016, India.
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6
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Thangamalar S, Thangamani M, Srinivasan K. The Cloke-Wilson rearrangement of aroyl-substituted donor-acceptor cylopropanes containing arylethyl donors. Org Biomol Chem 2022; 20:3145-3153. [PMID: 35343561 DOI: 10.1039/d2ob00292b] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The chemistry of donor-acceptor (D-A) cyclopropanes containing alkyl donors has been scantily investigated. In the present work, we have synthesized new D-A cyclopropanes containing arylethyl donors and explored their reactivity in the presence of Lewis acids. Upon treatment with SnCl4, these cyclopropanes underwent the Cloke-Wilson rearrangement to yield 3,4,5-trisubstituted γ-butyrolactones in good yields with high diastereoselectivity.
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Affiliation(s)
| | - Murugesan Thangamani
- School of Chemistry, Bharathidasan University, Tiruchirappalli-620024, Tamil Nadu, India.
| | - Kannupal Srinivasan
- School of Chemistry, Bharathidasan University, Tiruchirappalli-620024, Tamil Nadu, India.
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7
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Shikari A, Mandal K, Chopra D, Pan SC. Organocatalytic Asymmetric Synthesis of Cyclic Acetals with Spirooxindole Skeleton. Adv Synth Catal 2022. [DOI: 10.1002/adsc.202101057] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Amit Shikari
- Department of Chemistry Indian Institute of Technology Guwahati Assam 781039 India
| | - Koushik Mandal
- Department of Chemistry Indian Institute of Science Education and Research Bhopal 462066 India
| | - Deepak Chopra
- Department of Chemistry Indian Institute of Science Education and Research Bhopal 462066 India
| | - Subhas Chandra Pan
- Department of Chemistry Indian Institute of Technology Guwahati Assam 781039 India
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8
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García-Santos WH, Ordóñez-Hernández J, Farfán-Paredes M, Castro-Cruz HM, Macías-Ruvalcaba NA, Farfán N, Cordero-Vargas A. Dibromo-BODIPY as an Organic Photocatalyst for Radical-Ionic Sequences. J Org Chem 2021; 86:16315-16326. [PMID: 34726403 DOI: 10.1021/acs.joc.1c01598] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A new dibrominated 4,4-difluoro-4-bora-3a,4a-diaza-s-indacene (BODIPY) is reported as a new metal-free photocatalyst. This BODIPY showed similar optoelectronic, electrochemical, and performance properties to those of Ru(bpy)3Cl2, one of the most common photocatalysts in a known radical-ionic transformation, such as the formation of 1,4-dicarbonyl compounds. Moreover, additional sequences in which the generated oxonium ion is trapped by an internal nucleophile were developed using this BODIPY photocatalyst. These new sequences allowed the straightforward preparation of γ-alkoxylactones, monoprotected 1,4-ketoaldehydes, and dihydrofurans. This new catalyst, the methodology, and the forged functional groups could be important tools in organic synthesis.
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Affiliation(s)
- William H García-Santos
- Instituto de Química, Universidad Nacional Autónoma de México, Circuito Exterior s/n, Ciudad Universitaria, Coyoacán, C.P., México, D.F. 04510, México
| | - Javier Ordóñez-Hernández
- Instituto de Química, Universidad Nacional Autónoma de México, Circuito Exterior s/n, Ciudad Universitaria, Coyoacán, C.P., México, D.F. 04510, México
| | - Mónica Farfán-Paredes
- Facultad de Química, Departamento de Química Orgánica, Universidad Nacional Autónoma de México, Ciudad de México 04510, México
| | - Hiram M Castro-Cruz
- Facultad de Química, Departamento de Fisicoquímica, Universidad Nacional Autónoma de México, Ciudad de México 04510, México
| | - Norma A Macías-Ruvalcaba
- Facultad de Química, Departamento de Fisicoquímica, Universidad Nacional Autónoma de México, Ciudad de México 04510, México
| | - Norberto Farfán
- Facultad de Química, Departamento de Química Orgánica, Universidad Nacional Autónoma de México, Ciudad de México 04510, México
| | - Alejandro Cordero-Vargas
- Instituto de Química, Universidad Nacional Autónoma de México, Circuito Exterior s/n, Ciudad Universitaria, Coyoacán, C.P., México, D.F. 04510, México
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9
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Parida C, Mondal B, Ghosh A, Pan SC. Organocatalytic Asymmetric Synthesis of Spirooxindole Embedded Oxazolidines. J Org Chem 2021; 86:13082-13091. [PMID: 34448585 DOI: 10.1021/acs.joc.1c00644] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
The first organocatalytic asymmetric synthesis of spirooxindole embedded oxazolidines has been developed via a domino reaction involving hemiaminal formation, followed by an unprecedented aza-Michael reaction between isatin derived N-Boc ketimines and γ-hydroxy enones. A quinine derived bifunctional squaramide catalyst was found to be efficient for this reaction, and the products were obtained in good diastereoselectivity and with high enantioselectivity.
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Affiliation(s)
- Chandrakanta Parida
- Department of Chemistry, Indian Institute of Technology Guwahati, North Guwahati, Assam 781039, India
| | - Buddhadeb Mondal
- Department of Chemistry, Indian Institute of Technology Guwahati, North Guwahati, Assam 781039, India
| | - Animesh Ghosh
- Department of Chemistry, Indian Institute of Technology Guwahati, North Guwahati, Assam 781039, India
| | - Subhas Chandra Pan
- Department of Chemistry, Indian Institute of Technology Guwahati, North Guwahati, Assam 781039, India
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10
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Lazzarotto M, Hartmann P, Pletz J, Belaj F, Kroutil W, Payer SE, Fuchs M. Asymmetric Allylation Catalyzed by Chiral Phosphoric Acids: Stereoselective Synthesis of Tertiary Alcohols and a Reagent-Based Switch in Stereopreference. Adv Synth Catal 2021; 363:3138-3143. [PMID: 34413715 PMCID: PMC8359974 DOI: 10.1002/adsc.202100037] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2021] [Revised: 03/29/2021] [Indexed: 11/07/2022]
Abstract
The substrate scope of the asymmetric allylation with zinc organyls catalyzed by 3,3-bis(2,4,6-triisopropylphenyl)-1,1-binaphthyl-2,2-diyl hydrogenphosphate (TRIP) has been extended to non-cyclic ester organozinc reagents and ketones. Tertiary chiral alcohols are obtained with ee's up to 94% and two stereogenic centers can be created. Compared to the previous lactone reagent the stereopreference switches almost completely, proving the fact that the nature of the organometallic compound is of immense importance for the asymmetry of the product.
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Affiliation(s)
- Mattia Lazzarotto
- University of GrazInstitute of Chemistry, Bioorganic and Organic ChemistryHeinrichstrasse 28/II8010GrazAustria
| | - Peter Hartmann
- University of GrazInstitute of Chemistry, Bioorganic and Organic ChemistryHeinrichstrasse 28/II8010GrazAustria
| | - Jakob Pletz
- University of GrazInstitute of Chemistry, Bioorganic and Organic ChemistryHeinrichstrasse 28/II8010GrazAustria
| | - Ferdinand Belaj
- University of GrazInstitute of ChemistryInorganic ChemistrySchubertstraße 1/III8010GrazAustria
| | - Wolfgang Kroutil
- University of GrazInstitute of Chemistry, Bioorganic and Organic ChemistryHeinrichstrasse 28/II8010GrazAustria
| | - Stefan E. Payer
- University of GrazInstitute of Chemistry, Bioorganic and Organic ChemistryHeinrichstrasse 28/II8010GrazAustria
| | - Michael Fuchs
- University of GrazInstitute of Chemistry, Bioorganic and Organic ChemistryHeinrichstrasse 28/II8010GrazAustria
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11
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Organocatalytic asymmetric synthesis of pyrrolo[3,2-c]quinolines via a formal [3+2] cycloaddition-lactamization cascade reaction using a bifunctional squaramide catalyst. Tetrahedron 2021. [DOI: 10.1016/j.tet.2021.132115] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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12
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Homma C, Kano T, Maruoka K. Bifunctional amino sulfonamide-catalyzed asymmetric conjugate addition to alkenyl alkynyl ketimines as enone surrogates. Chem Commun (Camb) 2021; 57:2808-2811. [PMID: 33600542 DOI: 10.1039/d0cc07842e] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
A bifunctional amino sulfonamide-catalyzed asymmetric conjugate addition of aldehydes to alkenyl alkynyl ketimines as reactive surrogates for enones has been developed. Use of a phenylcyclopropane-based amino sulfonamide catalyst, which can activate and orient the ketimines through hydrogen bonding, affords the desired conjugate adducts with high chemo-, diastereo- and enantioselectivity.
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Affiliation(s)
- Chihiro Homma
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo, Kyoto 606-8502, Japan.
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13
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Li SS, Qin Q, Qi Z, Yang LM, Kang Y, Zhang XZ, Ma AJ, Peng JB. Synthesis of disubstituted γ-butyrolactones and spirocyclopropanes via a multicomponent reaction of aldehydes, Meldrum's acid and sulfoxonium ylides. Org Chem Front 2021. [DOI: 10.1039/d1qo00303h] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
An efficient synthesis of disubstituted γ-butyrolactones and spirocyclopropanes via multicomponent reaction of aldehydes, Meldrum's acid and sulfoxonium ylides has been developed.
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Affiliation(s)
- Shan-Shan Li
- School of Biotechnology and Health Sciences
- Wuyi University
- Jiangmen
- People's Republic of China
| | - Qi Qin
- School of Biotechnology and Health Sciences
- Wuyi University
- Jiangmen
- People's Republic of China
| | - Zhuang Qi
- School of Biotechnology and Health Sciences
- Wuyi University
- Jiangmen
- People's Republic of China
| | - Li-Miao Yang
- School of Biotechnology and Health Sciences
- Wuyi University
- Jiangmen
- People's Republic of China
| | - Yun Kang
- School of Biotechnology and Health Sciences
- Wuyi University
- Jiangmen
- People's Republic of China
| | - Xiang-Zhi Zhang
- School of Biotechnology and Health Sciences
- Wuyi University
- Jiangmen
- People's Republic of China
| | - Ai-Jun Ma
- School of Biotechnology and Health Sciences
- Wuyi University
- Jiangmen
- People's Republic of China
| | - Jin-Bao Peng
- School of Biotechnology and Health Sciences
- Wuyi University
- Jiangmen
- People's Republic of China
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14
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Hu J, Gao YQ, Xu D, Chen L, Wen W, Hou Y, Chen L, Xie W. Highly enantioselective addition of aliphatic aldehydes to 2-hydroxychalcone enabled by cooperative organocatalysts. Chem Commun (Camb) 2020; 56:10018-10021. [PMID: 32724997 DOI: 10.1039/d0cc04424e] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Herein, we developed an enantioselective addition of aliphatic aldehydes to 2-hydroxychalcone promoted by cooperative organocatalysts, giving access to hybrid flavonoids in excellent enantioselectivities. This reaction took advantage of cycloisomerization of 2-hydroxychalcone to form a transient flavylium under the irradiation of 24 W CFL, which was trapped by the in situ generated chiral enamine intermediate. The synergistic action of chiral phosphoric acid secured the excellent outcome of this reaction by ion-pairing with the transient flavylium.
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Affiliation(s)
- Jiadong Hu
- Shaanxi Key Laboratory of Natural Products & Chemical Biology, College of Chemistry & Pharmacy, Northwest A&F University, 22 Xinong Road, Yangling 712100, Shaanxi, China.
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15
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Bahou KA, Braddock DC, Meyer AG, Savage GP, Shi Z, He T. A Relay Strategy Actuates Pre-Existing Trisubstituted Olefins in Monoterpenoids for Cross-Metathesis with Trisubstituted Alkenes. J Org Chem 2020; 85:4906-4917. [PMID: 32191466 PMCID: PMC7145354 DOI: 10.1021/acs.joc.0c00067] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
A retrosynthetic disconnection-reconnection analysis of epoxypolyenes-substrates that can undergo cyclization to podocarpane-type tricycles-reveals relay-actuated Δ6,7-functionalized monoterpenoid alcohols for ruthenium benzylidene catalyzed olefin cross-metathesis with homoprenyl benzenes. Successful implementation of this approach provided several epoxypolyenes as expected (E/Z, ca. 2-3:1). The method is further generalized for the cross-metathesis of pre-existing trisubstituted olefins in other relay-actuated Δ6,7-functionalized monoterpenoid alcohols with various other trisubstituted alkenes to form new trisubstituted olefins. Epoxypolyene cyclization of an enantiomerically pure, but geometrically impure, epoxypolyene substrate provides an enantiomerically pure, trans-fused, podocarpane-type tricycle (from the E-geometrical isomer).
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Affiliation(s)
- Karim A Bahou
- Department of Chemistry, Molecular Sciences Research Hub, Imperial College London, White City Campus, 80 Wood Lane, London W12 0BZ, U.K
| | - D Christopher Braddock
- Department of Chemistry, Molecular Sciences Research Hub, Imperial College London, White City Campus, 80 Wood Lane, London W12 0BZ, U.K
| | - Adam G Meyer
- CSIRO Manufacturing, Jerry Price Laboratory, Research Way, Clayton 3168, Victoria, Australia
| | - G Paul Savage
- CSIRO Manufacturing, Jerry Price Laboratory, Research Way, Clayton 3168, Victoria, Australia
| | - Zhensheng Shi
- Department of Chemistry, Molecular Sciences Research Hub, Imperial College London, White City Campus, 80 Wood Lane, London W12 0BZ, U.K
| | - Tianyou He
- Department of Chemistry, Molecular Sciences Research Hub, Imperial College London, White City Campus, 80 Wood Lane, London W12 0BZ, U.K
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16
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Zhang M, Li T, Cui C, Song X, Chang J. Stereoselective Sequential Spirocyclopropanation/Cloke-Wilson Rearrangement Reactions for Synthesis of trans-β,γ-Disubstituted γ-Butyrolactones Using Alkylidene Meldrum's Acid and Benzyl Halides. J Org Chem 2020; 85:2266-2276. [PMID: 31920086 DOI: 10.1021/acs.joc.9b02978] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The stereoselective sequential spirocyclopropanation/Cloke-Wilson rearrangement reactions have been developed to synthesize γ-butyrolactones using alkylidene Meldrum's acids and benzyl halides. The DBU-promoted spirocyclopropanation was carried out efficiently at room temperature to generate trans-isomeric spirocyclopropyl Meldrum's acid, and the following stereospecific thermal decarboxylative Cloke-Wilson rearrangement afforded trans-γ-butyrolactones. A variety of aromatic and aliphatic Meldrum's acid derived olefins and benzyl halides were tolerated. Various trans-β,γ-disubstituted γ-butyrolactones were produced with moderate to good overall yields from 46 to 96% and excellent diastereoselectivities.
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Affiliation(s)
- Minli Zhang
- College of Chemistry , Zhengzhou University , No. 100 Science Avenue , Zhengzhou 450001 , P. R. China
| | - Tong Li
- College of Chemistry , Zhengzhou University , No. 100 Science Avenue , Zhengzhou 450001 , P. R. China
| | - Chaoxing Cui
- College of Chemistry , Zhengzhou University , No. 100 Science Avenue , Zhengzhou 450001 , P. R. China
| | - Xixi Song
- College of Chemistry , Zhengzhou University , No. 100 Science Avenue , Zhengzhou 450001 , P. R. China
| | - Junbiao Chang
- College of Chemistry , Zhengzhou University , No. 100 Science Avenue , Zhengzhou 450001 , P. R. China
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