1
|
Huang GT, Yu JSK. Catalytic role of the enol ether intermediate in the intramolecular Stetter reaction: a computational perspective. Phys Chem Chem Phys 2024; 26:11833-11853. [PMID: 38567403 DOI: 10.1039/d3cp06051a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/04/2024]
Abstract
The intramolecular Stetter reaction catalyzed by a carbene is investigated by density functional theory (DFT) calculations and kinetic simulations. Catalyst 1 first reacts with aldehyde 2 to give the primary adduct (PA). The PA undergoes the intramolecular oxa-Michael reaction to irreversibly generate enol ether intermediate 9. The conversion of the enol ether to the Breslow intermediate (BI) requires the assistance of a base such as the PA. The next step involves formation of a carbon-carbon bond through the Michael addition, and expulsion of the catalyst generates the Stetter product 7. Calculations show that the catalytic cycle is composed of two irreversible processes: the first one involves the exergonic formation of the enol ether intermediate, while the second one is the conversion of the enol ether to the final product. Kinetic simulations using initial concentrations of [1]0 = 0.005 M and [2]0 = 0.025 M demonstrate that under a steady-state condition, 35% of the catalyst rests on the state of the enol ether (0.0018 M). The catalyst resting state therefore consists of the unbound form (the free catalyst) and its bound form (the enol ether species). According to variable time normalization analysis, the reaction exhibits a second-order dependence (first order in catalyst and first order in substrate), which agrees with experiments. The oxa-Michael reaction to form the enol ether is identified to be turnover limiting in the intramolecular Stetter reaction, which rationalizes the observed electronic effect of the Michael acceptor on the reactivity, as well as the measured isotope effect with respect to the aldehydic proton/deuteron. The base that participates in the BI formation has a significant effect on the build-up of the resting state 9 and the active catalyst concentration. In addition, the thermodynamic stability of the enol ether is found to depend on the tether length between the aromatic aldehyde and the Michael acceptor, as well as the chemical nature of the carbene catalyst. The favorability for the oxa-Michael reaction is therefore suggested to govern the reactivity of the intramolecular Stetter transformation.
Collapse
Affiliation(s)
- Gou-Tao Huang
- Department of Biological Science and Technology, National Yang Ming Chiao Tung University, Hsinchu City 300, Taiwan.
| | - Jen-Shiang K Yu
- Department of Biological Science and Technology, National Yang Ming Chiao Tung University, Hsinchu City 300, Taiwan.
- Institute of Bioinformatics and Systems Biology, National Yang Ming Chiao Tung University, Hsinchu City 300, Taiwan
- Center for Intelligent Drug Systems and Smart Bio-devices (IDS2B), National Yang Ming Chiao Tung University, Hsinchu City 300, Taiwan
| |
Collapse
|
2
|
Kumar R, Singh FV, Takenaga N, Dohi T. Asymmetric Direct/Stepwise Dearomatization Reactions Involving Hypervalent Iodine Reagents. Chem Asian J 2021; 17:e202101115. [PMID: 34817125 DOI: 10.1002/asia.202101115] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2021] [Revised: 11/19/2021] [Indexed: 01/06/2023]
Abstract
A remarkable growth in hypervalent iodine-mediated oxidative transformations as stoichiometric reagents as well as catalysts has been well-documented due to their excellent properties, such as mildness, easy handling, high selectivity, environmentally friendly nature, and high stability. This review aims at highlighting the asymmetric oxidative dearomatization reactions involving hypervalent iodine compounds. The present article summarizes asymmetric intra- and intermolecular dearomatization reactions using chiral hypervalent iodine reagents/catalysts as well as hypervalent iodine-mediated dearomatization reactions followed by desymmetrization.
Collapse
Affiliation(s)
- Ravi Kumar
- Department of Chemistry, J. C. Bose University of Science & Technology, YMCA Faridabad, NH-2, Sector-6, Mathura Road, Faridabad, Haryana, 121006, India
| | - Fateh V Singh
- Chemistry Division, School of Advanced Sciences (SAS), Vellore Institute of Technology - Chennai, Chennai, 600127, Tamil Nadu, India
| | - Naoko Takenaga
- Faculty of Pharmacy, Meijo University, 150 Yagotoyama, Tempaku-ku, Nagoya, 468-8503, Japan
| | - Toshifumi Dohi
- College of Pharmaceutical Sciences, Ritsumeikan University, 1-1-1 Nojihigashi, Kusatsu, Shiga, 525-0058, Japan
| |
Collapse
|
3
|
Li D, Zhang M, Yang Y, Peng T, Yang D, Gao W, Wang R. Desymmetrization Process by Mg(II)-Catalyzed Intramolecular Vinylogous Michael Reaction. Org Lett 2020; 22:9229-9233. [DOI: 10.1021/acs.orglett.0c03417] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Dan Li
- School of Pharmaceutical Sciences, Capital Medical University, Beijing 100069, China
| | - Minmin Zhang
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province, Lanzhou University, Lanzhou 730000, China
| | - Yuling Yang
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province, Lanzhou University, Lanzhou 730000, China
| | - Tianyu Peng
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province, Lanzhou University, Lanzhou 730000, China
| | - Dongxu Yang
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province, Lanzhou University, Lanzhou 730000, China
| | - Wei Gao
- School of Pharmaceutical Sciences, Capital Medical University, Beijing 100069, China
| | - Rui Wang
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province, Lanzhou University, Lanzhou 730000, China
| |
Collapse
|
4
|
|
5
|
Hsu DS, Cheng CY. Construction of Spirofused Tricyclic Frameworks by NHC-Catalyzed Intramolecular Stetter Reaction of a Benzaldehyde Tether with a Cyclic Enone. J Org Chem 2019; 84:10832-10842. [PMID: 31397574 DOI: 10.1021/acs.joc.9b01403] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Various benzaldehyde tethers with a cyclic enone were prepared from commercially available 2-hydroxybenzaldehydes via a three-step sequence involving triflate formation, Sonogashira cross-coupling, and regioselective hydrogenation. These substrates were then exposed to an N-heterocyclic carbene, whereupon intramolecular Stetter reaction proceeded smoothly to give various spirofused tricyclic 1,4-diketones in 30-87% yields. Furaldehyde and nicotinaldehyde derivatives also participated in the reaction under the Stetter conditions.
Collapse
Affiliation(s)
- Day-Shin Hsu
- Department of Chemistry and Biochemistry , National Chung Cheng University , Minhsiung 621 , Taiwan
| | - Chiao-Yun Cheng
- Department of Chemistry and Biochemistry , National Chung Cheng University , Minhsiung 621 , Taiwan
| |
Collapse
|
6
|
Yang WL, Sun ZT, Zhang J, Li Z, Deng WP. Enantioselective synthesis of 3-amino-hydrobenzofuran-2,5-diones via Cu(i)-catalyzed intramolecular conjugate addition of imino esters. Org Chem Front 2019. [DOI: 10.1039/c8qo01335g] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The copper-catalyzed enantioselective intramolecular conjugate addition of imino esters for desymmetrization of cyclohexadienones was described, providing access to enantioenriched 3-amino-hydrobenzofuran-2,5-diones.
Collapse
Affiliation(s)
- Wu-Lin Yang
- Shanghai Key Laboratory of Chemical Biology
- School of Pharmacy
- East China University of Science and Technology
- Shanghai 200237
- China
| | - Zhong-Tao Sun
- Shanghai Key Laboratory of New Drug Design
- School of Pharmacy
- East China University of Science and Technology
- Shanghai 200237
- China
| | - Jian Zhang
- Shanghai Key Laboratory of New Drug Design
- School of Pharmacy
- East China University of Science and Technology
- Shanghai 200237
- China
| | - Zhong Li
- Shanghai Key Laboratory of Chemical Biology
- School of Pharmacy
- East China University of Science and Technology
- Shanghai 200237
- China
| | - Wei-Ping Deng
- Shanghai Key Laboratory of New Drug Design
- School of Pharmacy
- East China University of Science and Technology
- Shanghai 200237
- China
| |
Collapse
|
7
|
Li K, Jin Z, Chan WL, Lu Y. Enantioselective Construction of Bicyclic Pyran and Hydrindane Scaffolds via Intramolecular Rauhut–Currier Reactions Catalyzed by Thiourea-Phosphines. ACS Catal 2018. [DOI: 10.1021/acscatal.8b02706] [Citation(s) in RCA: 48] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Kaizhi Li
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore
| | - Zhichao Jin
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore
| | - Wai-Lun Chan
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore
| | - Yixin Lu
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore
- National University of Singapore (Suzhou) Research Institute, 377 Lin Quan Street, Suzhou Industrial Park, Suzhou, Jiangsu P. R. China, 215123
| |
Collapse
|
8
|
Shu T, Zhao L, Li S, Chen XY, von Essen C, Rissanen K, Enders D. Asymmetric Synthesis of Spirocyclic β-Lactams through Copper-Catalyzed Kinugasa/Michael Domino Reactions. Angew Chem Int Ed Engl 2018; 57:10985-10988. [DOI: 10.1002/anie.201806931] [Citation(s) in RCA: 58] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2018] [Indexed: 12/19/2022]
Affiliation(s)
- Tao Shu
- Institute of Organic Chemistry; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
| | - Long Zhao
- Institute of Organic Chemistry; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
| | - Sun Li
- Institute of Organic Chemistry; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
| | - Xiang-Yu Chen
- Institute of Organic Chemistry; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
| | - Carolina von Essen
- Department of Chemistry; University of Jyväskylä; P. O. Box 35 40014 Jyväskylä Finland
| | - Kari Rissanen
- Department of Chemistry; University of Jyväskylä; P. O. Box 35 40014 Jyväskylä Finland
| | - Dieter Enders
- Institute of Organic Chemistry; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
| |
Collapse
|
9
|
Shu T, Zhao L, Li S, Chen XY, von Essen C, Rissanen K, Enders D. Asymmetric Synthesis of Spirocyclic β-Lactams through Copper-Catalyzed Kinugasa/Michael Domino Reactions. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201806931] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Tao Shu
- Institute of Organic Chemistry; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
| | - Long Zhao
- Institute of Organic Chemistry; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
| | - Sun Li
- Institute of Organic Chemistry; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
| | - Xiang-Yu Chen
- Institute of Organic Chemistry; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
| | - Carolina von Essen
- Department of Chemistry; University of Jyväskylä; P. O. Box 35 40014 Jyväskylä Finland
| | - Kari Rissanen
- Department of Chemistry; University of Jyväskylä; P. O. Box 35 40014 Jyväskylä Finland
| | - Dieter Enders
- Institute of Organic Chemistry; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
| |
Collapse
|
10
|
Bai WJ, Pettus TRR. Synthetic Studies toward the Tetrapetalones: Diastereoselective Construction of a Putative Intermediate. Org Lett 2018; 20:901-904. [PMID: 29381370 DOI: 10.1021/acs.orglett.7b03500] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A strategy toward tetrapetalones was explored including a site-selective ethylenation of the silyl enol ether A to afford a quaternary stereocenter that serves in a stereogenic capacity. Regio- and diastereoselective reactions were observed in conjunction with the oxidative formation of cation B, which included subsequent selective formation of either carbon-oxygen or carbon-carbon bonds at the δ or ζ position on the seven-membered ring. The fourth ring was formed using a Stetter reaction.
Collapse
Affiliation(s)
- Wen-Ju Bai
- Department of Chemistry and Biochemistry, University of California , Santa Barbara, California 93106, United States
| | - Thomas R R Pettus
- Department of Chemistry and Biochemistry, University of California , Santa Barbara, California 93106, United States
| |
Collapse
|
11
|
Shu T, Li S, Chen XY, Liu Q, von Essen C, Rissanen K, Enders D. Asymmetric synthesis of functionalized tetrahydrofluorenones via an NHC-catalyzed homoenolate Michael addition. Chem Commun (Camb) 2018; 54:7661-7664. [DOI: 10.1039/c8cc04145h] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The first example of an N-heterocyclic carbene-catalyzed asymmetric desymmetrization of enal-tethered cyclohexadienones via an intramolecular homoenolate Michael addition/esterification reaction is described.
Collapse
Affiliation(s)
- Tao Shu
- Institute of Organic Chemistry
- RWTH Aachen University
- Landoltweg 1
- 52074 Aachen
- Germany
| | - Sun Li
- Institute of Organic Chemistry
- RWTH Aachen University
- Landoltweg 1
- 52074 Aachen
- Germany
| | - Xiang-Yu Chen
- Institute of Organic Chemistry
- RWTH Aachen University
- Landoltweg 1
- 52074 Aachen
- Germany
| | - Qiang Liu
- Institute of Organic Chemistry
- RWTH Aachen University
- Landoltweg 1
- 52074 Aachen
- Germany
| | | | - Kari Rissanen
- Department of Chemistry
- University of Jyväskylä
- 40014 Jyväskylä
- Finland
| | - Dieter Enders
- Institute of Organic Chemistry
- RWTH Aachen University
- Landoltweg 1
- 52074 Aachen
- Germany
| |
Collapse
|
12
|
Niu Y, Wang N, Muñoz A, Xu J, Zeng H, Rovis T, Lee JK. Experimental and Computational Gas Phase Acidities of Conjugate Acids of Triazolylidene Carbenes: Rationalizing Subtle Electronic Effects. J Am Chem Soc 2017; 139:14917-14930. [PMID: 29039669 DOI: 10.1021/jacs.7b05229] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
In recent years, triazolylidene carbenes have come to the forefront as important organocatalysts for a wide range of reactions. The fundamental properties of these species, however, remain largely unknown. Herein, the gas phase acidities have been measured and calculated for a series of triazolium cations (the conjugate acids of the triazolylidene carbenes) that have not been heretofore examined in vacuo. The results are discussed in the context of these species as catalysts. We find correlations between the gas phase acidity and selectivity in two Umpolung reactions catalyzed by these species; such correlations are the first of their kind. We are able to use these linear correlations to improve reaction enantioselectivity. These results establish the possibility of using these thermochemical properties to predict reactivity in related transformations.
Collapse
Affiliation(s)
- Yijie Niu
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey , New Brunswick, New Jersey 08901, United States
| | - Ning Wang
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey , New Brunswick, New Jersey 08901, United States
| | - Alberto Muñoz
- Department of Chemistry, Columbia University , New York, New York 10027, United States
| | - Jiahui Xu
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey , New Brunswick, New Jersey 08901, United States
| | - Hao Zeng
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey , New Brunswick, New Jersey 08901, United States
| | - Tomislav Rovis
- Department of Chemistry, Columbia University , New York, New York 10027, United States
| | - Jeehiun K Lee
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey , New Brunswick, New Jersey 08901, United States
| |
Collapse
|
13
|
Horwitz MA, Massolo E, Johnson JS. Phosphazene-catalyzed desymmetrization of cyclohexadienones by dithiane addition. Beilstein J Org Chem 2017; 13:762-767. [PMID: 28546832 PMCID: PMC5433211 DOI: 10.3762/bjoc.13.75] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2017] [Accepted: 04/04/2017] [Indexed: 12/26/2022] Open
Abstract
We report a desymmetrization of cyclohexadienones by intramolecular conjugate addition of a tethered dithiane nucleophile. Mild reaction conditions allow the formation of diversely functionalized fused bicyclic lactones. The products participate in facially selective additions from the convex surface, leading to allylic alcohol derivatives.
Collapse
Affiliation(s)
- Matthew A Horwitz
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-3290, USA
| | - Elisabetta Massolo
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-3290, USA
| | - Jeffrey S Johnson
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-3290, USA
| |
Collapse
|
14
|
Yao W, Dou X, Wen S, Wu J, Vittal JJ, Lu Y. Enantioselective desymmetrization of cyclohexadienones via an intramolecular Rauhut-Currier reaction of allenoates. Nat Commun 2016; 7:13024. [PMID: 27698487 PMCID: PMC5059449 DOI: 10.1038/ncomms13024] [Citation(s) in RCA: 84] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2016] [Accepted: 08/25/2016] [Indexed: 12/27/2022] Open
Abstract
The Rauhut–Currier (RC) reaction represents an efficient method for the construction of carbon–carbon bond in organic synthesis. However, the RC reactions involving allenoate substrates are very rare, and in particular, asymmetric intramolecular RC reaction of allenoates is yet to be discovered. Here, we show that the intramolecular RC reaction proceeds smoothly in the presence of 1 mol% β-ICD, and bicyclic lactones are obtained in high yields and with excellent enantiomeric excesses. With the employment of γ-substituted allenoates as racemic precursors, a novel dynamic kinetic resolution of allenes via RC reaction is observed, which allows for facile synthesis of highly enantiomerically enriched allenes. The Rauhut-Currier reaction is a powerful method to form carbon-carbon bonds. Here, the authors report an enantioselective intramolecular variant between alkenes and allenoates, giving access to highly functionalised bicyclic lactones in excellent enantiomeric excess.
Collapse
Affiliation(s)
- Weijun Yao
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore
| | - Xiaowei Dou
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore
| | - Shan Wen
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore
| | - Ji'en Wu
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore
| | - Jagadese J Vittal
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore
| | - Yixin Lu
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore
| |
Collapse
|
15
|
Li Y, Yang S, Wen G, Lin Q, Zhang G, Qiu L, Zhang X, Du G, Fang X. Asymmetric Desymmetrization of 1,3-Diketones via Intramolecular Benzoin Reaction. J Org Chem 2016; 81:2763-9. [DOI: 10.1021/acs.joc.5b02829] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yuanzhen Li
- Key
Laboratory of Coal to Ethylene Glycol and Its Related Technology,
Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, China
| | - Shuang Yang
- Key
Laboratory of Coal to Ethylene Glycol and Its Related Technology,
Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, China
| | - Genfa Wen
- Key
Laboratory of Coal to Ethylene Glycol and Its Related Technology,
Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, China
| | - Qiqiao Lin
- Key
Laboratory of Coal to Ethylene Glycol and Its Related Technology,
Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, China
| | - Guoxiang Zhang
- Key
Laboratory of Coal to Ethylene Glycol and Its Related Technology,
Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, China
| | - Lin Qiu
- Key
Laboratory of Coal to Ethylene Glycol and Its Related Technology,
Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, China
| | - Xiaoyan Zhang
- Key
Laboratory of Coal to Ethylene Glycol and Its Related Technology,
Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, China
| | - Guangfen Du
- Key
Laboratory for Green Processing of Chemical Engineering of Xinjiang
Bingtuan, School of Chemistry and Chemical Engineering, Shihezi University, Shihezi, Xinjiang Uygur Autonomous Region 832000, China
| | - Xinqiang Fang
- Key
Laboratory of Coal to Ethylene Glycol and Its Related Technology,
Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, China
| |
Collapse
|
16
|
Abstract
The preparation, structure, and chemistry of hypervalent iodine compounds are reviewed with emphasis on their synthetic application. Compounds of iodine possess reactivity similar to that of transition metals, but have the advantage of environmental sustainability and efficient utilization of natural resources. These compounds are widely used in organic synthesis as selective oxidants and environmentally friendly reagents. Synthetic uses of hypervalent iodine reagents in halogenation reactions, various oxidations, rearrangements, aminations, C-C bond-forming reactions, and transition metal-catalyzed reactions are summarized and discussed. Recent discovery of hypervalent catalytic systems and recyclable reagents, and the development of new enantioselective reactions using chiral hypervalent iodine compounds represent a particularly important achievement in the field of hypervalent iodine chemistry. One of the goals of this Review is to attract the attention of the scientific community as to the benefits of using hypervalent iodine compounds as an environmentally sustainable alternative to heavy metals.
Collapse
Affiliation(s)
- Akira Yoshimura
- Department of Chemistry and Biochemistry, University of Minnesota Duluth , Duluth, Minnesota 55812, United States
| | - Viktor V Zhdankin
- Department of Chemistry and Biochemistry, University of Minnesota Duluth , Duluth, Minnesota 55812, United States
| |
Collapse
|
17
|
Yu Z, Qi X, Li Y, Liu S, Lan Y. Mechanism, chemoselectivity and enantioselectivity for the rhodium-catalyzed desymmetric synthesis of hydrobenzofurans: a theoretical study. Org Chem Front 2016. [DOI: 10.1039/c5qo00334b] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
A theoretical study of Rhodium-catalyzed desymmetrization of cyclohexadienones.
Collapse
Affiliation(s)
- Zhaoyuan Yu
- School of Chemistry and Chemical Engineering
- Chongqing University
- Chongqing 400044
- P. R. China
| | - Xiaotian Qi
- School of Chemistry and Chemical Engineering
- Chongqing University
- Chongqing 400044
- P. R. China
| | - Yingzi Li
- School of Chemistry and Chemical Engineering
- Chongqing University
- Chongqing 400044
- P. R. China
| | - Song Liu
- School of Chemistry and Chemical Engineering
- Chongqing University
- Chongqing 400044
- P. R. China
| | - Yu Lan
- School of Chemistry and Chemical Engineering
- Chongqing University
- Chongqing 400044
- P. R. China
| |
Collapse
|
18
|
Lin Q, Li Y, Das DK, Zhang G, Zhao Z, Yang S, Fang X. N-Heterocyclic carbene-catalyzed desymmetrization of functionalized 1,4-dienes via Stetter Reaction. Chem Commun (Camb) 2016; 52:6459-62. [DOI: 10.1039/c6cc01011c] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The asymmetric desymmetrization of 1,4-dienes via chiral N-heterocyclic carbene catalyzed Stetter-type umpolung reaction was demonstrated.
Collapse
Affiliation(s)
- Qiqiao Lin
- State Key Laboratory of Structural Chemistry
- Fujian Institute of Research on the Structure of Matter
- Chinese Academy of Sciences
- Fuzhou
- China
| | - Yuanzhen Li
- State Key Laboratory of Structural Chemistry
- Fujian Institute of Research on the Structure of Matter
- Chinese Academy of Sciences
- Fuzhou
- China
| | - Deb Kumar Das
- State Key Laboratory of Structural Chemistry
- Fujian Institute of Research on the Structure of Matter
- Chinese Academy of Sciences
- Fuzhou
- China
| | - Guoxiang Zhang
- State Key Laboratory of Structural Chemistry
- Fujian Institute of Research on the Structure of Matter
- Chinese Academy of Sciences
- Fuzhou
- China
| | - Zhifei Zhao
- State Key Laboratory of Structural Chemistry
- Fujian Institute of Research on the Structure of Matter
- Chinese Academy of Sciences
- Fuzhou
- China
| | - Shuang Yang
- State Key Laboratory of Structural Chemistry
- Fujian Institute of Research on the Structure of Matter
- Chinese Academy of Sciences
- Fuzhou
- China
| | - Xinqiang Fang
- State Key Laboratory of Structural Chemistry
- Fujian Institute of Research on the Structure of Matter
- Chinese Academy of Sciences
- Fuzhou
- China
| |
Collapse
|
19
|
Pantaine L, Coeffard V, Moreau X, Greck C. Enantioselective Desymmetrization of para-Quinamines through an Aminocatalyzed Aza-Michael/Cyclization Cascade Reaction. Org Lett 2015; 17:3674-7. [DOI: 10.1021/acs.orglett.5b01595] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Loïc Pantaine
- Institut Lavoisier Versailles,
UMR CNRS 8180, Université de Versailles-St-Quentin-en-Yvelines, 45 Avenue des États-Unis, 78035 Versailles cedex, France
| | - Vincent Coeffard
- Institut Lavoisier Versailles,
UMR CNRS 8180, Université de Versailles-St-Quentin-en-Yvelines, 45 Avenue des États-Unis, 78035 Versailles cedex, France
| | - Xavier Moreau
- Institut Lavoisier Versailles,
UMR CNRS 8180, Université de Versailles-St-Quentin-en-Yvelines, 45 Avenue des États-Unis, 78035 Versailles cedex, France
| | - Christine Greck
- Institut Lavoisier Versailles,
UMR CNRS 8180, Université de Versailles-St-Quentin-en-Yvelines, 45 Avenue des États-Unis, 78035 Versailles cedex, France
| |
Collapse
|
20
|
Abstract
Cyclohexadienones are versatile platforms for performing asymmetric synthesis as evidenced by the numerous natural product syntheses that exploit their diverse reactivity profile. However, there are few general methods available for the direct asymmetric synthesis of chiral cyclohexadienones. To circumvent this problem, several researchers have developed catalytic asymmetric methods that employ readily available achiral 2,5-cyclohexadienones as substrates. Many of these reactions are desymmetrizations in which one of the enantiotopic alkenes of an achiral dienone is transformed. Others involve selective reaction at one alkene of an unsymmetrically substituted, achiral dienone. This review will cover advances in this area over the last 20 years and the application of these strategies in complex molecule synthesis.
Collapse
Affiliation(s)
- Kyle A Kalstabakken
- Department of Chemistry, University of Minnesota-Twin Cities, 207 Pleasant St SE, Minneapolis, Minnesota 55455, United States
| | - Andrew M Harned
- Department of Chemistry, University of Minnesota-Twin Cities, 207 Pleasant St SE, Minneapolis, Minnesota 55455, United States
| |
Collapse
|
21
|
Bao Y, Kumagai N, Shibasaki M. Design and synthesis of a bis(hydroxyphenyl)diamide bearing a pendant thiazolium unit; application to the catalytic asymmetric intramolecular Stetter reaction. ACTA ACUST UNITED AC 2014. [DOI: 10.1016/j.tetasy.2014.09.010] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
22
|
Han L, Liu C, Zhang W, Shi XX, You SL. Dearomatization of tryptophols via a vanadium-catalyzed asymmetric epoxidation and ring-opening cascade. Chem Commun (Camb) 2014; 50:1231-3. [DOI: 10.1039/c3cc47921h] [Citation(s) in RCA: 74] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
23
|
He ZT, Tian B, Fukui Y, Tong X, Tian P, Lin GQ. Rhodium-Catalyzed Asymmetric Arylative Cyclization ofmeso-1,6-Dienynes Leading to Enantioenrichedcis-Hydrobenzofurans. Angew Chem Int Ed Engl 2013; 52:5314-8. [DOI: 10.1002/anie.201300137] [Citation(s) in RCA: 110] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2013] [Revised: 02/21/2013] [Indexed: 11/06/2022]
|
24
|
He ZT, Tian B, Fukui Y, Tong X, Tian P, Lin GQ. Rhodium-Catalyzed Asymmetric Arylative Cyclization ofmeso-1,6-Dienynes Leading to Enantioenrichedcis-Hydrobenzofurans. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201300137] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
25
|
Lathrop SP, Rovis T. A photoisomerization-coupled asymmetric Stetter reaction: application to the total synthesis of three diastereomers of (-)-cephalimysin A. Chem Sci 2013; 4. [PMID: 24224080 DOI: 10.1039/c3sc22292f] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The total synthesis of 8-epi, 8,9-epi, and 9-epi-(-)-cephalimysin A is described. Our catalytic enantioselective synthesis takes advantage of a novel tandem photoisomerization/Stetter reaction. The approach provides rapid access to the desired spirofuranone lactam core in good yield and excellent enantioselectivity. A late stage oxidation strategy allows for flexible access to three of the four diastereomers of cephalimysin A. Access to the epimers provides further support for the correction of the initially proposed relative stereochemistry of cephalimysin A.
Collapse
Affiliation(s)
- Stephen P Lathrop
- Department of Chemistry, Colorado State University, Fort Collins, Colorado, USA
| | | |
Collapse
|
26
|
|
27
|
|
28
|
Pérez-Vázquez J, Veiga AX, Prado G, Sardina FJ, Paleo MR. Enantioselective Annulation Reactions of Bisenolates Prepared Through Dearomatization Reactions of Aromatic and Heteroaromatic Diesters. European J Org Chem 2011. [DOI: 10.1002/ejoc.201101427] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
29
|
Fang X, Chen X, Lv H, Chi YR. Enantioselective Stetter Reactions of Enals and Modified Chalcones Catalyzed by N-Heterocyclic Carbenes. Angew Chem Int Ed Engl 2011; 50:11782-5. [DOI: 10.1002/anie.201105812] [Citation(s) in RCA: 102] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2011] [Indexed: 11/10/2022]
|
30
|
Fang X, Chen X, Lv H, Chi YR. Enantioselective Stetter Reactions of Enals and Modified Chalcones Catalyzed by N-Heterocyclic Carbenes. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201105812] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
|
31
|
Sisto TJ, Golder MR, Hirst ES, Jasti R. Selective Synthesis of Strained [7]Cycloparaphenylene: An Orange-Emitting Fluorophore. J Am Chem Soc 2011; 133:15800-2. [DOI: 10.1021/ja205606p] [Citation(s) in RCA: 212] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Thomas J. Sisto
- Department of Chemistry and ‡Division of Materials Science and Engineering and Center for Nanoscience and Nanobiotechnology, Boston University, Boston, Massachusetts 02215, United States
| | - Matthew R. Golder
- Department of Chemistry and ‡Division of Materials Science and Engineering and Center for Nanoscience and Nanobiotechnology, Boston University, Boston, Massachusetts 02215, United States
| | - Elizabeth S. Hirst
- Department of Chemistry and ‡Division of Materials Science and Engineering and Center for Nanoscience and Nanobiotechnology, Boston University, Boston, Massachusetts 02215, United States
| | - Ramesh Jasti
- Department of Chemistry and ‡Division of Materials Science and Engineering and Center for Nanoscience and Nanobiotechnology, Boston University, Boston, Massachusetts 02215, United States
| |
Collapse
|
32
|
Abstract
The use of N-heterocyclic carbenes as catalysts for organic transformations has received increased attention in the past 10 years. A discussion of catalyst development and nucleophilic characteristics precedes a description of recent advancements and new reactions using N-heterocyclic carbenes in catalysis.
Collapse
|
33
|
Roche SP, Porco JA. Dearomatization strategies in the synthesis of complex natural products. Angew Chem Int Ed Engl 2011; 50:4068-93. [PMID: 21506209 PMCID: PMC4136767 DOI: 10.1002/anie.201006017] [Citation(s) in RCA: 1006] [Impact Index Per Article: 77.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2010] [Indexed: 11/11/2022]
Abstract
Evolution in the field of the total synthesis of natural products has led to exciting developments over the last decade. Numerous chemoselective and enantioselective methodologies have emerged from total syntheses, resulting in efficient access to many important natural product targets. This Review highlights recent developments concerning dearomatization, a powerful strategy for the total synthesis of architecturally complex natural products wherein planar, aromatic scaffolds are converted to three-dimensional molecular architectures.
Collapse
Affiliation(s)
- Stéphane P. Roche
- Department of Chemistry, Center for Chemical Methodology and Library Development, Boston University 590 Commonwealth Avenue, Boston, MA 02215 (USA)
| | - John A. Porco
- Department of Chemistry, Center for Chemical Methodology and Library Development, Boston University 590 Commonwealth Avenue, Boston, MA 02215 (USA)
| |
Collapse
|
34
|
Roche SP, Porco JA. Desaromatisierungsstrategien in der Synthese strukturell komplexer Naturstoffe. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201006017] [Citation(s) in RCA: 314] [Impact Index Per Article: 24.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
|
35
|
Kim SM, Jin MY, Kim MJ, Cui Y, Kim YS, Zhang L, Song CE, Ryu DH, Yang JW. N-heterocyclic carbene-catalysed intermolecular Stetter reactions of acetaldehyde. Org Biomol Chem 2011; 9:2069-71. [PMID: 21340069 DOI: 10.1039/c0ob01178a] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A facile method for the intermolecular Stetter reaction of various Michael acceptors with acetaldehyde as a biomimetic acylanion source was realized using N-heterocyclic carbene catalysis. This catalytic system has also been applied to the enantioselective Stetter reaction and resulted in moderate to good enantioselectivities for the corresponding Stetter products.
Collapse
Affiliation(s)
- Sun Min Kim
- Department of Energy Science, Sungkyunkwan University, Suwon 440-746, Korea
| | | | | | | | | | | | | | | | | |
Collapse
|
36
|
Vora HU, Rovis T. Asymmetric N-Heterocyclic Carbene (NHC) Catalyzed Acyl Anion Reactivity. ALDRICHIMICA ACTA 2011; 44:3-11. [PMID: 25346540 PMCID: PMC4205590] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Grants] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Affiliation(s)
- Harit U. Vora
- Department of Chemistry, Colorado State University, Fort Collins CO, 80523
| | - Tomislav Rovis
- Department of Chemistry, Colorado State University, Fort Collins CO, 80523
| |
Collapse
|
37
|
Campbell CD, Ling KB, Smith AD. N-Heterocyclic Carbenes in Organocatalysis. CATALYSIS BY METAL COMPLEXES 2010. [DOI: 10.1007/978-90-481-2866-2_12] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/02/2022]
|
38
|
Vora HU, Moncecchi JR, Epstein O, Rovis T. Nucleophilic carbene catalyzed synthesis of 1,2 amino alcohols via azidation of epoxy aldehydes. J Org Chem 2009; 73:9727-31. [PMID: 18989930 DOI: 10.1021/jo8020055] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We report herein a nucleophilic carbene catalyzed redox azidation of epoxyaldehydes. The intermediate beta-hydroxy acyl azides undergo thermal Curtius rearrangement followed by trapping with excess azide to form carbamoyl azides or, in a complementary sequence, by the hydroxy group to form oxazolidinones. Both products are formed in modest to good yields and diastereoselectivities. The use of an enantioenriched triazolium catalyst leads to modest asymmetric induction.
Collapse
Affiliation(s)
- Harit U Vora
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, USA
| | | | | | | |
Collapse
|
39
|
Liu Q, Rovis T. Enantio- and diastereoselective intermolecular Stetter reaction of glyoxamide and alkylidene ketoamides. Org Lett 2009; 11:2856-9. [PMID: 19507841 DOI: 10.1021/ol901081a] [Citation(s) in RCA: 100] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A triazolinylidene carbene catalyzed intermolecular Stetter reaction of glyoxamide and alkylidene ketoamides has been developed. 1,4-Dicarbonyl products are afforded in good to excellent yields, enantioselectivities, and diastereoselectivities. Further derivatization of the products affords useful intermediates for organic synthesis.
Collapse
Affiliation(s)
- Qin Liu
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, USA
| | | |
Collapse
|
40
|
Giroux MA, Guérard KC, Beaulieu MA, Sabot C, Canesi S. Alternative Coupling Reaction with Unactivated Furan Derivatives. European J Org Chem 2009. [DOI: 10.1002/ejoc.200900542] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
|
41
|
Abstract
This account chronicles our efforts at the development of a catalytic asymmetric Stetter reaction using chiral triazolium salts as small molecule organic catalysts. Advances in the mechanistically related azolium-catalyzed asymmetric benzoin reaction are discussed, particularly as they apply to catalyst design. A chronological treatise of reaction discovery, catalyst optimization and reactivity extension follows.
Collapse
Affiliation(s)
| | - Tomislav Rovis
- Department of Chemistry, Colorado State University, Fort Collins, Colorado
| |
Collapse
|
42
|
Affiliation(s)
- Viktor V Zhdankin
- Department of Chemistry and Biochemistry, University of Minnesota Duluth, Duluth, Minnesota 55812, USA.
| | | |
Collapse
|
43
|
Liu Q, Perreault S, Rovis T. Catalytic asymmetric intermolecular Stetter reaction of glyoxamides with alkylidenemalonates. J Am Chem Soc 2008; 130:14066-7. [PMID: 18834123 DOI: 10.1021/ja805680z] [Citation(s) in RCA: 208] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
An asymmetric intermolecular Stetter reaction of glyoxamide and alkylidenemalonates has been developed. Catalyzed by a novel N-heterocyclic carbene, the Stetter adducts are formed in good yield and excellent enantioselectivity. The presence of a sensitive epimerizable stereocenter is tolerated under these mildly basic reaction conditions if a bulky amine base is used. The products may be further elaborated to provide synthetically useful intermediates.
Collapse
Affiliation(s)
- Qin Liu
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, USA
| | | | | |
Collapse
|
44
|
Orellana A, Rovis T. Towards the total synthesis of FD-838: modular enantioselective assembly of the core. Chem Commun (Camb) 2008:730-2. [PMID: 18478705 DOI: 10.1039/b716445a] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A rapid assembly of the tetracyclic core of FD-838, featuring a catalytic asymmetric Stetter reaction, is described.
Collapse
Affiliation(s)
- Arturo Orellana
- Department of Chemistry, York University, 4700 Keele Street, Toronto, ON, Canada.
| | | |
Collapse
|
45
|
de Alaniz JR, Kerr MS, Moore JL, Rovis T. Scope of the asymmetric intramolecular stetter reaction catalyzed by chiral nucleophilic triazolinylidene carbenes. J Org Chem 2008; 73:2033-40. [PMID: 18302407 DOI: 10.1021/jo702313f] [Citation(s) in RCA: 114] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A highly enantioselective intramolecular Stetter reaction of aromatic and aliphatic aldehydes tethered to different Michael acceptors has been developed. Two triazolium scaffolds have been identified that catalyze the intramolecular Stetter reaction with good reactivity and enantioselectivity. The substrate scope has been examined and found to be broad; both electron-rich and -poor aromatic aldehydes undergo cyclization in high yield and enantioselectivity. The tether can include oxygen, sulfur, nitrogen, and carbon linkers with no detrimental effects. In addition, the incorporation of various tethered Michael acceptors includes amides, esters, thioesters, ketones, aldehydes, and nitriles. The catalyst loading may be reduced to 3 mol % without significantly affecting the reactivity or selectivity of the reaction.
Collapse
Affiliation(s)
- Javier Read de Alaniz
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, USA
| | | | | | | |
Collapse
|
46
|
Rovis T. Development of Chiral Bicyclic Triazolium Salt Organic Catalysts: The Importance of theN-Aryl Substituent. CHEM LETT 2008. [DOI: 10.1246/cl.2008.2] [Citation(s) in RCA: 164] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
|
47
|
Yoshida M, Yamaguchi K. Total Synthesis of Dispyrin, Purpurealidin E, and Aplysamine-1. Chem Pharm Bull (Tokyo) 2008; 56:1362-3. [DOI: 10.1248/cpb.56.1362] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- Makoto Yoshida
- Faculty of Pharmaceutical Sciences at Kagawa Campus, Tokushima Bunri University
| | - Kentaro Yamaguchi
- Faculty of Pharmaceutical Sciences at Kagawa Campus, Tokushima Bunri University
| |
Collapse
|
48
|
Wasnaire P, de Merode T, Markó IE. Intramolecular Stetter cyclisation of Morita–Baylis–Hillman adducts: a versatile approach towards bicycloenediones. Chem Commun (Camb) 2007:4755-7. [DOI: 10.1039/b710492h] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|