1
|
Ma T, He Y, Qiao XX, Zou CP, Wu XX, Li G, Zhao XJ. Chiral phosphoric acid-catalyzed enantioselective aza-Friedel-Crafts reaction of naphthols and electron-rich phenols with 2-aryl-3 H-indol-3-ones. Org Biomol Chem 2023; 21:489-493. [PMID: 36541043 DOI: 10.1039/d2ob02179j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The enantioselective aza-Friedel-Crafts reaction is one of the most straightforward and efficient strategies for constructing a new carbon-carbon bond bearing quaternary stereocenter in organic synthesis, but the catalytic asymmetric aza-Friedel-Crafts reaction of naphthols/phenols with cyclic-ketimines attached to a neutral functional group remains still relatively unexplored. Herein, a highly enantioselective aza-Friedel-Crafts reaction of cyclic-ketimines and naphthols/phenols has been realized using a chiral phosphoric acid catalyst. A variety of chiral aminonaphthols (chiral indolin-3-ones) containing a quaternary stereocenter at the C2 position were obtained with excellent outcomes (up to 97% yield, 98% ee). Moreover, the synthetic utility of the enantiomerically enriched chiral aminonaphthols was demonstrated in some efficient transformations. According to the experimental results, a possible transition state model has been proposed to rationalize the origin of asymmetric induction.
Collapse
Affiliation(s)
- Tao Ma
- Key Laboratory of Chemistry in Ethnic Medicinal Resources, Key Laboratory of Natural Products Synthetic Biology of Ethnic Medicinal Endophytes, State Ethnic Affairs Commission & Ministry of Education, School of Ethnic Medicine, Yunnan Minzu University, Kunming, 650500, China.
| | - Yonghui He
- Key Laboratory of Chemistry in Ethnic Medicinal Resources, Key Laboratory of Natural Products Synthetic Biology of Ethnic Medicinal Endophytes, State Ethnic Affairs Commission & Ministry of Education, School of Ethnic Medicine, Yunnan Minzu University, Kunming, 650500, China.
| | - Xiu-Xiu Qiao
- Key Laboratory of Chemistry in Ethnic Medicinal Resources, Key Laboratory of Natural Products Synthetic Biology of Ethnic Medicinal Endophytes, State Ethnic Affairs Commission & Ministry of Education, School of Ethnic Medicine, Yunnan Minzu University, Kunming, 650500, China.
| | - Chang-Peng Zou
- Key Laboratory of Chemistry in Ethnic Medicinal Resources, Key Laboratory of Natural Products Synthetic Biology of Ethnic Medicinal Endophytes, State Ethnic Affairs Commission & Ministry of Education, School of Ethnic Medicine, Yunnan Minzu University, Kunming, 650500, China.
| | - Xi-Xi Wu
- Key Laboratory of Chemistry in Ethnic Medicinal Resources, Key Laboratory of Natural Products Synthetic Biology of Ethnic Medicinal Endophytes, State Ethnic Affairs Commission & Ministry of Education, School of Ethnic Medicine, Yunnan Minzu University, Kunming, 650500, China.
| | - Ganpeng Li
- Key Laboratory of Chemistry in Ethnic Medicinal Resources, Key Laboratory of Natural Products Synthetic Biology of Ethnic Medicinal Endophytes, State Ethnic Affairs Commission & Ministry of Education, School of Ethnic Medicine, Yunnan Minzu University, Kunming, 650500, China.
| | - Xiao-Jing Zhao
- Key Laboratory of Chemistry in Ethnic Medicinal Resources, Key Laboratory of Natural Products Synthetic Biology of Ethnic Medicinal Endophytes, State Ethnic Affairs Commission & Ministry of Education, School of Ethnic Medicine, Yunnan Minzu University, Kunming, 650500, China.
| |
Collapse
|
2
|
Ushakov PY, Ioffe SL, Sukhorukov AY. Regio- and diastereoselective access to densely functionalized ketones via the Boekelheide rearrangement of isoxazoline N-oxides. Org Biomol Chem 2022; 20:5624-5637. [PMID: 35796681 DOI: 10.1039/d2ob00787h] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
In this work, the classical "isoxazoline route" toward aldols involving the [3 + 2]-cycloaddition of nitrile oxide to alkenes and hydrogenolysis of the oxime group was revisited. To avoid regioselectivity issues, [4 + 1]-annulation of nitroalkenes with sulfonium ylides was used to construct the isoxazoline ring bearing an N-oxide moiety. Subsequent deoxygenative C-H functionalization using the Boekelheide rearrangement and hydrogenolysis of the isoxazoline ring afforded α'-acyloxy-substituted aldols, which are difficult to access both by the classical aldol reaction and the "isoxazoline route". The products are formed in good to high overall yields and as single diastereomers in most cases. The synthetic use of these aldols was showcased by their smooth transformation into diastereomerically pure triols and a 2,3-diaryl-4-hydroxy-substituted tetrahydrofuran derivative, which is structurally related to cinncassin B.
Collapse
Affiliation(s)
- Pavel Yu Ushakov
- N. D. Zelinsky Institute of Organic Chemistry, 119991, Leninsky prospect, 47, Moscow, Russian Federation.
| | - Sema L Ioffe
- N. D. Zelinsky Institute of Organic Chemistry, 119991, Leninsky prospect, 47, Moscow, Russian Federation.
| | - Alexey Yu Sukhorukov
- N. D. Zelinsky Institute of Organic Chemistry, 119991, Leninsky prospect, 47, Moscow, Russian Federation.
| |
Collapse
|
3
|
Ushakov PY, Sukhorukov AY, Ioffe SL, Tabolin AA. Sequential Formal [4+1]‐Cycloaddition, C−H Functionalization and Suzuki–Miyaura Cross‐Coupling for the Synthesis of Trisubstituted Isoxazolines. European J Org Chem 2021. [DOI: 10.1002/ejoc.202100313] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Pavel Yu. Ushakov
- Laboratory of organic and metal-organic nitrogen-oxygen systems N. D. Zelinsky Institute of Organic Chemistry Russian Academy of Sciences Leninsky prospect, 47 119991 Moscow Russia
- Department of Chemistry M. V. Lomonosov Moscow State University Leninskie gory, 1, str. 3 119991 Moscow Russia
| | - Alexey Yu. Sukhorukov
- Laboratory of organic and metal-organic nitrogen-oxygen systems N. D. Zelinsky Institute of Organic Chemistry Russian Academy of Sciences Leninsky prospect, 47 119991 Moscow Russia
- Plekhanov Russian University of Economics Stremyanny per. 36 117997 Moscow Russia
| | - Sema L. Ioffe
- Laboratory of organic and metal-organic nitrogen-oxygen systems N. D. Zelinsky Institute of Organic Chemistry Russian Academy of Sciences Leninsky prospect, 47 119991 Moscow Russia
| | - Andrey A. Tabolin
- Laboratory of organic and metal-organic nitrogen-oxygen systems N. D. Zelinsky Institute of Organic Chemistry Russian Academy of Sciences Leninsky prospect, 47 119991 Moscow Russia
| |
Collapse
|
4
|
Gu H, Hu Y, Jia Y, Zhou Q, Luo G, Chen X. Total Synthesis of (-)-Lepadin F based on a Stereoselective Diels-Alder Reaction Controlled by a Ketolactone-type Dienophile. Chemistry 2021; 27:4141-4149. [PMID: 33289139 DOI: 10.1002/chem.202004778] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2020] [Indexed: 01/24/2023]
Abstract
An efficient approach to the type III lepadin alkaloids (lepadins F and G) has been developed through a key Diels-Alder reaction, in which a novel ketolactone-type dienophile with chiral diol unit is employed to generate the desirable all-cis-trisubstituted cyclohexene with excellent regio- and stereoselectivity control. The subsequent selective sulfonylation of the diol unit followed by SN 2 cyclization under hydrogenation conditions could construct the substituted piperidine ring. By using this approach, (-)-lepadin F is synthesized from ethyl l-lactate for the first time.
Collapse
Affiliation(s)
- He Gu
- Key Laboratory of Green Chemistry & Technology of Ministry of Education, College of Chemistry, Sichuan University, 610064, Chengdu, People's Republic of China
| | - Yue Hu
- Key Laboratory of Green Chemistry & Technology of Ministry of Education, College of Chemistry, Sichuan University, 610064, Chengdu, People's Republic of China
| | - Yuanliang Jia
- Key Laboratory of Green Chemistry & Technology of Ministry of Education, College of Chemistry, Sichuan University, 610064, Chengdu, People's Republic of China
| | - Qin Zhou
- Key Laboratory of Green Chemistry & Technology of Ministry of Education, College of Chemistry, Sichuan University, 610064, Chengdu, People's Republic of China
| | - Guiyin Luo
- Key Laboratory of Green Chemistry & Technology of Ministry of Education, College of Chemistry, Sichuan University, 610064, Chengdu, People's Republic of China
| | - Xiaochuan Chen
- Key Laboratory of Green Chemistry & Technology of Ministry of Education, College of Chemistry, Sichuan University, 610064, Chengdu, People's Republic of China
| |
Collapse
|
5
|
Tsutsumi T, Namba K. Total Synthesis of Epilupinine: Synthetic Strategy of Fused Bicyclic Skeleton Containing Nitrogen. CHEM LETT 2020. [DOI: 10.1246/cl.200340] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Tomohiro Tsutsumi
- Graduate School of Pharmaceutical Sciences and Research Cluster on “Innovative Chemical Sensing”, Tokushima University, 1-78-1 Shomachi, Tokushima 770-8505, Japan
| | - Kosuke Namba
- Graduate School of Pharmaceutical Sciences and Research Cluster on “Innovative Chemical Sensing”, Tokushima University, 1-78-1 Shomachi, Tokushima 770-8505, Japan
| |
Collapse
|
6
|
Tsutsumi T, Karanjit S, Nakayama A, Namba K. A Concise Asymmetric Total Synthesis of (+)-Epilupinine. Org Lett 2019; 21:2620-2624. [PMID: 30963767 DOI: 10.1021/acs.orglett.9b00607] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Asymmetric total synthesis of (+)-epilupinine was achieved in just three steps using only commercially available common reagents. The total synthesis involved alkylations of N-nosylamide, ozone oxidation, and sequential reactions of the removal of the nosyl group, intramolecular dehydrative condensation, intramolecular Mannich reaction catalyzed by l-proline, and a reduction.
Collapse
Affiliation(s)
- Tomohiro Tsutsumi
- Graduate School of Pharmaceutical Science and Research Cluster on "Innovative Chemical Sensing" , Tokushima University , 1-78-1 Shomachi , Tokushima 770-8505 , Japan
| | - Sangita Karanjit
- Graduate School of Pharmaceutical Science and Research Cluster on "Innovative Chemical Sensing" , Tokushima University , 1-78-1 Shomachi , Tokushima 770-8505 , Japan
| | - Atsushi Nakayama
- Graduate School of Pharmaceutical Science and Research Cluster on "Innovative Chemical Sensing" , Tokushima University , 1-78-1 Shomachi , Tokushima 770-8505 , Japan
| | - Kosuke Namba
- Graduate School of Pharmaceutical Science and Research Cluster on "Innovative Chemical Sensing" , Tokushima University , 1-78-1 Shomachi , Tokushima 770-8505 , Japan
| |
Collapse
|
7
|
Prasad SS, Baskaran S. Iminosugar C-Nitromethyl Glycoside: Stereoselective Synthesis of Isoxazoline and Isoxazole-Fused Bicyclic Iminosugars. J Org Chem 2018; 83:1558-1564. [PMID: 29313687 DOI: 10.1021/acs.joc.7b02803] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A simple and efficient method for the stereoselective synthesis of isoxazoline/isoxazole-fused iminosugar derivatives has been developed using intramolecular nitrile oxide cycloaddition (INOC) as a key step. Iminosugar C-nitromethyl glycosides, derived from simple carbohydrates, served as excellent nitrile oxide precursors in 1,3-dipolar cycloaddition reactions. N-Alkenyl iminosugar C-nitromethyl glycosides afforded novel isoxazoline-fused indolizidine-, pyrrolizidine-, and quinolizidine-based iminosugars in excellent yields with a high degree of stereoselectivity, whereas N-alkynyl iminosugar C-nitromethyl glycosides furnished the corresponding isoxazole containing tricyclic iminosugars in very good yields.
Collapse
Affiliation(s)
- Sure Siva Prasad
- Department of Chemistry, Indian Institute of Technology Madras , Chennai 600036, India
| | - Sundarababu Baskaran
- Department of Chemistry, Indian Institute of Technology Madras , Chennai 600036, India
| |
Collapse
|
8
|
Li X, Hu L, Jia J, Gu H, Jia Y, Chen X. A Stereoselective Approach toward (−)-Lepadins A–C. Org Lett 2017; 19:5372-5375. [DOI: 10.1021/acs.orglett.7b02647] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Xiong Li
- Key Laboratory of Green Chemistry & Technology of Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, People’s Republic of China
| | - Lingling Hu
- Key Laboratory of Green Chemistry & Technology of Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, People’s Republic of China
| | - Junhao Jia
- Key Laboratory of Green Chemistry & Technology of Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, People’s Republic of China
| | - He Gu
- Key Laboratory of Green Chemistry & Technology of Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, People’s Republic of China
| | - Yuanliang Jia
- Key Laboratory of Green Chemistry & Technology of Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, People’s Republic of China
| | - Xiaochuan Chen
- Key Laboratory of Green Chemistry & Technology of Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, People’s Republic of China
| |
Collapse
|
9
|
Balalaie S, Shamakli M, Nikbakht A, Alavijeh NS, Rominger F, Rostamizadeh S, Bijanzadeh HR. Direct access to isoxazolino and isoxazolo benzazepines from 2-((hydroxyimino)methyl)benzoic acid via a post-Ugi heteroannulation. Org Biomol Chem 2017; 15:5737-5742. [PMID: 28654111 DOI: 10.1039/c7ob01142c] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
A diversity-oriented access to isoxazolino and isoxazolo benzazepines is elaborated via a post-Ugi heteroannulation involving intramolecular 1,3-dipolar cycloaddition reaction of nitrile oxides with alkenes and alkynes. This sequence offers an interesting multicomponent entry to a library of isoxazolino and isoxazolo benzazepines under mild reaction conditions in good to excellent yields.
Collapse
Affiliation(s)
- Saeed Balalaie
- Peptide Chemistry Research Center, K. N. Toosi University of Technology, P. O. Box 15875-4416, Tehran, Iran. and Medical Biology Research Center, Kermanshah University of Medical Sciences, Kermanshah, Iran
| | - Mohammad Shamakli
- Peptide Chemistry Research Center, K. N. Toosi University of Technology, P. O. Box 15875-4416, Tehran, Iran.
| | - Ali Nikbakht
- Peptide Chemistry Research Center, K. N. Toosi University of Technology, P. O. Box 15875-4416, Tehran, Iran.
| | - Nahid S Alavijeh
- Peptide Chemistry Research Center, K. N. Toosi University of Technology, P. O. Box 15875-4416, Tehran, Iran.
| | - Frank Rominger
- Organisch-Chemisches Institut der Universität Heidelberg, Im Neuenheimer Feld 270, D-69120 Heidelberg, Germany
| | - Shahnaz Rostamizadeh
- Peptide Chemistry Research Center, K. N. Toosi University of Technology, P. O. Box 15875-4416, Tehran, Iran.
| | | |
Collapse
|
10
|
Li Y, Li J, Ding H, Li A. Recent advances on the total synthesis of alkaloids in mainland China. Natl Sci Rev 2017. [DOI: 10.1093/nsr/nwx050] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Abstract
AbstractAlkaloids are a large family of natural products that mostly contain basic nitrogen atoms. Because of their intriguing structures and important functions, they have long been popular targets for synthetic organic chemists. China's chemists have made significant progress in the area of alkaloid synthesis over past decades. In this article, selected total syntheses of alkaloids from research groups in mainland China during the period 2011–16 are highlighted.
Collapse
Affiliation(s)
- Yong Li
- State Key Laboratory of Bioorganic and Natural Products Chemistry, Collaborative Innovation Center of Chemistry for Life Sciences, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, China
- Zhejiang Key Laboratory of Alternative Technologies for Fine Chemicals Process, Shaoxing University, Shaoxing 312000, China
| | - Jian Li
- State Key Laboratory of Bioorganic and Natural Products Chemistry, Collaborative Innovation Center of Chemistry for Life Sciences, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, China
| | - Hanfeng Ding
- Department of Chemistry, Zhejiang University, Hangzhou 310028, China
| | - Ang Li
- State Key Laboratory of Bioorganic and Natural Products Chemistry, Collaborative Innovation Center of Chemistry for Life Sciences, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, China
| |
Collapse
|
11
|
Brambilla M, Davies SG, Fletcher AM, Roberts PM, Thomson JE, Zimmer D. Pyrrolizidines, indolizidines and quinolizidines via a double reductive cyclisation protocol: concise asymmetric syntheses of (+)-trachelanthamidine, (+)-tashiromine and (+)-epilupinine. Tetrahedron 2016. [DOI: 10.1016/j.tet.2016.09.006] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
|
12
|
Abstract
This review of simple indolizidine and quinolizidine alkaloids (i.e., those in which the parent bicyclic systems are in general not embedded in polycyclic arrays) is an update of the previous coverage in Volume 55 of this series (2001). The present survey covers the literature from mid-1999 to the end of 2013; and in addition to aspects of the isolation, characterization, and biological activity of the alkaloids, much emphasis is placed on their total synthesis. A brief introduction to the topic is followed by an overview of relevant alkaloids from fungal and microbial sources, among them slaframine, cyclizidine, Steptomyces metabolites, and the pantocins. The important iminosugar alkaloids lentiginosine, steviamine, swainsonine, castanospermine, and related hydroxyindolizidines are dealt with in the subsequent section. The fourth and fifth sections cover metabolites from terrestrial plants. Pertinent plant alkaloids bearing alkyl, functionalized alkyl or alkenyl substituents include dendroprimine, anibamine, simple alkaloids belonging to the genera Prosopis, Elaeocarpus, Lycopodium, and Poranthera, and bicyclic alkaloids of the lupin family. Plant alkaloids bearing aryl or heteroaryl substituents include ipalbidine and analogs, secophenanthroindolizidine and secophenanthroquinolizidine alkaloids (among them septicine, julandine, and analogs), ficuseptine, lasubines, and other simple quinolizidines of the Lythraceae, the simple furyl-substituted Nuphar alkaloids, and a mixed quinolizidine-quinazoline alkaloid. The penultimate section of the review deals with the sizable group of simple indolizidine and quinolizidine alkaloids isolated from, or detected in, ants, mites, and terrestrial amphibians, and includes an overview of the "dietary hypothesis" for the origin of the amphibian metabolites. The final section surveys relevant alkaloids from marine sources, and includes clathryimines and analogs, stellettamides, the clavepictines and pictamine, and bis(quinolizidine) alkaloids.
Collapse
|
13
|
Wang CY, Dong C, Zheng ZJ, Xu Z, Yang KF, Xu LW. Construction of an all-substituted pyrrolidine derivative with multiple stereogenic centers and Betti-base-derived γ-amino alcohols by [1,2]-Wittig rearrangement. RSC Adv 2015. [DOI: 10.1039/c5ra09145d] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The construction of Betti base-derived γ-amino alcohols and all-substituted pyrrolidine derivative with multiple stereogenic centers has been developed successfully through neighboring lithium-assisted [1,2]-Wittig rearrangement (NLAWR).
Collapse
Affiliation(s)
- Cai-Yun Wang
- Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education (MOE)
- Hangzhou Normal University
- Hangzhou 311121
- P. R. China
| | - Cheng Dong
- Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education (MOE)
- Hangzhou Normal University
- Hangzhou 311121
- P. R. China
| | - Zhan-Jiang Zheng
- Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education (MOE)
- Hangzhou Normal University
- Hangzhou 311121
- P. R. China
| | - Zheng Xu
- Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education (MOE)
- Hangzhou Normal University
- Hangzhou 311121
- P. R. China
| | - Ke-Fang Yang
- Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education (MOE)
- Hangzhou Normal University
- Hangzhou 311121
- P. R. China
| | - Li-Wen Xu
- Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education (MOE)
- Hangzhou Normal University
- Hangzhou 311121
- P. R. China
- State Key Laboratory for Oxo Synthesis and Selective Oxidation
| |
Collapse
|
14
|
Thorat RG, Pansare SV. A General Approach to 1-Hydroxymethylquinolizidine and 8-Hydroxymethylindolizidine Stereoisomers: Synthesis of (+)-Epitashiromine and Formal Syntheses of (+)-Epilupinine and (+)-Tashiromine. European J Org Chem 2013. [DOI: 10.1002/ejoc.201301078] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
|
15
|
Electroreductive intramolecular coupling of aliphatic cyclic imides with α,β-unsaturated esters and ketones: unusual methyl-alkoxy exchange in silyl ketene acetals. Tetrahedron Lett 2013. [DOI: 10.1016/j.tetlet.2013.04.047] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
16
|
Chittimalla SK, Kuppusamy R, Thiyagarajan K, Bandi C. Reaction of Nitrile Oxides with Maskedo-Benzoquinones; Synthesis of Highly Functionalized Isoxazolines. European J Org Chem 2013. [DOI: 10.1002/ejoc.201201670] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
|
17
|
Cheng G, Wang X, Bao H, Cheng C, Liu N, Hu Y. Total syntheses of (-)-hanishin, (-)-longamide B, and (-)-longamide B methyl ester via a novel preparation of N-substituted pyrrole-2-carboxylates [corrected]. Org Lett 2012; 14:1062-5. [PMID: 22315925 DOI: 10.1021/ol203433c] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A novel preparation of N-substituted pyrrole-2-carboxylates has been developed based upon 1,3-dipolar cycloaddition and a conventional hydrogenolysis. By using this method as the key step, total syntheses of natural alkaloids (-)-hanishin, (-)-longamide [corrected] B, and (-)-longamide [corrected] B methyl ester were accomplished in the highest overall yields, respectively.
Collapse
Affiliation(s)
- Guolin Cheng
- Department of Chemistry, Tsinghua University, Beijing 100084, P. R. China
| | | | | | | | | | | |
Collapse
|
18
|
Cutter AC, Miller IR, Keily JF, Bellingham RK, Light ME, Brown RCD. Total Syntheses of (−) Epilupinine and (−)-Tashiromine Using Imino-Aldol Reactions. Org Lett 2011; 13:3988-91. [DOI: 10.1021/ol2015048] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Amanda C. Cutter
- The School of Chemistry, The University of Southampton, Highfield, Southampton SO17 1BJ, U.K., Prosidion Ltd., Transport Way, Cowley, Oxford OX4 6LT, U.K., and Chemical Development, GlaxoSmithKline Pharmaceuticals, The Old Powder Mills, Leigh, Tonbridge, Kent TN11 9AN, U.K
| | - Iain R. Miller
- The School of Chemistry, The University of Southampton, Highfield, Southampton SO17 1BJ, U.K., Prosidion Ltd., Transport Way, Cowley, Oxford OX4 6LT, U.K., and Chemical Development, GlaxoSmithKline Pharmaceuticals, The Old Powder Mills, Leigh, Tonbridge, Kent TN11 9AN, U.K
| | - John F. Keily
- The School of Chemistry, The University of Southampton, Highfield, Southampton SO17 1BJ, U.K., Prosidion Ltd., Transport Way, Cowley, Oxford OX4 6LT, U.K., and Chemical Development, GlaxoSmithKline Pharmaceuticals, The Old Powder Mills, Leigh, Tonbridge, Kent TN11 9AN, U.K
| | - Richard K. Bellingham
- The School of Chemistry, The University of Southampton, Highfield, Southampton SO17 1BJ, U.K., Prosidion Ltd., Transport Way, Cowley, Oxford OX4 6LT, U.K., and Chemical Development, GlaxoSmithKline Pharmaceuticals, The Old Powder Mills, Leigh, Tonbridge, Kent TN11 9AN, U.K
| | - Mark E. Light
- The School of Chemistry, The University of Southampton, Highfield, Southampton SO17 1BJ, U.K., Prosidion Ltd., Transport Way, Cowley, Oxford OX4 6LT, U.K., and Chemical Development, GlaxoSmithKline Pharmaceuticals, The Old Powder Mills, Leigh, Tonbridge, Kent TN11 9AN, U.K
| | - Richard C. D. Brown
- The School of Chemistry, The University of Southampton, Highfield, Southampton SO17 1BJ, U.K., Prosidion Ltd., Transport Way, Cowley, Oxford OX4 6LT, U.K., and Chemical Development, GlaxoSmithKline Pharmaceuticals, The Old Powder Mills, Leigh, Tonbridge, Kent TN11 9AN, U.K
| |
Collapse
|
19
|
Cheng G, Wang X, Zhu R, Shao C, Xu J, Hu Y. Total synthesis of (-)-cocaine and (-)-ferruginine. J Org Chem 2011; 76:2694-700. [PMID: 21391709 DOI: 10.1021/jo200069m] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Total synthesis of tropane alkaloids (-)-cocaine and (-)-ferruginine were accomplished in nine steps each and in 55% and 46% overall yields, respectively, starting from the known Betti base derivative (+)-(7aR,10R,12S)-10-(1H-benzotriazol-1-yl)-7a,8,9,10-tetrahydro-12-phenyl-12H-naphtho[1,2-e]pyrrolo[2,1-b][1,3]oxazine. In this novel route, RCM reaction and 1,3-dipolar cycloaddition were employed as key steps for the enantioselective construction of tropane skeleton and the regioselective introduction of 3-bromo-2-isoxazoline ring as masked cis-2,3-disubstituents. To obtain the desired precursor (2S,5R)-2-allyl-5-vinylpyrrolidine for RCM reaction, we developed a general and practical method for the preparation of enantiopure cis-2,5-disubstituted pyrrolidines bearing alkene- and/or alkyne-containing substituents. We also offered two highly efficient pathways for the conversion of the 3-bromo-2-isoxazoline ring into the desired cis-2,3-disubstituted groups in (-)-cocaine and (-)-ferruginine.
Collapse
Affiliation(s)
- Guolin Cheng
- Department of Chemistry, Tsinghua University, Beijing 100084, People's Republic of China
| | | | | | | | | | | |
Collapse
|