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1
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Total Synthesis of (−)-Actinophyllic Acid Enabled by a Key Dual Ir/Amine-Catalyzed Allylation. Org Lett 2018; 20:4575-4578. [PMID: 30003787 DOI: 10.1021/acs.orglett.8b01861] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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2
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Xue F, Lu H, He L, Li W, Zhang D, Liu XY, Qin Y. Formal Total Syntheses of (−)- and (+)-Actinophyllic Acid. J Org Chem 2018; 83:754-764. [PMID: 29283259 DOI: 10.1021/acs.joc.7b02747] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Fei Xue
- Key Laboratory of Drug Targeting and
Drug Delivery Systems of the Ministry of Education, West China School
of Pharmacy, Sichuan University, Chengdu 610041, P. R. China
| | - Huifang Lu
- Key Laboratory of Drug Targeting and
Drug Delivery Systems of the Ministry of Education, West China School
of Pharmacy, Sichuan University, Chengdu 610041, P. R. China
| | - Liping He
- Key Laboratory of Drug Targeting and
Drug Delivery Systems of the Ministry of Education, West China School
of Pharmacy, Sichuan University, Chengdu 610041, P. R. China
| | - Wenfei Li
- Key Laboratory of Drug Targeting and
Drug Delivery Systems of the Ministry of Education, West China School
of Pharmacy, Sichuan University, Chengdu 610041, P. R. China
| | - Dan Zhang
- Key Laboratory of Drug Targeting and
Drug Delivery Systems of the Ministry of Education, West China School
of Pharmacy, Sichuan University, Chengdu 610041, P. R. China
| | - Xiao-Yu Liu
- Key Laboratory of Drug Targeting and
Drug Delivery Systems of the Ministry of Education, West China School
of Pharmacy, Sichuan University, Chengdu 610041, P. R. China
| | - Yong Qin
- Key Laboratory of Drug Targeting and
Drug Delivery Systems of the Ministry of Education, West China School
of Pharmacy, Sichuan University, Chengdu 610041, P. R. China
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3
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Affiliation(s)
- Yu Yoshii
- Department of Chemistry; Seoul National University; Gwanak-1 Gwanak-ro, Gwanak-gu Seoul 151-742 South Korea
- Graduate School of Pharmaceutical Sciences; Tohoku University; Aoba, Aramaki, Aoba-ku Sendai 980-8578 Japan
| | - Hidetoshi Tokuyama
- Graduate School of Pharmaceutical Sciences; Tohoku University; Aoba, Aramaki, Aoba-ku Sendai 980-8578 Japan
| | - David Y.-K. Chen
- Department of Chemistry; Seoul National University; Gwanak-1 Gwanak-ro, Gwanak-gu Seoul 151-742 South Korea
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4
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Yoshii Y, Tokuyama H, Chen DYK. Total Synthesis of Actinophyllic Acid. Angew Chem Int Ed Engl 2017; 56:12277-12281. [DOI: 10.1002/anie.201706312] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2017] [Indexed: 11/07/2022]
Affiliation(s)
- Yu Yoshii
- Department of Chemistry; Seoul National University; Gwanak-1 Gwanak-ro, Gwanak-gu Seoul 151-742 South Korea
- Graduate School of Pharmaceutical Sciences; Tohoku University; Aoba, Aramaki, Aoba-ku Sendai 980-8578 Japan
| | - Hidetoshi Tokuyama
- Graduate School of Pharmaceutical Sciences; Tohoku University; Aoba, Aramaki, Aoba-ku Sendai 980-8578 Japan
| | - David Y.-K. Chen
- Department of Chemistry; Seoul National University; Gwanak-1 Gwanak-ro, Gwanak-gu Seoul 151-742 South Korea
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5
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Xue F, Xiao T, Li M, Zhang KF, He LP, Qin Y, Liu XY, Zhang D. Asymmetric approach towards the total synthesis of (+)-actinopyllic acid. Tetrahedron 2017. [DOI: 10.1016/j.tet.2017.02.058] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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6
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Abstract
Described herein is a catalytic asymmetric total synthesis of (-)-actinophyllic acid, with the key step being a chiral phosphine-catalyzed [3 + 2] annulation between an imine and an allenoate to form a pyrroline intermediate in 99% yield and 94% ee. The synthesis also features CuI-catalyzed coupling between a ketoester and a 2-iodoindole to shape the tetrahydroazocine ring; intramolecular alkylative lactonization; SmI2-mediated intramolecular pinacol coupling between ketone and lactone subunits to assemble the complex skeleton of (-)-actinophyllic acid; and an unprecedented regioselective dehydroxylation.
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Affiliation(s)
- Lingchao Cai
- Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095-1569, United States
| | - Kui Zhang
- Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095-1569, United States
| | - Ohyun Kwon
- Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095-1569, United States
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7
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Lofstrand VA, Matsuura BS, Furst L, Narayanam JMR, Stephenson CRJ. Formation and Trapping of Azafulvene Intermediates Derived from Manganese-Mediated Oxidative Malonate Coupling. Tetrahedron 2016; 72:3775-3780. [PMID: 27551160 DOI: 10.1016/j.tet.2016.03.012] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The one-pot, three-component, coupling reaction of indoles/pyrroles, dimethyl malonate, and acetic acid was performed using Mn(III) acetate as an oxidant. In the presence of Mn(OAc)3, indole-2, and indole-3-carbonyl compounds were alkylated at the 3- and 2- positions, respectively, with subsequent oxidation and nucleophilic capture occurring at the newly formed benzylic carbon. In contrast, oxidation of 2- and 3-indole carboxylic acids afforded the corresponding 2-oxindol-3-ylidenes and 3-oxindol-2-ylidenes. The reaction conditions, scope, and mechanism are discussed herein.
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Affiliation(s)
- Verner A Lofstrand
- Department of Chemistry, University of Michigan, 930 N. University Ave., Ann Arbor, MI 48109, USA
| | - Bryan S Matsuura
- Department of Chemistry, University of Michigan, 930 N. University Ave., Ann Arbor, MI 48109, USA
| | - Laura Furst
- Department of Chemistry, University of Michigan, 930 N. University Ave., Ann Arbor, MI 48109, USA
| | - Jagan M R Narayanam
- Department of Chemistry, University of Michigan, 930 N. University Ave., Ann Arbor, MI 48109, USA
| | - Corey R J Stephenson
- Department of Chemistry, University of Michigan, 930 N. University Ave., Ann Arbor, MI 48109, USA
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8
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Abstract
A concise total synthesis of the complex indole alkaloid (±)-actinophyllic acid was accomplished by a sequence of reactions requiring only 10 steps from readily-available, known starting materials. The approach featured a Lewis acid-catalyzed cascade of reactions involving stabilized carbocations that delivered the tetracyclic core of the natural product in a single chemical operation. Optimal conversion of this key intermediate into (±)-actinophyllic acid required judicious selection of a protecting group strategy.
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Affiliation(s)
- Brett A. Granger
- Department of Chemistry, The University of Texas at Austin, 1 University Station A5300, Austin, Texas 78712-0165, USA
| | - Ivan T. Jewett
- Department of Chemistry, The University of Texas at Austin, 1 University Station A5300, Austin, Texas 78712-0165, USA
| | - Jeffrey D. Butler
- Department of Chemistry, The University of Texas at Austin, 1 University Station A5300, Austin, Texas 78712-0165, USA
| | - Stephen F. Martin
- Department of Chemistry, The University of Texas at Austin, 1 University Station A5300, Austin, Texas 78712-0165, USA
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9
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Mortimer D, Whiting M, Harrity JP, Jones S, Coldham I. Synthesis of an azabicyclic framework towards (±)-actinophyllic acid. Tetrahedron Lett 2014. [DOI: 10.1016/j.tetlet.2014.01.019] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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10
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Kuttruff CA, Eastgate MD, Baran PS. Natural product synthesis in the age of scalability. Nat Prod Rep 2014; 31:419-32. [DOI: 10.1039/c3np70090a] [Citation(s) in RCA: 117] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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11
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Granger BA, Jewett IT, Butler JD, Hua B, Knezevic CE, Parkinson EI, Hergenrother PJ, Martin SF. Synthesis of (±)-Actinophyllic Acid and Analogs: Applications of Cascade Reactions and Diverted Total Synthesis. J Am Chem Soc 2013; 135:12984-6. [DOI: 10.1021/ja4070206] [Citation(s) in RCA: 62] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Brett A. Granger
- Department of Chemistry and
Biochemistry, The University of Texas at Austin, Austin, Texas 78712, United States
| | - Ivan T. Jewett
- Department of Chemistry and
Biochemistry, The University of Texas at Austin, Austin, Texas 78712, United States
| | - Jeffrey D. Butler
- Department of Chemistry and
Biochemistry, The University of Texas at Austin, Austin, Texas 78712, United States
| | - Bruce Hua
- Department of Chemistry and
Biochemistry, The University of Texas at Austin, Austin, Texas 78712, United States
| | - Claire E. Knezevic
- Roger Adams Laboratory, Department
of Chemistry, University of Illinois at Urbana−Champaign, Urbana, Illinois 61801, United States
| | - Elizabeth I. Parkinson
- Roger Adams Laboratory, Department
of Chemistry, University of Illinois at Urbana−Champaign, Urbana, Illinois 61801, United States
| | - Paul J. Hergenrother
- Roger Adams Laboratory, Department
of Chemistry, University of Illinois at Urbana−Champaign, Urbana, Illinois 61801, United States
| | - Stephen F. Martin
- Department of Chemistry and
Biochemistry, The University of Texas at Austin, Austin, Texas 78712, United States
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