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Liang XT, Sun BC, Liu C, Li YH, Zhang N, Xu QQ, Zhang ZC, Han YX, Chen JH, Yang Z. Asymmetric Total Synthesis of (-)-Spirochensilide A, Part 1: Diastereoselective Synthesis of the ABCD Ring and Stereoselective Total Synthesis of 13( R)-Demethyl Spirochensilide A. J Org Chem 2021; 86:2135-2157. [PMID: 33433196 DOI: 10.1021/acs.joc.0c02494] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
A concise and diastereoselective construction of the ABCD ring system of spirochensilide A is described. The key steps of this synthesis are a semipinacol rearrangement reaction to stereoselectively construct the AB ring system bearing two vicinal quaternary chiral centers and a Co-mediated Pauson-Khand reaction to form the spiro-based bicyclic CD ring system. This chemistry leads to the stereoselective synthesis of 13(R)-demethyl spirochensilide A, paving the way for the first asymmetric total synthesis of (-)-spirochensilide A.
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Affiliation(s)
- Xin-Ting Liang
- State Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education and Beijing National Laboratory for Molecular Science (BNLMS), College of Chemistry, Peking University, Beijing 100871, China
| | - Bao-Chuan Sun
- State Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education and Beijing National Laboratory for Molecular Science (BNLMS), College of Chemistry, Peking University, Beijing 100871, China
| | - Chang Liu
- State Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education and Beijing National Laboratory for Molecular Science (BNLMS), College of Chemistry, Peking University, Beijing 100871, China
| | - Yuan-He Li
- State Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education and Beijing National Laboratory for Molecular Science (BNLMS), College of Chemistry, Peking University, Beijing 100871, China
| | - Nan Zhang
- State Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education and Beijing National Laboratory for Molecular Science (BNLMS), College of Chemistry, Peking University, Beijing 100871, China
| | - Qian-Qian Xu
- State Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education and Beijing National Laboratory for Molecular Science (BNLMS), College of Chemistry, Peking University, Beijing 100871, China
| | - Zhong-Chao Zhang
- Laboratory of Chemical Genomics, School of Chemical Biology and Biotechnology, Peking University Shenzhen Graduate School, Shenzhen 518055, China
| | - Yi-Xin Han
- State Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education and Beijing National Laboratory for Molecular Science (BNLMS), College of Chemistry, Peking University, Beijing 100871, China
| | - Jia-Hua Chen
- State Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education and Beijing National Laboratory for Molecular Science (BNLMS), College of Chemistry, Peking University, Beijing 100871, China
| | - Zhen Yang
- State Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education and Beijing National Laboratory for Molecular Science (BNLMS), College of Chemistry, Peking University, Beijing 100871, China.,Laboratory of Chemical Genomics, School of Chemical Biology and Biotechnology, Peking University Shenzhen Graduate School, Shenzhen 518055, China.,Shenzhen Bay Laboratory, Shenzhen 518055, China
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Paradas M, Campaña AG, Marcos ML, Justicia J, Haidour A, Robles R, Cárdenas DJ, Oltra JE, Cuerva JM. Unprecedented H-atom transfer from water to ketyl radicals mediated by Cp2TiCl. Dalton Trans 2010; 39:8796-800. [DOI: 10.1039/c001689f] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Ravn MM, Peters RJ, Coates RM, Croteau R. Mechanism of abietadiene synthase catalysis: stereochemistry and stabilization of the cryptic pimarenyl carbocation intermediates. J Am Chem Soc 2002; 124:6998-7006. [PMID: 12059223 DOI: 10.1021/ja017734b] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Abietadiene synthase (AS) catalyzes the complex cyclization-rearrangement of (E,E,E)-geranylgeranyl diphosphate (8, GGPP) to a mixture of abietadiene (1a), double bond isomers 2a-4a and pimaradienes 5a-7a as a key step in the biosynthesis of the abietane resin acid constituents (1b-4b) of conifer oleoresin. The reaction proceeds at two active sites by way of the intermediate, copalyl diphosphate (9). In the second site, a putative tricyclic pimaradiene or pimarenyl(+) carbocation intermediate of undefined C13 stereochemistry and annular double bond position is formed. Three 8-oxy-17-nor analogues of 9 (17 and 19a,b) and three isomeric 15,16-bisnorpimarenyl-N-methylamines (26a-c) were synthesized and evaluated as alternative substrates and/or inhibitors for recombinant AS from grand fir. The stereospecific cyclization of 8 alpha-hydroxy-17-nor CPP (19a) to 17-normanoyl oxide (20a) and the higher inhibitory potency of the norpimarenylamine 26a (K(i) = 0.1 nM) both suggest pimarenyl intermediates having the 13 beta methyl configuration and 8,14-double bond corresponding to sandaracopimaradiene (5a). The 2000-fold stimulation of inhibition by 26a in the presence of inorganic pyrophosphate indicates an important role for carbocation/OPP anion stabilization of the secondary sandaracopimaren-15-yl(+) ion. The failure of 8 beta-hydroxy-17-nor CPP (19b) to undergo enzymatic cyclization was taken as evidence that 9 is bound with a "coplanar" side chain conformation and that the S(N)' cyclization occurs on the 17 alpha face. The routing of the sandarcopimara-15-en-8-yl carbocation toward various diterpenes in biogenetic schemes is attributed to differing conformations of ring C and/or orientations of the C13 vinyl group in the active sites of the corresponding diterpene cyclases.
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Affiliation(s)
- Matthew M Ravn
- Department of Chemistry, University of Illinois, 600 S. Mathews Avenue, Urbana, Illinois 61801, USA
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Miranda MA, Font-Sanchis E, Pérez-Prieto J, Scaiano JC. Two-Photon Generation of the 1,4-Diphenyl-1,4-butanediyl Biradical: Direct Detection and Product Studies. J Org Chem 1999. [DOI: 10.1021/jo990872n] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Miguel A. Miranda
- Instituto de Tecnología Química UPV-CSIC/Departamento de Química, Universidad Politécnica de Valencia, Camino de Vera s/n, Valencia, 46071 Spain, Departamento de Química Orgánica, Facultad de Farmacia, Universidad de Valencia, Vicént Andrés Estellés s/n, Burjassot, 46100 Valencia, Spain, and Department of Chemistry, University of Ottawa, 10 Marie Curie, Ottawa, Ontario K1N6N5, Canada
| | - Enrique Font-Sanchis
- Instituto de Tecnología Química UPV-CSIC/Departamento de Química, Universidad Politécnica de Valencia, Camino de Vera s/n, Valencia, 46071 Spain, Departamento de Química Orgánica, Facultad de Farmacia, Universidad de Valencia, Vicént Andrés Estellés s/n, Burjassot, 46100 Valencia, Spain, and Department of Chemistry, University of Ottawa, 10 Marie Curie, Ottawa, Ontario K1N6N5, Canada
| | - Julia Pérez-Prieto
- Instituto de Tecnología Química UPV-CSIC/Departamento de Química, Universidad Politécnica de Valencia, Camino de Vera s/n, Valencia, 46071 Spain, Departamento de Química Orgánica, Facultad de Farmacia, Universidad de Valencia, Vicént Andrés Estellés s/n, Burjassot, 46100 Valencia, Spain, and Department of Chemistry, University of Ottawa, 10 Marie Curie, Ottawa, Ontario K1N6N5, Canada
| | - J. C. Scaiano
- Instituto de Tecnología Química UPV-CSIC/Departamento de Química, Universidad Politécnica de Valencia, Camino de Vera s/n, Valencia, 46071 Spain, Departamento de Química Orgánica, Facultad de Farmacia, Universidad de Valencia, Vicént Andrés Estellés s/n, Burjassot, 46100 Valencia, Spain, and Department of Chemistry, University of Ottawa, 10 Marie Curie, Ottawa, Ontario K1N6N5, Canada
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