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Recent Advances in Asymmetric Synthesis of Pyrrolidine-Based Organocatalysts and Their Application: A 15-Year Update. Molecules 2023; 28:molecules28052234. [PMID: 36903480 PMCID: PMC10005811 DOI: 10.3390/molecules28052234] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2023] [Revised: 02/21/2023] [Accepted: 02/24/2023] [Indexed: 03/05/2023] Open
Abstract
In 1971, chemists from Hoffmann-La Roche and Schering AG independently discovered a new asymmetric intramolecular aldol reaction catalyzed by the natural amino acid proline, a transformation now known as the Hajos-Parrish-Eder-Sauer-Wiechert reaction. These remarkable results remained forgotten until List and Barbas reported in 2000 that L-proline was also able to catalyze intermolecular aldol reactions with non-negligible enantioselectivities. In the same year, MacMillan reported on asymmetric Diels-Alder cycloadditions which were efficiently catalyzed by imidazolidinones deriving from natural amino acids. These two seminal reports marked the birth of modern asymmetric organocatalysis. A further important breakthrough in this field happened in 2005, when Jørgensen and Hayashi independently proposed the use of diarylprolinol silyl ethers for the asymmetric functionalization of aldehydes. During the last 20 years, asymmetric organocatalysis has emerged as a very powerful tool for the facile construction of complex molecular architectures. Along the way, a deeper knowledge of organocatalytic reaction mechanisms has been acquired, allowing for the fine-tuning of the structures of privileged catalysts or proposing completely new molecular entities that are able to efficiently catalyze these transformations. This review highlights the most recent advances in the asymmetric synthesis of organocatalysts deriving from or related to proline, starting from 2008.
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Ormandyová K, Bilka S, Mečiarová M, Šebesta R. Bifunctional Thio/Squaramide Catalyzed Stereoselective Michael Additions of Aldehydes to Nitroalkenes towards Synthesis of Chiral Pyrrolidines. ChemistrySelect 2019. [DOI: 10.1002/slct.201902652] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Kristína Ormandyová
- Department of Organic ChemistryFaculty of Natural SciencesComenius University in Bratislava Mlynská dolina Ilkovičova 6 842 15 Bratislava Slovakia
| | - Stanislav Bilka
- Department of Organic ChemistryFaculty of Natural SciencesComenius University in Bratislava Mlynská dolina Ilkovičova 6 842 15 Bratislava Slovakia
| | - Mária Mečiarová
- Department of Organic ChemistryFaculty of Natural SciencesComenius University in Bratislava Mlynská dolina Ilkovičova 6 842 15 Bratislava Slovakia
| | - Radovan Šebesta
- Department of Organic ChemistryFaculty of Natural SciencesComenius University in Bratislava Mlynská dolina Ilkovičova 6 842 15 Bratislava Slovakia
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3
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Guo C, Saifuddin M, Saravanan T, Sharifi M, Poelarends GJ. Biocatalytic Asymmetric Michael Additions of Nitromethane to α,β-Unsaturated Aldehydes via Enzyme-bound Iminium Ion Intermediates. ACS Catal 2019; 9:4369-4373. [PMID: 31080691 PMCID: PMC6503466 DOI: 10.1021/acscatal.9b00780] [Citation(s) in RCA: 44] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2019] [Revised: 04/09/2019] [Indexed: 11/29/2022]
Abstract
The enzyme 4-oxalocrotonate tautomerase (4-OT) exploits an N-terminal proline as main catalytic residue to facilitate several promiscuous C-C bond-forming reactions via enzyme-bound enamine intermediates. Here we show that the active site of this enzyme can give rise to further synthetically useful catalytic promiscuity. Specifically, the F50A mutant of 4-OT was found to efficiently promote asymmetric Michael additions of nitromethane to various α,β-unsaturated aldehydes to give γ-nitroaldehydes, important precursors to biologically active γ-aminobutyric acids. High conversions, high enantiocontrol, and good isolated product yields were achieved. The reactions likely proceed via iminium ion intermediates formed between the catalytic Pro-1 residue and the α,β-unsaturated aldehydes. In addition, a cascade of three 4-OT(F50A)-catalyzed reactions followed by an enzymatic oxidation step enables assembly of γ-nitrocarboxylic acids from three simple building blocks in one pot. Our results bridge organo- and biocatalysis, and they emphasize the potential of enzyme promiscuity for the preparation of important chiral synthons.
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Affiliation(s)
- Chao Guo
- Department of Chemical and Pharmaceutical Biology, Groningen Research Institute of Pharmacy, University of Groningen, Antonius Deusinglaan 1, 9713 AV Groningen, The Netherlands
| | - Mohammad Saifuddin
- Department of Chemical and Pharmaceutical Biology, Groningen Research Institute of Pharmacy, University of Groningen, Antonius Deusinglaan 1, 9713 AV Groningen, The Netherlands
| | - Thangavelu Saravanan
- Department of Chemical and Pharmaceutical Biology, Groningen Research Institute of Pharmacy, University of Groningen, Antonius Deusinglaan 1, 9713 AV Groningen, The Netherlands
| | - Masih Sharifi
- Department of Chemical and Pharmaceutical Biology, Groningen Research Institute of Pharmacy, University of Groningen, Antonius Deusinglaan 1, 9713 AV Groningen, The Netherlands
| | - Gerrit J. Poelarends
- Department of Chemical and Pharmaceutical Biology, Groningen Research Institute of Pharmacy, University of Groningen, Antonius Deusinglaan 1, 9713 AV Groningen, The Netherlands
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4
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Molecular Structures of Enantiomerically-Pure (S)-2-(Triphenylsilyl)- and (S)-2-(Methyldiphenylsilyl)pyrrolidinium Salts. INORGANICS 2017. [DOI: 10.3390/inorganics5040088] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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5
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van der Meer JY, Poddar H, Baas BJ, Miao Y, Rahimi M, Kunzendorf A, van Merkerk R, Tepper PG, Geertsema EM, Thunnissen AMWH, Quax WJ, Poelarends GJ. Using mutability landscapes of a promiscuous tautomerase to guide the engineering of enantioselective Michaelases. Nat Commun 2016; 7:10911. [PMID: 26952338 PMCID: PMC4786785 DOI: 10.1038/ncomms10911] [Citation(s) in RCA: 67] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2015] [Accepted: 02/02/2016] [Indexed: 01/24/2023] Open
Abstract
The Michael-type addition reaction is widely used in organic synthesis for carbon–carbon bond formation. However, biocatalytic methodologies for this type of reaction are scarce, which is related to the fact that enzymes naturally catalysing carbon–carbon bond-forming Michael-type additions are rare. A promising template to develop new biocatalysts for carbon–carbon bond formation is the enzyme 4-oxalocrotonate tautomerase, which exhibits promiscuous Michael-type addition activity. Here we present mutability landscapes for the expression, tautomerase and Michael-type addition activities, and enantioselectivity of 4-oxalocrotonate tautomerase. These maps of neutral, beneficial and detrimental amino acids for each residue position and enzyme property provide detailed insight into sequence–function relationships. This offers exciting opportunities for enzyme engineering, which is illustrated by the redesign of 4-oxalocrotonate tautomerase into two enantiocomplementary ‘Michaelases'. These ‘Michaelases' catalyse the asymmetric addition of acetaldehyde to various nitroolefins, providing access to both enantiomers of γ-nitroaldehydes, which are important precursors for pharmaceutically active γ-aminobutyric acid derivatives. The Michael-type addition reaction is used for carbon-carbon bond formation; however biocatalytic methods for this reaction are rare. Here, the authors generate and exploit mutability landscapes of 4-oxalocrotonate tautomerase to direct the redesign of this promiscuous enzyme into enantio-complementary Michaelases.
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Affiliation(s)
- Jan-Ytzen van der Meer
- Department of Pharmaceutical Biology, Groningen Research Institute of Pharmacy, University of Groningen, Antonius Deusinglaan 1, Groningen 9713 AV, The Netherlands
| | - Harshwardhan Poddar
- Department of Pharmaceutical Biology, Groningen Research Institute of Pharmacy, University of Groningen, Antonius Deusinglaan 1, Groningen 9713 AV, The Netherlands
| | - Bert-Jan Baas
- Department of Pharmaceutical Biology, Groningen Research Institute of Pharmacy, University of Groningen, Antonius Deusinglaan 1, Groningen 9713 AV, The Netherlands
| | - Yufeng Miao
- Department of Pharmaceutical Biology, Groningen Research Institute of Pharmacy, University of Groningen, Antonius Deusinglaan 1, Groningen 9713 AV, The Netherlands
| | - Mehran Rahimi
- Department of Pharmaceutical Biology, Groningen Research Institute of Pharmacy, University of Groningen, Antonius Deusinglaan 1, Groningen 9713 AV, The Netherlands
| | - Andreas Kunzendorf
- Department of Pharmaceutical Biology, Groningen Research Institute of Pharmacy, University of Groningen, Antonius Deusinglaan 1, Groningen 9713 AV, The Netherlands
| | - Ronald van Merkerk
- Department of Pharmaceutical Biology, Groningen Research Institute of Pharmacy, University of Groningen, Antonius Deusinglaan 1, Groningen 9713 AV, The Netherlands
| | - Pieter G Tepper
- Department of Pharmaceutical Biology, Groningen Research Institute of Pharmacy, University of Groningen, Antonius Deusinglaan 1, Groningen 9713 AV, The Netherlands
| | - Edzard M Geertsema
- Department of Pharmaceutical Biology, Groningen Research Institute of Pharmacy, University of Groningen, Antonius Deusinglaan 1, Groningen 9713 AV, The Netherlands
| | - Andy-Mark W H Thunnissen
- Department of Biophysical Chemistry, Groningen Biomolecular Sciences and Biotechnology Institute, University of Groningen, Nijenborgh 7, Groningen 9747 AG, The Netherlands
| | - Wim J Quax
- Department of Pharmaceutical Biology, Groningen Research Institute of Pharmacy, University of Groningen, Antonius Deusinglaan 1, Groningen 9713 AV, The Netherlands
| | - Gerrit J Poelarends
- Department of Pharmaceutical Biology, Groningen Research Institute of Pharmacy, University of Groningen, Antonius Deusinglaan 1, Groningen 9713 AV, The Netherlands
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Kim SM, Kim YS, Kim DW, Rios R, Yang JW. Acetaldehyde: A Small Organic Molecule with Big Impact on Organocatalytic Reactions. Chemistry 2015; 22:2214-34. [PMID: 26667963 DOI: 10.1002/chem.201503960] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2015] [Indexed: 11/11/2022]
Abstract
Stereocontrolled formation of carbon-carbon and carbon-heteroatom bonds through asymmetric organocatalysis is a formidable challenge for modern synthetic chemistry. Among the most significant contributions to this field are the transformations involving the use of acetaldehyde or α-heteroatom-substituted acetaldehydes for constructing valuable synthons (e.g., amino acid derivatives and hydroxycarbonyl). In this Minireview, versatile (enantioselective) organocatalytic transformations are discussed.
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Affiliation(s)
- Sun Min Kim
- Department of Energy Science, Sungkyunkwan University, 2066 Seobu-ro, Jangan-gu, Suwon, Gyeonggi-do, 440-746, Korea
| | - Young Sug Kim
- Department of Energy Science, Sungkyunkwan University, 2066 Seobu-ro, Jangan-gu, Suwon, Gyeonggi-do, 440-746, Korea
| | - Dong Wan Kim
- Department of Energy Science, Sungkyunkwan University, 2066 Seobu-ro, Jangan-gu, Suwon, Gyeonggi-do, 440-746, Korea
| | - Ramon Rios
- Faculty of Natural and Environmental Science, University of Southampton, Highfield Campus, Southampton, SO17 1BJ, UK.
| | - Jung Woon Yang
- Department of Energy Science, Sungkyunkwan University, 2066 Seobu-ro, Jangan-gu, Suwon, Gyeonggi-do, 440-746, Korea.
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Abstract
![]()
Cyclic amines such as 1,2,3,4-tetrahydroisoquinoline
undergo regiodivergent
annulation reactions with 4-nitrobutyraldehydes. These redox-neutral
transformations enable the asymmetric synthesis of highly substituted
polycyclic ring systems in just two steps from commercial materials.
The utility of this process is illustrated in a rapid synthesis of
(−)-protoemetinol. Computational studies provide mechanistic
insights and implicate the elimination of acetic acid from an ammonium
nitronate intermediate as the rate-determining step.
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Affiliation(s)
- YoungKu Kang
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey , Piscataway, New Jersey 08854, United States
| | - Weijie Chen
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey , Piscataway, New Jersey 08854, United States
| | - Martin Breugst
- Department für Chemie, Universität zu Köln , Greinstraße 4, 50939 Köln, Germany
| | - Daniel Seidel
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey , Piscataway, New Jersey 08854, United States
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8
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Zhang Q, Cui X, Chen L, Liu H, Wu Y. Syntheses of Chiral Ferrocenophanes and Their Application to Asymmetric Catalysis. European J Org Chem 2014. [DOI: 10.1002/ejoc.201402985] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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9
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Jeong W, Kim J, Park J, Rhee YH. Stereoselective Synthesis of Highly Substituted α-Silylamines from Silylmethyl Azides under Ru Catalysis. European J Org Chem 2014. [DOI: 10.1002/ejoc.201403200] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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10
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Erdmann H, An F, Mayer P, Ofial AR, Lakhdar S, Mayr H. Structures and Reactivities of 2-Trityl- and 2-(Triphenylsilyl)pyrrolidine-Derived Enamines: Evidence for Negative Hyperconjugation with the Trityl Group. J Am Chem Soc 2014; 136:14263-9. [DOI: 10.1021/ja508065e] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Hannes Erdmann
- Department
Chemie, Ludwig-Maximilians-Universität München, Butenandtstrasse
5-13, 81377 München, Germany
| | - Feng An
- Department
Chemie, Ludwig-Maximilians-Universität München, Butenandtstrasse
5-13, 81377 München, Germany
| | - Peter Mayer
- Department
Chemie, Ludwig-Maximilians-Universität München, Butenandtstrasse
5-13, 81377 München, Germany
| | - Armin R. Ofial
- Department
Chemie, Ludwig-Maximilians-Universität München, Butenandtstrasse
5-13, 81377 München, Germany
| | - Sami Lakhdar
- Department
Chemie, Ludwig-Maximilians-Universität München, Butenandtstrasse
5-13, 81377 München, Germany
- Laboratoire
de Chimie Moléculaire et Thio-organique, UMR CNRS 6507, 6 Boulevard
Maréchal Juin, 14050 Caen, France
| | - Herbert Mayr
- Department
Chemie, Ludwig-Maximilians-Universität München, Butenandtstrasse
5-13, 81377 München, Germany
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11
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Meng XL, Liu T, Sun ZW, Wang JC, Peng FZ, Shao ZH. Asymmetric catalytic conjugate addition of acetaldehyde to nitrodienynes/nitroenynes: applications to the syntheses of (+)-α-lycorane and chiral β-alkynyl acids. Org Lett 2014; 16:3044-7. [PMID: 24811051 DOI: 10.1021/ol501158b] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
The catalytic enantioselective conjugate addition of acetaldehyde to polyconjugated substrates, nitrodienynes and nitroenynes, has been accomplished using organocatalysis. Various functionalized 1,3-enynes and propargylic compounds were obtained in moderate to good yields with high enantioselectivity. The synthetic utilities of the conjugate addition reactions have been highlighted in the concise total synthesis of (+)-α-lycorane and the metal-free synthesis of chiral β-alkynyl acids.
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Affiliation(s)
- Xue-Ling Meng
- Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, School of Chemical Science and Technology, Yunnan University , Kunming, Yunnan 650091, P. R. China
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12
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Geertsema EM, Miao Y, Tepper PG, de Haan P, Zandvoort E, Poelarends GJ. Biocatalytic Michael-Type Additions of Acetaldehyde to Nitroolefins with the Proline-Based Enzyme 4-Oxalocrotonate Tautomerase Yielding Enantioenriched γ-Nitroaldehydes. Chemistry 2013; 19:14407-10. [DOI: 10.1002/chem.201302351] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2013] [Indexed: 12/26/2022]
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13
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Fan X, Rodríguez-Escrich C, Sayalero S, Pericàs MA. Paraldehyde as an Acetaldehyde Precursor in Asymmetric Michael Reactions Promoted by Site-Isolated Incompatible Catalysts. Chemistry 2013; 19:10814-7. [DOI: 10.1002/chem.201302087] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2013] [Indexed: 11/10/2022]
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14
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Petruzziello D, Stenta M, Mazzanti A, Cozzi PG. A Rational Approach Towards a New Ferrocenyl Pyrrolidine for Stereoselective Enamine Catalysis. Chemistry 2013; 19:7696-700. [DOI: 10.1002/chem.201300959] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2013] [Indexed: 11/10/2022]
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15
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GAN LIHUA, ZHOU JIN, GUO XIAO. THE REACTION MECHANISMS OF ALDEHYDES AND NITROSTYRENE CATALYZED BY A CHIRAL SILYLATED PYRROLIDINE CATALYST. JOURNAL OF THEORETICAL & COMPUTATIONAL CHEMISTRY 2013. [DOI: 10.1142/s0219633613500041] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The asymmetric Michael reaction of aldehydes and nitrostyrene catalyzed by a new (S)-tertbutyl-diphenyl-silyl-pyrrolidine catalyst has been investigated by using density functional theory calculations. The Re face of the enamine is effectively shielded, because of the bulky 2-substituent group on the pyrrolidine ring. For acetaldehyde, there are two different conformers of enamines. Based on the two conformers of enamines, four different reaction pathways have been considered. The calculated enantiomeric excess value is 80.27% in favor of the (R)-configuration product. For propanal, eight different reaction pathways have been considered and the eight corresponding transition states have been located. The calculated enantiomeric excess value is 98.96% in favor of the (2S, 3R)-configuration product. These calculated results are in good agreement with the experimental observations. In addition, the calculations also show that both the used solvent and the enamines play important roles in determining the stereochemical outcome of the product.
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Affiliation(s)
- LI-HUA GAN
- School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, P. R. China
| | - JIN ZHOU
- School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, P. R. China
| | - XIAO GUO
- School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, P. R. China
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16
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Chen J, Geng ZC, Li N, Huang XF, Pan FF, Wang XW. Organocatalytic Asymmetric Michael Addition of Aliphatic Aldehydes to Indolylnitroalkenes: Access to Contiguous Stereogenic Tryptamine Precursors. J Org Chem 2013; 78:2362-72. [DOI: 10.1021/jo3024945] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Jian Chen
- Key Laboratory
of Organic Synthesis of Jiangsu Province,
College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, People’s
Republic of China
| | - Zhi-Cong Geng
- Key Laboratory
of Organic Synthesis of Jiangsu Province,
College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, People’s
Republic of China
| | - Ning Li
- Key Laboratory
of Organic Synthesis of Jiangsu Province,
College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, People’s
Republic of China
| | - Xiao-Fei Huang
- Key Laboratory
of Organic Synthesis of Jiangsu Province,
College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, People’s
Republic of China
| | - Feng-Feng Pan
- Key Laboratory
of Organic Synthesis of Jiangsu Province,
College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, People’s
Republic of China
| | - Xing-Wang Wang
- Key Laboratory
of Organic Synthesis of Jiangsu Province,
College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, People’s
Republic of China
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Xu K, Zhang S, Hu Y, Zha Z, Wang Z. Asymmetric Michael Reaction Catalyzed by Proline Lithium Salt: Efficient Synthesis ofL-Proline and Isoindoloisoquinolinone Derivatives. Chemistry 2013; 19:3573-8. [DOI: 10.1002/chem.201202409] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2012] [Revised: 12/31/2012] [Indexed: 12/29/2022]
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18
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Miao Y, Geertsema EM, Tepper PG, Zandvoort E, Poelarends GJ. Promiscuous catalysis of asymmetric Michael-type additions of linear aldehydes to β-nitrostyrene by the proline-based enzyme 4-oxalocrotonate tautomerase. Chembiochem 2013; 14:191-4. [PMID: 23303727 DOI: 10.1002/cbic.201200676] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2012] [Indexed: 11/09/2022]
Abstract
Exploiting catalytic promiscuity: The proline-based enzyme 4-oxalocrotonate tautomerase (4-OT) promiscuously catalyzes asymmetric Michael-type additions of linear aldehydes--ranging from acetaldehyde to octanal--to trans-β-nitrostyrene in aqueous solvent. The presence of 1.4 mol% of 4-OT effected formation of the anticipated γ-nitroaldehydes in fair to good yields with dr values of up to 93:7 and ee values of up to 81 %.
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Affiliation(s)
- Yufeng Miao
- Department of Pharmaceutical Biology, Groningen Research Institute of Pharmacy, University of Groningen, Antonius Deusinglaan 1, 9713 AV Groningen, The Netherlands
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19
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Asymmetric Michael Reaction of Acetaldehyde with Nitroolefins Catalyzed by Highly Water-Compatible Organocatalysts in Aqueous Media. Adv Synth Catal 2012. [DOI: 10.1002/adsc.201200215] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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20
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Min T, Fettinger JC, Franz AK. Enantiocontrol with a Hydrogen-bond Directing Pyrrolidinylsilanol Catalyst. ACS Catal 2012. [DOI: 10.1021/cs300290j] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Taewoo Min
- Department
of Chemistry, University of California, One Shields Avenue, Davis, California 95616,
United States
| | - James C. Fettinger
- Department
of Chemistry, University of California, One Shields Avenue, Davis, California 95616,
United States
| | - Annaliese K. Franz
- Department
of Chemistry, University of California, One Shields Avenue, Davis, California 95616,
United States
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21
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Beemelmanns C, Husmann R, Whelligan DK, Özçubukçu S, Bolm C. Planar-Chiral Bis-silanols and Diols as H-Bonding Asymmetric Organocatalysts. European J Org Chem 2012. [DOI: 10.1002/ejoc.201200548] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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22
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