1
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Abstract
The first total synthesis of (+)-pedrolide, a tigliane-derived diterpenoid featuring an unprecedented 5-5-6-6-3 carbon skeleton, is reported. Key to the approach is the construction of the bicyclo[2.2.1]heptane core via an intramolecular cyclopentadiene-Diels-Alder cycloaddition. To this end, a norbornadiene serves as an effective surrogate for cyclopentadiene, which is unmasked under mild conditions involving a complex Diels-Alder reaction cascade. In addition, the synthesis provides a novel approach to a densely functionalized carane in an efficient and enantioselective manner.
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Affiliation(s)
- Marlene Fadel
- Department of Chemistry and Applied Biosciences, Laboratory of Organic Chemistry, ETH Zürich, Vladimir-Prelog-Weg 3, HCI, 8093 Zürich, Switzerland
| | - Erick M Carreira
- Department of Chemistry and Applied Biosciences, Laboratory of Organic Chemistry, ETH Zürich, Vladimir-Prelog-Weg 3, HCI, 8093 Zürich, Switzerland
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2
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Liu B, Xu Y, Luo Z, Xie J. Reductive Aromatization of Quinols with B 2 pin 2 as Deoxidizing Agent. Chem Asian J 2020; 15:1022-1024. [PMID: 32034862 DOI: 10.1002/asia.202000064] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2020] [Indexed: 12/23/2022]
Abstract
We have demonstrated B2 pin2 as superior deoxidizing agent for the reductive deoxygenation of quinol derivatives under basic conditions. A wide range of highly functionalized phenols were obtained in good yields including a complex drug molecule, which revealed the high functional group tolerance of this protocol.
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Affiliation(s)
- Bin Liu
- School of Chemistry and Chemical Engineering, Jiangsu University, Xuefu Road 301, Zhenjiang, 212013, China.,Jurong Ningwu New Material Development Co., Ltd., Zhenjiang, 212405, China
| | - Yin Xu
- School of Chemistry and Chemical Engineering, Jiangsu University, Xuefu Road 301, Zhenjiang, 212013, China
| | - Zhibin Luo
- School of Chemistry and Chemical Engineering, Jiangsu University, Xuefu Road 301, Zhenjiang, 212013, China
| | - Jimin Xie
- School of Chemistry and Chemical Engineering, Jiangsu University, Xuefu Road 301, Zhenjiang, 212013, China
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3
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Jadhav SB, Thopate SB, Nanubolu JB, Chegondi R. Rh-Catalyzed diastereoselective desymmetrization of enone tethered-cyclohexadienones via tandem arylative cyclization. Org Biomol Chem 2019; 17:1937-1946. [DOI: 10.1039/c8ob02284d] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The rhodium-catalyzed arylative cyclization of enone tethered-cyclohexadienones has been developed with high efficiency, thus providing cis-fused bicyclic enones in good yields and with excellent diastereoselectivities.
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Affiliation(s)
- Sandip B. Jadhav
- Department of Organic Synthesis & Process Chemistry
- CSIR-Indian Institute of Chemical Technology (CSIR-IICT)
- Hyderabad 500007
- India
- Academy of Scientific and Innovative Research (AcSIR)
| | - Satish B. Thopate
- Department of Organic Synthesis & Process Chemistry
- CSIR-Indian Institute of Chemical Technology (CSIR-IICT)
- Hyderabad 500007
- India
- Academy of Scientific and Innovative Research (AcSIR)
| | - Jagadeesh Babu Nanubolu
- Department of Organic Synthesis & Process Chemistry
- CSIR-Indian Institute of Chemical Technology (CSIR-IICT)
- Hyderabad 500007
- India
- Academy of Scientific and Innovative Research (AcSIR)
| | - Rambabu Chegondi
- Department of Organic Synthesis & Process Chemistry
- CSIR-Indian Institute of Chemical Technology (CSIR-IICT)
- Hyderabad 500007
- India
- Academy of Scientific and Innovative Research (AcSIR)
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4
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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
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5
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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
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6
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Hu XM, Luo DY, Zi QX, Lin J, Yan SJ. Diastereoselective Synthesis of Morphan Derivatives by Michael and Hetero-Michael Addition of 1,1-Enediamines to Quinone Monoketals. ACS OMEGA 2018; 3:8-21. [PMID: 31457875 PMCID: PMC6641283 DOI: 10.1021/acsomega.7b01493] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/09/2017] [Accepted: 12/19/2017] [Indexed: 05/24/2023]
Abstract
A general and concise method was developed for the synthesis of highly functionalized morphans 3-4 by the Michael and hetero-Michael addition reaction of different types of quinone monoketals 1 and 1,1-enediamines 2 in ethanol or 1,4-dioxane at reflux. This method is suitable for the efficient parallel syntheses of N-containing heterocycles. A library of highly functional morphan derivatives was easily constructed using the Michael/hetero-Michael reaction.
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Affiliation(s)
| | | | | | - Jun Lin
- E-mail: . Phone/Fax: +86 87165031633 (J.L.)
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7
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Gollapelli KK, Donikela S, Manjula N, Chegondi R. Rhodium-Catalyzed Highly Regio- and Enantioselective Reductive Cyclization of Alkyne-Tethered Cyclohexadienones. ACS Catal 2018. [DOI: 10.1021/acscatal.7b04054] [Citation(s) in RCA: 50] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
| | - Sangeetha Donikela
- Academy of Scientific and Innovative Research (AcSIR), New Delhi 110025, India
| | | | - Rambabu Chegondi
- Academy of Scientific and Innovative Research (AcSIR), New Delhi 110025, India
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8
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Anugu RR, Chegondi R. Tunable Diastereoselective Desymmetrization of Cyclohexadienones Triggered by Copper-Catalyzed Three-Component Coupling Reaction. J Org Chem 2017; 82:6786-6794. [DOI: 10.1021/acs.joc.7b00936] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Raghunath Reddy Anugu
- CSIR-Indian Institute of Chemical Technology (CSIR-IICT), Division
of Natural Product Chemistry, Hyderabad 500007, India
- Academy of Scientific and Innovative Research (AcSIR), New
Delhi 110020, India
| | - Rambabu Chegondi
- CSIR-Indian Institute of Chemical Technology (CSIR-IICT), Division
of Natural Product Chemistry, Hyderabad 500007, India
- Academy of Scientific and Innovative Research (AcSIR), New
Delhi 110020, India
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9
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Hsu CS, Fang JM. Synthesis of (+)-Antroquinonol and Analogues by Using Enantioselective Michael Reactions of Benzoquinone Monoketals. European J Org Chem 2016. [DOI: 10.1002/ejoc.201600542] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Che-Sheng Hsu
- Department of Chemistry; National Taiwan University; 106 Taipei Taiwan
| | - Jim-Min Fang
- Department of Chemistry; National Taiwan University; 106 Taipei Taiwan
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10
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Villaume MT, Sella E, Saul G, Borzilleri R, Fargnoli J, Johnston KA, Zhang H, Fereshteh MP, Dhar TGM, Baran PS. Antroquinonol A: Scalable Synthesis and Preclinical Biology of a Phase 2 Drug Candidate. ACS CENTRAL SCIENCE 2016; 2:27-31. [PMID: 27163023 PMCID: PMC4827469 DOI: 10.1021/acscentsci.5b00345] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/23/2015] [Indexed: 06/05/2023]
Abstract
The fungal-derived Taiwanese natural product antroquinonol A has attracted both academic and commercial interest due to its reported exciting biological properties. This reduced quinone is currently in phase II trials (USA and Taiwan) for the treatment of non-small-cell lung carcinoma (NSCLC) and was recently granted orphan drug status by the FDA for the treatment of pancreatic cancer and acute myeloid leukemia. Pending successful completion of human clinical trials, antroquinonol is expected to be commercialized under the trade name Hocena. A synthesis-enabled biological re-examination of this promising natural product, however, reveals minimal in vitro and in vivo antitumor activity in preclinical models.
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Affiliation(s)
- Matthew T. Villaume
- Department
of Chemistry, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United States
| | - Eran Sella
- Department
of Chemistry, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United States
| | - Garrett Saul
- Department
of Chemistry, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United States
| | - Robert
M. Borzilleri
- Departments
of Discovery Chemistry, Oncology Discovery and Leads Discovery &
Optimization, Preclinical Optimization, Bristol-Myers Squibb Co., Route 206 and Province Line Road, Princeton, New Jersey 08543, United States
| | - Joseph Fargnoli
- Departments
of Discovery Chemistry, Oncology Discovery and Leads Discovery &
Optimization, Preclinical Optimization, Bristol-Myers Squibb Co., Route 206 and Province Line Road, Princeton, New Jersey 08543, United States
| | - Kathy A. Johnston
- Departments
of Discovery Chemistry, Oncology Discovery and Leads Discovery &
Optimization, Preclinical Optimization, Bristol-Myers Squibb Co., Route 206 and Province Line Road, Princeton, New Jersey 08543, United States
| | - Haiying Zhang
- Departments
of Discovery Chemistry, Oncology Discovery and Leads Discovery &
Optimization, Preclinical Optimization, Bristol-Myers Squibb Co., Route 206 and Province Line Road, Princeton, New Jersey 08543, United States
| | - Mark P. Fereshteh
- Departments
of Discovery Chemistry, Oncology Discovery and Leads Discovery &
Optimization, Preclinical Optimization, Bristol-Myers Squibb Co., Route 206 and Province Line Road, Princeton, New Jersey 08543, United States
| | - T. G. Murali Dhar
- Departments
of Discovery Chemistry, Oncology Discovery and Leads Discovery &
Optimization, Preclinical Optimization, Bristol-Myers Squibb Co., Route 206 and Province Line Road, Princeton, New Jersey 08543, United States
| | - Phil S. Baran
- Department
of Chemistry, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United States
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11
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Murthy AS, Donikela S, Reddy CS, Chegondi R. Palladium-Catalyzed Regioselective Domino Cyclization of Cyclohexadienones. J Org Chem 2015; 80:5566-71. [DOI: 10.1021/acs.joc.5b00493] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Akondi Srirama Murthy
- Division of Natural Product Chemistry, CSIR-Indian Institute of Chemical Technology, Hyderabad 500007, India
| | - Sangeetha Donikela
- Division of Natural Product Chemistry, CSIR-Indian Institute of Chemical Technology, Hyderabad 500007, India
| | | | - Rambabu Chegondi
- Division of Natural Product Chemistry, CSIR-Indian Institute of Chemical Technology, Hyderabad 500007, India
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12
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Koyanagi Y, Hamada T, Iwagawa T, Okamura H. Asymmetric synthesis of Ampelomin A and ent-Epiampelomin A. J Oleo Sci 2015; 64:449-54. [PMID: 25833454 DOI: 10.5650/jos.ess14212] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
We synthesized the naturally occurring carbasugar ampelomin A and its epimer from a common starting material. The enantiomerically pure starting material was obtained by base-catalyzed asymmetric Diels-Alder reaction of 3-hydroxy-2-pyrone and chiral acrylate. The total yield of ampelomin A was 14% in seven synthetic steps. The key step of the synthesis of ampelomin A was inversion of the stereochemistry at the C-6 position, which was achieved by stereoselective catalytic hydrogenation of the corresponding methylidene group. Further synthesis of the epimer was straightforward, because all stereogenic centers had already been introduced on the starting material; the total yield was 44% in four synthetic steps. Both the final products were obtained in pure form without contamination with undesired isomers. The reported (1)H NMR chemical shift of the C-7 methyl protons and the H-5axial coupling pattern of natural ampelomin A were inconsistent with those of our synthetic product. After careful comparison of the spectra and examination of the stable conformation obtained through MM2 calculations, we present revised NMR data for ampelomin A.
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Affiliation(s)
- Yuji Koyanagi
- Department of Chemistry and Bioscience, Graduate School of Kagoshima University
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13
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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.
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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
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