201
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Blair DJ, Fletcher CJ, Wheelhouse KMP, Aggarwal VK. Stereocontrolled Synthesis of Adjacent Acyclic Quaternary-Tertiary Motifs: Application to a Concise Total Synthesis of (−)-Filiformin. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201400944] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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202
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Williams DR, Mondal PK, Bawel SA, Nag PP. Stereocontrolled Synthesis of the Tricyclic ABC Ring System of Daphnicyclidin A. Org Lett 2014; 16:1956-9. [DOI: 10.1021/ol5005092] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- David R. Williams
- Department of Chemistry, Indiana University, Bloomington, Indiana 47405, United States
| | - Prolay K. Mondal
- Department of Chemistry, Indiana University, Bloomington, Indiana 47405, United States
| | - Seth A. Bawel
- Department of Chemistry, Indiana University, Bloomington, Indiana 47405, United States
| | - Partha P. Nag
- Department of Chemistry, Indiana University, Bloomington, Indiana 47405, United States
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203
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Fang LC, Hsung RP. Stereoselective synthesis of isoquinuclidines through an aza-[4 + 2] cycloaddition of chiral cyclic 2-amidodienes. Org Lett 2014; 16:1826-9. [PMID: 24621094 PMCID: PMC3969095 DOI: 10.1021/ol500390a] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2014] [Indexed: 11/29/2022]
Abstract
A highly stereoselective aza-[4 + 2] cycloaddition of chiral cyclic 2-amidodienes with N-sulfonyl aldimines is described. While this Lewis acid promoted heterocycloaddition provides an efficient strategy for constructing optically enriched isoquinuclidines, it is mechanistically intriguing. The cycloaddition favored the endo-II pathway in the absence of a viable bidentate coordination. This represents an unexpected switch from the anticipated endo-I selectivity obtained in the all-carbon cycloaddition.
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Affiliation(s)
- Li-Chao Fang
- Division
of Pharmaceutical
Sciences, School of Pharmacy, University
of Wisconsin, Madison, Wisconsin 53705, United States
| | - Richard P. Hsung
- Division
of Pharmaceutical
Sciences, School of Pharmacy, University
of Wisconsin, Madison, Wisconsin 53705, United States
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204
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Kang B, Jakubec P, Dixon DJ. Strategies towards the synthesis of calyciphylline A-type Daphniphyllum alkaloids. Nat Prod Rep 2014; 31:550-62. [PMID: 24595901 DOI: 10.1039/c3np70115h] [Citation(s) in RCA: 94] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The Daphniphyllum alkaloids are a diverse family of natural products rich in number and structural diversity that have been known for many decades. However, the structurally unique subclass of calyciphylline A-type alkaloids has only recently been discovered and is relatively unexplored. Several noteworthy core syntheses and the development of a wide range of novel synthetic strategies have been achieved. This includes strategies based on intramolecular Michael addition, Pd-catalysis, cycloaddition, and Mannich-type reactions. This review will provide an overview of these synthetic studies.
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Affiliation(s)
- Baldip Kang
- The Department of Chemistry, Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford, OX1 3TA, UK.
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205
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Li H, Qiu Y, Zhao C, Yuan Z, Xie X, She X. Diels-Alder/Oxidative Aromatization Approach towards the All-Carbon DEF Tricyclic Skeleton of Daphenylline. Chem Asian J 2014; 9:1274-7. [DOI: 10.1002/asia.201400002] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2014] [Indexed: 11/05/2022]
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206
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Wang L, Xu C, Chen L, Hao X, Wang DZ. Asymmetric Synthesis of the Tricyclic Core of Calyciphylline A-Type Alkaloids via Intramolecular [3 + 2] Cycloaddition. Org Lett 2014; 16:1076-9. [DOI: 10.1021/ol403609c] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- Lu Wang
- Laboratory
of Chemical Genomics, School of Chemical Biology and Biotechnology, Shenzhen Graduate School of Peking University, Shenzhen 518055, China
| | - Chen Xu
- Laboratory
of Chemical Genomics, School of Chemical Biology and Biotechnology, Shenzhen Graduate School of Peking University, Shenzhen 518055, China
| | - Li Chen
- Laboratory
of Chemical Genomics, School of Chemical Biology and Biotechnology, Shenzhen Graduate School of Peking University, Shenzhen 518055, China
| | - Xiaojiang Hao
- Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650204, China
| | - David Zhigang Wang
- Laboratory
of Chemical Genomics, School of Chemical Biology and Biotechnology, Shenzhen Graduate School of Peking University, Shenzhen 518055, China
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207
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Ibrahim AA, Golonka AN, Lopez AM, Stockdill JL. Rapid access to the heterocyclic core of the calyciphylline A and daphnicyclidin A-type Daphniphyllum alkaloids via tandem cyclization of a neutral aminyl radical. Org Lett 2014; 16:1072-5. [PMID: 24506430 PMCID: PMC3954529 DOI: 10.1021/ol4034868] [Citation(s) in RCA: 54] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
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A streamlined approach to the tertiary
amine-containing core of
the calyciphylline A and daphnicyclidin A-type Daphniphyllum alkaloids is presented. A known carvone derivative is converted
into the core structure in only four synthetic operations, and it
is well poised for further elaboration. The key enabling methodology
is a radical cyclization cascade beginning with addition of a secondary,
neutral aminyl radical to the β-position of an enone, followed
by trapping with a pendant alkyne.
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Affiliation(s)
- Ahmad A Ibrahim
- Department of Chemistry, Wayne State University , 5101 Cass Avenue, Detroit, Michigan 48202, United States
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208
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Abstract
The total synthesis of the architecturally complex Daphniphyllum alkaloid (-)-calyciphylline N has been achieved. Highlights of the synthesis include a Et2AlCl-promoted, highly stereoselective, susbtrate-controlled intramolecular Diels-Alder reaction, a transannular enolate alkylation, an effective Stille carbonylation/Nazarov cyclization sequence, and a high-risk diastereoselective hydrogenation of a fully substituted conjugated diene ester.
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Affiliation(s)
- Artem Shvartsbart
- Department of Chemistry, Laboratory for Research on the Structure of Matter, and Monell Chemical Senses Center, University of Pennsylvania, Philadelphia, Pennsylvania, 19104, United States
| | - Amos B. Smith
- Department of Chemistry, Laboratory for Research on the Structure of Matter, and Monell Chemical Senses Center, University of Pennsylvania, Philadelphia, Pennsylvania, 19104, United States
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209
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Zhang Y, Luo T, Yang Z. Strategic innovation in the total synthesis of complex natural products using gold catalysis. Nat Prod Rep 2014; 31:489-503. [DOI: 10.1039/c3np70075e] [Citation(s) in RCA: 119] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
This review has been organized from the perspective of synthetic target families, with emphasis on the use of gold-catalyzed transformations and cascade reactions that significantly increase molecular complexity.
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Affiliation(s)
- Yun Zhang
- Laboratory of Chemical Genomics
- School of Chemical Biology and Biotechnology
- Peking University Shenzhen Graduate School
- Shenzhen 518055, China
| | - Tuoping Luo
- Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, and Beijing National Laboratory for Molecular Science (BNLMS)
- Peking-Tsinghua Center for Life Sciences
- Peking University
- Beijing 100871, China
| | - Zhen Yang
- Laboratory of Chemical Genomics
- School of Chemical Biology and Biotechnology
- Peking University Shenzhen Graduate School
- Shenzhen 518055, China
- Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, and Beijing National Laboratory for Molecular Science (BNLMS)
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210
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Cui HL, Tanaka F. One-pot synthesis of polysubstituted 3-acylpyrroles by cooperative catalysis. Org Biomol Chem 2014; 12:5822-6. [DOI: 10.1039/c4ob01019a] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Polysubstituted 3-acylpyrroles were synthesized from readily available unsaturated ketones and N-substituted propargylated amines via an aza-Michael/alkyne carbocyclization cascade followed by oxidation in one pot.
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Affiliation(s)
- Hai-Lei Cui
- Chemistry and Chemical Bioengineering Unit
- Okinawa Institute of Science and Technology Graduate University
- Onna, Japan
| | - Fujie Tanaka
- Chemistry and Chemical Bioengineering Unit
- Okinawa Institute of Science and Technology Graduate University
- Onna, Japan
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211
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Xiong X, Li Y, Lu Z, Wan M, Deng J, Wu S, Shao H, Li A. Synthesis of the 6,6,5,7-tetracyclic core of daphnilongeranin B. Chem Commun (Camb) 2014; 50:5294-7. [DOI: 10.1039/c3cc47873d] [Citation(s) in RCA: 64] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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212
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Yeoman JTS, Mak VW, Reisman SE. A Unified Strategy to ent-Kauranoid Natural Products: Total Syntheses of (−)-Trichorabdal A and (−)-Longikaurin E. J Am Chem Soc 2013; 135:11764-7. [DOI: 10.1021/ja406599a] [Citation(s) in RCA: 100] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- John T. S. Yeoman
- The Warren and Katharine Schlinger Laboratory for Chemistry
and Chemical Engineering, Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California
91125, United States
| | - Victor W. Mak
- The Warren and Katharine Schlinger Laboratory for Chemistry
and Chemical Engineering, Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California
91125, United States
| | - Sarah E. Reisman
- The Warren and Katharine Schlinger Laboratory for Chemistry
and Chemical Engineering, Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California
91125, United States
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