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Son EC, Kim SY, Kim SG. Squaramide-Catalyzed Asymmetric Intramolecular Oxa-Michael Reaction of α,β-Unsaturated Carbonyls Containing Benzyl Alcohol: Construction of Chiral 1-Substituted Phthalans. J Org Chem 2021; 86:6826-6839. [PMID: 33904749 DOI: 10.1021/acs.joc.1c00715] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Organocatalytic enantioselective intramolecular oxa-Michael reactions of benzyl alcohol bearing α,β-unsaturated carbonyls as Michael acceptors are presented herein. Using cinchona squaramide-based organocatalyst, enones as well as α,β-unsaturated esters containing benzyl alcohol provided their corresponding 1,3-dihydroisobenzofuranyl-1-methylene ketones and 1,3-dihydroisobenzofuranyl-1-methylene esters in excellent yields with high enantioselectivities. In addition, enantioenriched 1,3-dihydroisobenzofuranyl-1-methylene ketone could be obtained from the Wittig/oxa-Michael reaction cascade of 1,3-dihydro-2-benzofuran-1-ol.
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Affiliation(s)
- Eun Chae Son
- 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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2
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Zhang K, Lu LQ, Xiao WJ. Recent advances in the catalytic asymmetric alkylation of stabilized phosphorous ylides. Chem Commun (Camb) 2019; 55:8716-8721. [PMID: 31140487 DOI: 10.1039/c9cc02831e] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
The Wittig reaction is a reliable method for synthesizing alkenes from phosphorous ylides (P-ylides) and carbonyls, and is thus widely applied in medicine and pharmaceutical production. Among them, asymmetric Wittig reactions using chiral P-ylides are believed to be a conventional pathway towards chiral alkenes. Obviously, the key of this transformation is the efficient construction of chiral P-ylides. Over the past decade, the coupling of the in situ generated chiral P-ylides through the catalytic asymmetric alkylation of easily available P-ylides and the subsequent Wittig reaction with carbonyls has already been achieved, allowing the efficient and selective synthesis of versatile chiral alkenes. This review highlights these impressive advances according to the catalysis type, and the general mechanisms and stereochemical inductions are briefly discussed as well. We hope this article will be a useful reference and inspiration for those who are exploring new methods and new applications of chiral P-ylides.
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Affiliation(s)
- Kai Zhang
- CCNU-uOttawa Joint Research Centre, Key Laboratory of Pesticide & Chemical Biology, Ministry of Education, College of Chemistry, Central China Normal University, 152 Luoyu Road, Wuhan, Hubei 430079, China.
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Boratyński PJ, Zielińska-Błajet M, Skarżewski J. Cinchona Alkaloids-Derivatives and Applications. THE ALKALOIDS. CHEMISTRY AND BIOLOGY 2019; 82:29-145. [PMID: 30850032 DOI: 10.1016/bs.alkal.2018.11.001] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Major Cinchona alkaloids quinine, quinidine, cinchonine, and cinchonidine are available chiral natural compounds (chiral pool). Unlike many other natural products, these alkaloids are available in multiple diastereomeric forms which are separated on an industrial scale. The introduction discusses in short conformational equilibria, traditional separation scheme, biosynthesis, and de novo chemical syntheses. The second section concerns useful chemical applications of the alkaloids as chiral recognition agents and effective chiral catalysts. Besides the Sharpless ethers and quaternary ammonium salts (chiral PTC), the most successful bifunctional organocatalysts are based on 9-amino derivatives: thioureas and squaramides. The third section reports the main transformations of Cinchona alkaloids. This covers reactions of the 9-hydroxyl group with the retention or inversion of configuration. Specific Cinchona rearrangements enlarging [2.2.2]bicycle of quinuclidine to [3.2.2] products are connected to the 9-OH substitution. The syntheses of numerous esterification and etherification products are described, including many examples of bi-Cinchona alkaloid ethers. Further derivatives comprise 9-N-substituted compounds. The amino group is introduced via an azido function with the inversion of configuration at the stereogenic center C9. The 9-epi-amino-alkaloids provide imines, amides, imides, thioureas, and squaramides. The syntheses of 9-carbon-, 9-sulfur-, and 9-selenium-substituted derivatives are discussed. Oxidation of the hydroxyl group of any alkaloid gives ketones, which can be selectively reduced, reacted with Grignard reagents, or subjected to the Corey-Chaykovsky reaction. The alkaloids were also partially degraded by splitting C4'-C9 or N1-C8 bonds. In order to immobilize Cinchona alkaloids the transformations of the 3-vinyl group were often exploited. Finally, miscellaneous functionalizations of quinuclidine, quinoline, and examples of various metal complexes of the alkaloids are considered.
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Affiliation(s)
| | | | - Jacek Skarżewski
- Department of Organic Chemistry, Wrocław University of Technology, Wrocław, Poland.
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Lee J, Chen DYK. A Local-Desymmetrization-Based Divergent Synthesis of Quinine and Quinidine. Angew Chem Int Ed Engl 2018; 58:488-493. [PMID: 30394634 DOI: 10.1002/anie.201811530] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2018] [Indexed: 12/14/2022]
Abstract
Herein we report a novel synthetic entry to the legendary quinuclidine natural products quinine and quinidine. The developed strategy is based on the use of a symmetrical and nonstereogenic precursor to access quinine and quinidine through a "local-desymmetrization" approach, in stark contrast conceptually to the preparation of stereodefined disubstituted piperidines (or their acyclic precursors) as featured in all past syntheses. The developed strategy also provided quinine and quinidine derivatives that could not be readily obtained through previous total syntheses or by modification of the naturally occurring substances.
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Affiliation(s)
- Jaehoo Lee
- Department of Chemistry, Seoul National University, Gwanak-1 Gwanak-ro, Gwanak-gu, Seoul, 08826, South Korea
| | - David Y-K Chen
- Department of Chemistry, Seoul National University, Gwanak-1 Gwanak-ro, Gwanak-gu, Seoul, 08826, South Korea
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Lee J, Chen DYK. A Local-Desymmetrization-Based Divergent Synthesis of Quinine and Quinidine. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201811530] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Jaehoo Lee
- Department of Chemistry; Seoul National University; Gwanak-1 Gwanak-ro, Gwanak-gu Seoul 08826 South Korea
| | - David Y.-K. Chen
- Department of Chemistry; Seoul National University; Gwanak-1 Gwanak-ro, Gwanak-gu Seoul 08826 South Korea
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Wang L, Yang D, Li D, Liu X, Wang P, Wang K, Zhu H, Bai L, Wang R. The Important Role of the Byproduct Triphenylphosphine Oxide in the Magnesium(II)-Catalyzed Enantioselective Reaction of Hemiacetals and Phosphorus Ylides. Angew Chem Int Ed Engl 2018; 57:9088-9092. [DOI: 10.1002/anie.201804177] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2018] [Indexed: 01/02/2023]
Affiliation(s)
- Linqing Wang
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province; School of Basic Medical Sciences; Lanzhou University; Lanzhou 730000 P. R. China
| | - Dongxu Yang
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province; School of Basic Medical Sciences; Lanzhou University; Lanzhou 730000 P. R. China
| | - Dan Li
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province; School of Basic Medical Sciences; Lanzhou University; Lanzhou 730000 P. R. China
| | - Xihong Liu
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province; School of Basic Medical Sciences; Lanzhou University; Lanzhou 730000 P. R. China
| | - Pengxin Wang
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province; School of Basic Medical Sciences; Lanzhou University; Lanzhou 730000 P. R. China
| | - Kezhou Wang
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province; School of Basic Medical Sciences; Lanzhou University; Lanzhou 730000 P. R. China
| | - Haiyong Zhu
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province; School of Basic Medical Sciences; Lanzhou University; Lanzhou 730000 P. R. China
| | - Lutao Bai
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province; School of Basic Medical Sciences; Lanzhou University; Lanzhou 730000 P. R. China
| | - Rui Wang
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province; School of Basic Medical Sciences; Lanzhou University; Lanzhou 730000 P. R. China
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Wang L, Yang D, Li D, Liu X, Wang P, Wang K, Zhu H, Bai L, Wang R. The Important Role of the Byproduct Triphenylphosphine Oxide in the Magnesium(II)-Catalyzed Enantioselective Reaction of Hemiacetals and Phosphorus Ylides. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201804177] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Linqing Wang
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province; School of Basic Medical Sciences; Lanzhou University; Lanzhou 730000 P. R. China
| | - Dongxu Yang
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province; School of Basic Medical Sciences; Lanzhou University; Lanzhou 730000 P. R. China
| | - Dan Li
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province; School of Basic Medical Sciences; Lanzhou University; Lanzhou 730000 P. R. China
| | - Xihong Liu
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province; School of Basic Medical Sciences; Lanzhou University; Lanzhou 730000 P. R. China
| | - Pengxin Wang
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province; School of Basic Medical Sciences; Lanzhou University; Lanzhou 730000 P. R. China
| | - Kezhou Wang
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province; School of Basic Medical Sciences; Lanzhou University; Lanzhou 730000 P. R. China
| | - Haiyong Zhu
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province; School of Basic Medical Sciences; Lanzhou University; Lanzhou 730000 P. R. China
| | - Lutao Bai
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province; School of Basic Medical Sciences; Lanzhou University; Lanzhou 730000 P. R. China
| | - Rui Wang
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province; School of Basic Medical Sciences; Lanzhou University; Lanzhou 730000 P. R. China
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Synthesis of novel quinine analogs and evaluation of their effects on Trypanosoma cruzi. Future Med Chem 2018; 10:391-408. [PMID: 29380636 DOI: 10.4155/fmc-2017-0184] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
AIM Chagas disease is a tropical disease caused by the hemoflagellate protozoan Trypanosoma cruzi. There is no vaccine for Chagas disease and available drugs (e.g., benznidazole) are effective only during the acute phase, displaying a variable curative activity in the established chronic form of the disease. New leads with high efficacy and better toxicity profiles are urgently required. Materials & methods: A library of novel quinine derivatives was synthesized using Heck chemistry and evaluated against the various developmental forms of T. cruzi. RESULTS AND CONCLUSION Several novel quinine analogs with trypanocidal activity have been identified with the para-nitro-substituted derivative displaying a submicromolar IC50, which is 83-times lower than quinine and three-times lower than benznidazole. Transmission electron microscopy analysis demonstrated that these compounds induced a marked vacuolization of the kinetoplast of intracellular amastigotes and cell-derived trypomastigotes.
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Reddy RR, Gudup SS, Ghorai P. Organocatalytic, Enantioselective Synthesis of Cyclohexadienone Containing Hindered Spirocyclic Ethers through an Oxidative Dearomatization/Oxa-Michael Addition Sequence. Angew Chem Int Ed Engl 2016; 55:15115-15119. [DOI: 10.1002/anie.201607039] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2016] [Revised: 08/24/2016] [Indexed: 12/21/2022]
Affiliation(s)
- Reddy Rajasekhar Reddy
- Department of Chemistry; Indian Institute of Science Education and Research (IISER) Bhopal; Bhopal By-pass Road, Bhauri Bhopal- 462066 India
| | - Satish Sonbarao Gudup
- Department of Chemistry; Indian Institute of Science Education and Research (IISER) Bhopal; Bhopal By-pass Road, Bhauri Bhopal- 462066 India
| | - Prasanta Ghorai
- Department of Chemistry; Indian Institute of Science Education and Research (IISER) Bhopal; Bhopal By-pass Road, Bhauri Bhopal- 462066 India
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Reddy RR, Gudup SS, Ghorai P. Organocatalytic, Enantioselective Synthesis of Cyclohexadienone Containing Hindered Spirocyclic Ethers through an Oxidative Dearomatization/Oxa-Michael Addition Sequence. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201607039] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Reddy Rajasekhar Reddy
- Department of Chemistry; Indian Institute of Science Education and Research (IISER) Bhopal; Bhopal By-pass Road, Bhauri Bhopal- 462066 India
| | - Satish Sonbarao Gudup
- Department of Chemistry; Indian Institute of Science Education and Research (IISER) Bhopal; Bhopal By-pass Road, Bhauri Bhopal- 462066 India
| | - Prasanta Ghorai
- Department of Chemistry; Indian Institute of Science Education and Research (IISER) Bhopal; Bhopal By-pass Road, Bhauri Bhopal- 462066 India
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11
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Breman AC, van der Heijden G, van Maarseveen JH, Ingemann S, Hiemstra H. Synthetic and Organocatalytic Studies of Quinidine Analogues with Ring-Size Modifications in the Quinuclidine Moiety. Chemistry 2016; 22:14247-56. [PMID: 27531315 DOI: 10.1002/chem.201601917] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2016] [Indexed: 11/07/2022]
Abstract
Six highly enantiopure analogues of [2.2.2] were synthesized with five- or seven-membered rings in the (original) quinuclidine skeleton. Five of these compounds were prepared through epoxide opening by a secondary cyclic amine, providing the nor- and homoquinuclidine moieties through five- and six-membered ring formation. This method failed in the case of seven-membered ring formation, so for that particular ring size a different synthetic route starting from 3-quinuclidone was applied. The six novel analogues were examined as organocatalysts in four asymmetric conjugate addition reactions and the results compared with those of known cinchona alkaloid catalysts. This study shows that modification of the quinuclidine ring can have a substantial influence on catalyst activity and enantioselectivity. To acquire more insight into the characteristics of the new catalysts, the pKaH values were determined by means of fluorescence spectroscopy. Furthermore, relative reaction rates of conjugate thiol additions reactions catalyzed by these quinidine analogues were measured through polarimetry.
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Affiliation(s)
- Arjen C Breman
- Van 't Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904, 1098 XH, Amsterdam, The Netherlands
| | - Gydo van der Heijden
- Van 't Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904, 1098 XH, Amsterdam, The Netherlands
| | - Jan H van Maarseveen
- Van 't Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904, 1098 XH, Amsterdam, The Netherlands
| | - Steen Ingemann
- Van 't Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904, 1098 XH, Amsterdam, The Netherlands
| | - Henk Hiemstra
- Van 't Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904, 1098 XH, Amsterdam, The Netherlands.
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Kobayashi Y, Kuramoto R, Takemoto Y. Catalytic asymmetric formal synthesis of beraprost. Beilstein J Org Chem 2015; 11:2654-60. [PMID: 26734111 PMCID: PMC4685892 DOI: 10.3762/bjoc.11.285] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2015] [Accepted: 12/02/2015] [Indexed: 12/26/2022] Open
Abstract
The first catalytic asymmetric synthesis of the key intermediate for beraprost has been achieved through an enantioselective intramolecular oxa-Michael reaction of an α,β-unsaturated amide mediated by a newly developed benzothiadiazine catalyst. The Weinreb amide moiety and bromo substituent of the Michael adduct were utilized for the C-C bond formations to construct the scaffold. All four contiguous stereocenters of the tricyclic core were controlled via Rh-catalyzed stereoselective C-H insertion and the subsequent reduction from the convex face.
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Affiliation(s)
- Yusuke Kobayashi
- Graduate School of Pharmaceutical Sciences, Kyoto University, Yoshida, Sakyo-ku, Kyoto 606-8501, Japan
| | - Ryuta Kuramoto
- Graduate School of Pharmaceutical Sciences, Kyoto University, Yoshida, Sakyo-ku, Kyoto 606-8501, Japan
| | - Yoshiji Takemoto
- Graduate School of Pharmaceutical Sciences, Kyoto University, Yoshida, Sakyo-ku, Kyoto 606-8501, Japan
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Raveendra B, Maity S, Das BG, Ghorai P. Organocatalytic, Enantioselective Synthesis of 1- and 3-Substituted Isochromans via Intramolecular Oxa-Michael Reaction of Alkoxyboronate: Synthesis of (+)-Sonepiprazole. J Org Chem 2015; 80:7008-18. [PMID: 26102523 DOI: 10.1021/acs.joc.5b00719] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
The enantioselective oxa-Michael reaction of alkoxyboronate strategy was demonstrated to provide a new and practical route to enantioriched 1- and 3-substituted isochromans using a chiral bifunctional organocatalyst. Furthermore, this methodology was extended to the enantioselective synthesis of (+)-sonepiprazole, a dopamine receptor antagonist.
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Affiliation(s)
- Barnala Raveendra
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Indore By-pass Road, Bhauri, Bhopal-462066, India
| | - Sanjay Maity
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Indore By-pass Road, Bhauri, Bhopal-462066, India
| | - Braja Gopal Das
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Indore By-pass Road, Bhauri, Bhopal-462066, India
| | - Prasanta Ghorai
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Indore By-pass Road, Bhauri, Bhopal-462066, India
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Xu D, Dai L, Catellani M, Motti E, Della Ca’ N, Zhou Z. A novel enantioselective synthesis of 6H-dibenzopyran derivatives by combined palladium/norbornene and cinchona alkaloid catalysis. Org Biomol Chem 2015; 13:2260-3. [DOI: 10.1039/c4ob02551b] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Chiral dibenzopyran derivatives were obtained by cinchona alkaloid, as organocatalyst, in combination, for the first time, with palladium/norbornene catalytic system.
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Affiliation(s)
- Di Xu
- School of Chemical Engineering and the Environment
- Beijing Institute of Technology
- Beijing 100081
- PR China
| | - Li Dai
- School of Chemical Engineering and the Environment
- Beijing Institute of Technology
- Beijing 100081
- PR China
| | - Marta Catellani
- Dipartimento di Chimica and CIRCC
- Università di Parma
- Parco Area delle Scienze
- 43124 Parma
- Italy
| | - Elena Motti
- Dipartimento di Chimica and CIRCC
- Università di Parma
- Parco Area delle Scienze
- 43124 Parma
- Italy
| | - Nicola Della Ca’
- Dipartimento di Chimica and CIRCC
- Università di Parma
- Parco Area delle Scienze
- 43124 Parma
- Italy
| | - Zhiming Zhou
- School of Chemical Engineering and the Environment
- Beijing Institute of Technology
- Beijing 100081
- PR China
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Raveendra B, Das BG, Ghorai P. Organocatalytic, enantioselective, intramolecular oxa-Michael reaction of alkoxyboronate: a new strategy for enantioenriched 1-substituted 1,3-dihydroisobenzofurans. Org Lett 2014; 16:5580-3. [PMID: 25337660 DOI: 10.1021/ol502614n] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
An unprecedented strategy for the synthesis of enantioenriched 1-substituted 1,3-dihydroisobenzofurans via an enantioselective oxa-Michael reaction of o-alkoxyboronate containing chalcone (II) has been accomplished employing cinchona alkaloid based squaramide bifunctional organocatalyst in the presence of proton source. The corresponding alkoxyboronate intermediates have been readily prepared in situ from o-formyl chalcones using neutral borane as hydride source and a tertiary amine moiety which is a counterpart of the catalyst.
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Affiliation(s)
- Barnala Raveendra
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal , Bhauri, Bhopal 462066, India
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Teixeira C, Vale N, Pérez B, Gomes A, Gomes JRB, Gomes P. "Recycling" classical drugs for malaria. Chem Rev 2014; 114:11164-220. [PMID: 25329927 DOI: 10.1021/cr500123g] [Citation(s) in RCA: 85] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Cátia Teixeira
- Centro de Investigação em Química da Universidade do Porto, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade do Porto , P-4169-007 Porto, Portugal.,CICECO, Departamento de Química, Universidade de Aveiro , P-3810-193 Aveiro, Portugal
| | - Nuno Vale
- Centro de Investigação em Química da Universidade do Porto, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade do Porto , P-4169-007 Porto, Portugal
| | - Bianca Pérez
- Centro de Investigação em Química da Universidade do Porto, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade do Porto , P-4169-007 Porto, Portugal
| | - Ana Gomes
- Centro de Investigação em Química da Universidade do Porto, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade do Porto , P-4169-007 Porto, Portugal
| | - José R B Gomes
- CICECO, Departamento de Química, Universidade de Aveiro , P-3810-193 Aveiro, Portugal
| | - Paula Gomes
- Centro de Investigação em Química da Universidade do Porto, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade do Porto , P-4169-007 Porto, Portugal
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Youn SW, Song HS, Park JH. Asymmetric Domino Multicatalysis for the Synthesis of 3-Substituted Phthalides: Cinchonine/NHC Cooperative System. Org Lett 2014; 16:1028-31. [DOI: 10.1021/ol5000617] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- So Won Youn
- Department of Chemistry and
Research Institute for Natural Sciences, Hanyang University, Seoul 133-791, Korea
| | - Hyoung Sub Song
- Department of Chemistry and
Research Institute for Natural Sciences, Hanyang University, Seoul 133-791, Korea
| | - Jong Hyub Park
- Department of Chemistry and
Research Institute for Natural Sciences, Hanyang University, Seoul 133-791, Korea
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Miyaji R, Asano K, Matsubara S. Asymmetric chroman synthesis via an intramolecular oxy-Michael addition by bifunctional organocatalysts. Org Biomol Chem 2014; 12:119-22. [DOI: 10.1039/c3ob41938j] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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19
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Kobayashi Y, Taniguchi Y, Hayama N, Inokuma T, Takemoto Y. A Powerful Hydrogen-Bond-Donating Organocatalyst for the Enantioselective Intramolecular Oxa-Michael Reaction of α,β-Unsaturated Amides and Esters. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201305492] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
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20
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Kobayashi Y, Taniguchi Y, Hayama N, Inokuma T, Takemoto Y. A Powerful Hydrogen-Bond-Donating Organocatalyst for the Enantioselective Intramolecular Oxa-Michael Reaction of α,β-Unsaturated Amides and Esters. Angew Chem Int Ed Engl 2013; 52:11114-8. [DOI: 10.1002/anie.201305492] [Citation(s) in RCA: 89] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2013] [Indexed: 11/10/2022]
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Hintermann L, Ackerstaff J, Boeck F. Inner Workings of a Cinchona Alkaloid Catalyzed Oxa-Michael Cyclization: Evidence for a Concerted Hydrogen-Bond-Network Mechanism. Chemistry 2013; 19:2311-21. [DOI: 10.1002/chem.201203505] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2012] [Indexed: 11/09/2022]
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22
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Zhang JW, Cai Q, Gu Q, Shi XX, You SL. Enantioselective synthesis of benzofurans and benzoxazines via an olefin cross-metathesis–intramolecular oxo-Michael reaction. Chem Commun (Camb) 2013; 49:7750-2. [DOI: 10.1039/c3cc43937b] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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23
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Wu W, Li X, Huang H, Yuan X, Lu J, Zhu K, Ye J. Asymmetric Intramolecular Oxa-Michael Reactions of Cyclohexadienones Catalyzed by a Primary Amine Salt. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201206977] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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24
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Wu W, Li X, Huang H, Yuan X, Lu J, Zhu K, Ye J. Asymmetric Intramolecular Oxa-Michael Reactions of Cyclohexadienones Catalyzed by a Primary Amine Salt. Angew Chem Int Ed Engl 2012; 52:1743-7. [DOI: 10.1002/anie.201206977] [Citation(s) in RCA: 101] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2012] [Revised: 09/16/2012] [Indexed: 11/05/2022]
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25
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Stewart GW, Shevlin M, Yamagata ADG, Gibson AW, Keen SP, Scott JP. Enantioselective Synthesis of β-Aryloxycarboxylic Esters via Asymmetric Hydrogenation of β-Aryloxy-α,β-Unsaturated Esters. Org Lett 2012; 14:5440-3. [DOI: 10.1021/ol302518y] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Gavin W. Stewart
- Global Process Chemistry, Merck Sharp and Dohme Research Laboratories, Hertford Road, Hoddesdon, Hertfordshire, EN11 9BU, United Kingdom, and Global Process Chemistry, Merck Sharp and Dohme Research Laboratories, Rahway, New Jersey 07065, United States
| | - Michael Shevlin
- Global Process Chemistry, Merck Sharp and Dohme Research Laboratories, Hertford Road, Hoddesdon, Hertfordshire, EN11 9BU, United Kingdom, and Global Process Chemistry, Merck Sharp and Dohme Research Laboratories, Rahway, New Jersey 07065, United States
| | - Adam D. Gammack Yamagata
- Global Process Chemistry, Merck Sharp and Dohme Research Laboratories, Hertford Road, Hoddesdon, Hertfordshire, EN11 9BU, United Kingdom, and Global Process Chemistry, Merck Sharp and Dohme Research Laboratories, Rahway, New Jersey 07065, United States
| | - Andrew W. Gibson
- Global Process Chemistry, Merck Sharp and Dohme Research Laboratories, Hertford Road, Hoddesdon, Hertfordshire, EN11 9BU, United Kingdom, and Global Process Chemistry, Merck Sharp and Dohme Research Laboratories, Rahway, New Jersey 07065, United States
| | - Stephen P. Keen
- Global Process Chemistry, Merck Sharp and Dohme Research Laboratories, Hertford Road, Hoddesdon, Hertfordshire, EN11 9BU, United Kingdom, and Global Process Chemistry, Merck Sharp and Dohme Research Laboratories, Rahway, New Jersey 07065, United States
| | - Jeremy P. Scott
- Global Process Chemistry, Merck Sharp and Dohme Research Laboratories, Hertford Road, Hoddesdon, Hertfordshire, EN11 9BU, United Kingdom, and Global Process Chemistry, Merck Sharp and Dohme Research Laboratories, Rahway, New Jersey 07065, United States
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26
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China Raju B, Saidachary G, Ashok Kumar J. Wittig homologation of 2-(chloromethyl)-2H-chromen-2-ol derivatives: a new facile synthesis of substituted 2,3-dihydrobenzoxepine-4-carboxylates. Tetrahedron 2012. [DOI: 10.1016/j.tet.2012.05.047] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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27
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Dinio T, Gorka AP, McGinniss A, Roepe PD, Morgan JB. Investigating the activity of quinine analogues versus chloroquine resistant Plasmodium falciparum. Bioorg Med Chem 2012; 20:3292-7. [PMID: 22512909 PMCID: PMC3345081 DOI: 10.1016/j.bmc.2012.03.042] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2012] [Revised: 03/16/2012] [Accepted: 03/21/2012] [Indexed: 11/23/2022]
Abstract
Plasmodium falciparum, the deadliest malarial parasite species, has developed resistance against nearly all man-made antimalarial drugs within the past century. However, quinine (QN), the first antimalarial drug, remains efficacious worldwide. Some chloroquine resistant (CQR) P. falciparum strains or isolates show mild cross resistance to QN, but many do not. Further optimization of QN may provide a well-tolerated therapy with improved activity versus CQR malaria. Thus, using the Heck reaction, we have pursued a structure-activity relationship study, including vinyl group modifications of QN. Certain derivatives show good antiplasmodial activity in QN-resistant and QN-sensitive strains, with lower IC(50) values relative to QN.
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Affiliation(s)
- Theresa Dinio
- Department of Chemistry and Biochemistry, University of North Carolina, Wilmington, Dobo Hall, 601 S. College Road, Wilmington NC 28403
| | - Alexander P. Gorka
- Department of Chemistry, Department of Biochemistry and Cellular and Molecular Biology, and Center for Infectious Disease, Georgetown University, 37 and O Streets, Washington DC 20057
| | - Andrew McGinniss
- Department of Chemistry and Biochemistry, University of North Carolina, Wilmington, Dobo Hall, 601 S. College Road, Wilmington NC 28403
| | - Paul D. Roepe
- Department of Chemistry, Department of Biochemistry and Cellular and Molecular Biology, and Center for Infectious Disease, Georgetown University, 37 and O Streets, Washington DC 20057
| | - Jeremy B. Morgan
- Department of Chemistry and Biochemistry, University of North Carolina, Wilmington, Dobo Hall, 601 S. College Road, Wilmington NC 28403
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Abstract
Products of a novel iminium-catalyzed oxa-Michael addition undergo a kinetic resolution by a subsequent enamine-catalyzed intermolecular reaction. This is a rare example of kinetic resolution by enamine catalysis and the first organocascade kinetic resolution. This resolution produces enantioenriched 2,6-cis-tetrahydropyrans and, notably, cascade products with absolute and relative configurations normally not observed using this diphenyl prolinol silyl ether. This resolution thus provides new insight into asymmetric induction in reactions employing this catalyst.
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Affiliation(s)
- Patrick G McGarraugh
- Department of Chemistry, Brooklyn College and the City University of New York, 2900 Bedford Avenue, Brooklyn, New York 11210, USA
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29
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Mahajan N, Koul S, Razdan TK. Bismuth triflate-L(−)-proline catalyzed synthesis of chiral 2,5-diaryl-2,3-dihydropyrano[2,3-b]quinolin-4-ones. J Heterocycl Chem 2011. [DOI: 10.1002/jhet.762] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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30
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Wang HF, Xiao H, Wang XW, Zhao G. Tandem intramolecular oxa-Michael addition/decarboxylation reaction catalyzed by bifunctional cinchona alkaloids: facile synthesis of chiral flavanone derivatives. Tetrahedron 2011. [DOI: 10.1016/j.tet.2011.05.088] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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31
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Hernández-Torres G, Carreño MC, Urbano A, Colobert F. Stereoselective Synthesis of 2H-Chromans by Reductive Deoxygenation of Differently Substituted 2-Sulfinylmethylchroman-2-ols. European J Org Chem 2011. [DOI: 10.1002/ejoc.201100436] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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32
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Recent applications of Cinchona alkaloids and their derivatives as catalysts in metal-free asymmetric synthesis. Tetrahedron 2011. [DOI: 10.1016/j.tet.2010.12.050] [Citation(s) in RCA: 171] [Impact Index Per Article: 13.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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33
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Feng Z, Zeng M, Xu Q, You S. Asymmetric intramolecular oxa-Michael addition of activated α,β-unsaturated ketones by chiral N-triflyl phosphoramide. ACTA ACUST UNITED AC 2010. [DOI: 10.1007/s11434-009-3735-x] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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34
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Gu Q, Rong ZQ, Zheng C, You SL. Desymmetrization of Cyclohexadienones via Brønsted Acid-Catalyzed Enantioselective Oxo-Michael Reaction. J Am Chem Soc 2010; 132:4056-7. [DOI: 10.1021/ja100207s] [Citation(s) in RCA: 220] [Impact Index Per Article: 15.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Qing Gu
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Lu, Shanghai 200032, China
| | - Zi-Qiang Rong
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Lu, Shanghai 200032, China
| | - Chao Zheng
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Lu, Shanghai 200032, China
| | - Shu-Li You
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Lu, Shanghai 200032, China
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35
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Núñez MG, García P, Moro RF, Díez D. Asymmetric organocatalytic synthesis of six-membered oxygenated heterocycles. Tetrahedron 2010. [DOI: 10.1016/j.tet.2009.12.045] [Citation(s) in RCA: 88] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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36
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Wang HF, Cui HF, Chai Z, Li P, Zheng CW, Yang YQ, Zhao G. Asymmetric Synthesis of Fluorinated Flavanone Derivatives by an Organocatalytic Tandem Intramolecular Oxa-Michael Addition/Electrophilic Fluorination Reaction by Using Bifunctional Cinchona Alkaloids. Chemistry 2009; 15:13299-303. [PMID: 19899096 DOI: 10.1002/chem.200902303] [Citation(s) in RCA: 70] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Hai-Feng Wang
- Key Laboratory of Synthetic Chemistry of Natural Substances, Shanghai Institute of Organic Chemistry, 345 LingLing Lu, Shanghai, 200032, China
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37
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Reyes E, Talavera G, Vicario J, Badía D, Carrillo L. Enantioselective Organocatalytic Domino Oxa-Michael/Aldol/Hemiacetalization: Synthesis of Polysubstituted Furofuranes Containing Four Stereocenters. Angew Chem Int Ed Engl 2009. [DOI: 10.1002/ange.200901333] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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38
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Reyes E, Talavera G, Vicario JL, Badía D, Carrillo L. Enantioselective Organocatalytic Domino Oxa-Michael/Aldol/Hemiacetalization: Synthesis of Polysubstituted Furofuranes Containing Four Stereocenters. Angew Chem Int Ed Engl 2009; 48:5701-4. [PMID: 19557777 DOI: 10.1002/anie.200901333] [Citation(s) in RCA: 90] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Efraím Reyes
- Departamento de Química Orgánica II, Facultad de Ciencia y Tecnología, Universidad del País Vasco/Euskal Herriko Unibertsitatea, P.O. Box 644, 48080 Bilbao, Spain
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39
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Wang L, Liu X, Dong Z, Fu X, Feng X. Asymmetric Intramolecular Oxa-Michael Addition of Activated α,β-Unsaturated Ketones Catalyzed by a ChiralN,N′-Dioxide Nickel(II) Complex: Highly Enantioselective Synthesis of Flavanones. Angew Chem Int Ed Engl 2008. [DOI: 10.1002/ange.200803326] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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40
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Wang L, Liu X, Dong Z, Fu X, Feng X. Asymmetric Intramolecular Oxa-Michael Addition of Activated α,β-Unsaturated Ketones Catalyzed by a ChiralN,N′-Dioxide Nickel(II) Complex: Highly Enantioselective Synthesis of Flavanones. Angew Chem Int Ed Engl 2008; 47:8670-3. [DOI: 10.1002/anie.200803326] [Citation(s) in RCA: 109] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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41
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Busygin I, Nieminen V, Taskinen A, Sinkkonen J, Toukoniitty E, Sillanpää R, Murzin DY, Leino R. A Combined NMR, DFT, and X-ray Investigation of Some Cinchona Alkaloid O-Ethers. J Org Chem 2008; 73:6559-69. [DOI: 10.1021/jo8008462] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Igor Busygin
- Laboratories of Organic Chemistry and Industrial Chemistry and Reaction Engineering, Åbo Akademi University, FI-20500 Turku, Finland, Department of Chemistry, University of Turku, FI-20014 Turku, Finland, and Department of Chemistry, University of Jyväskylä, FI-40351 Jyväskylä, Finland
| | - Ville Nieminen
- Laboratories of Organic Chemistry and Industrial Chemistry and Reaction Engineering, Åbo Akademi University, FI-20500 Turku, Finland, Department of Chemistry, University of Turku, FI-20014 Turku, Finland, and Department of Chemistry, University of Jyväskylä, FI-40351 Jyväskylä, Finland
| | - Antti Taskinen
- Laboratories of Organic Chemistry and Industrial Chemistry and Reaction Engineering, Åbo Akademi University, FI-20500 Turku, Finland, Department of Chemistry, University of Turku, FI-20014 Turku, Finland, and Department of Chemistry, University of Jyväskylä, FI-40351 Jyväskylä, Finland
| | - Jari Sinkkonen
- Laboratories of Organic Chemistry and Industrial Chemistry and Reaction Engineering, Åbo Akademi University, FI-20500 Turku, Finland, Department of Chemistry, University of Turku, FI-20014 Turku, Finland, and Department of Chemistry, University of Jyväskylä, FI-40351 Jyväskylä, Finland
| | - Esa Toukoniitty
- Laboratories of Organic Chemistry and Industrial Chemistry and Reaction Engineering, Åbo Akademi University, FI-20500 Turku, Finland, Department of Chemistry, University of Turku, FI-20014 Turku, Finland, and Department of Chemistry, University of Jyväskylä, FI-40351 Jyväskylä, Finland
| | - Reijo Sillanpää
- Laboratories of Organic Chemistry and Industrial Chemistry and Reaction Engineering, Åbo Akademi University, FI-20500 Turku, Finland, Department of Chemistry, University of Turku, FI-20014 Turku, Finland, and Department of Chemistry, University of Jyväskylä, FI-40351 Jyväskylä, Finland
| | - Dmitry Yu. Murzin
- Laboratories of Organic Chemistry and Industrial Chemistry and Reaction Engineering, Åbo Akademi University, FI-20500 Turku, Finland, Department of Chemistry, University of Turku, FI-20014 Turku, Finland, and Department of Chemistry, University of Jyväskylä, FI-40351 Jyväskylä, Finland
| | - Reko Leino
- Laboratories of Organic Chemistry and Industrial Chemistry and Reaction Engineering, Åbo Akademi University, FI-20500 Turku, Finland, Department of Chemistry, University of Turku, FI-20014 Turku, Finland, and Department of Chemistry, University of Jyväskylä, FI-40351 Jyväskylä, Finland
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42
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Saito N, Ryoda A, Nakanishi W, Kumamoto T, Ishikawa T. Guanidine-Catalyzed Asymmetric Synthesis of 2,2-Disubstituted Chromane Skeletons by Intramolecular Oxa-Michael Addition. European J Org Chem 2008. [DOI: 10.1002/ejoc.200800089] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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43
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Zhao XL, Liu L, Chen YJ, Wang D. Three-Component Barbier Allylation-Friedel-Crafts Alkylation Promoted by BuPyCl/SnCl2·2H2O: Application to the Synthesis of 4-(Substituted phenyl)chromans. CHINESE J CHEM 2007. [DOI: 10.1002/cjoc.200790244] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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44
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Hintermann L, Schmitz M, Englert U. Nucleophilic Addition of Organometallic Reagents to Cinchona Alkaloids: Simple Access to Diverse Architectures. Angew Chem Int Ed Engl 2007; 46:5164-7. [PMID: 17534988 DOI: 10.1002/anie.200701341] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Lukas Hintermann
- Institut für Organische Chemie, RWTH Aachen, Landoltweg 1, 52074 Aachen, Germany.
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45
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Hintermann L, Schmitz M, Englert U. Nucleophilic Addition of Organometallic Reagents to Cinchona Alkaloids: Simple Access to Diverse Architectures. Angew Chem Int Ed Engl 2007. [DOI: 10.1002/ange.200701341] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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46
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Ma B, Parkinson JL, Castle SL. Novel Cinchona alkaloid derived ammonium salts as catalysts for the asymmetric synthesis of beta-hydroxy alpha-amino acids via aldol reactions. Tetrahedron Lett 2007; 48:2083-2086. [PMID: 18350108 DOI: 10.1016/j.tetlet.2007.01.132] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Using the cinchonidine-derived phase-transfer catalyst de veloped by Park and Jew as a lead structure, we have prepared novel chiral ammonium salts and investigated their efficacy for the preparation of beta-hydroxy alpha-amino acids via asymmetric aldol reactions. The modifications were performed at C3 of the cinchonidine nucleus and include dimers as well as catalysts possessing electron-deficient alkyne and alkene moieties. Some of the new catalysts yielded improvements relative to the Park-Jew catalyst in the aldol reaction.
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Affiliation(s)
- Bing Ma
- Department of Chemistry and Biochemistry, Brigham Young University, Provo, UT 84602, USA
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47
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48
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Asymmetric synthesis of activated cyclopropanes catalyzed by cinchonidine as a chiral Brønsted base. Tetrahedron Lett 2006. [DOI: 10.1016/j.tetlet.2006.10.085] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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49
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Thornqvist V, Manner S, Frejd T. Enantioselective synthesis of bridgehead hydroxyl bicyclo[2.2.2]octane derivatives via asymmetric allylindation. ACTA ACUST UNITED AC 2006. [DOI: 10.1016/j.tetasy.2005.12.026] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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