1
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Hu N, He YT, Lan P, Banwell MG, White LV. Six-step total syntheses of (−)-galanthamine and (−)-. Aust J Chem 2022. [DOI: 10.1071/ch22183] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
The Amaryllidaceae alkaloid (−)-galanthamine (1) is a reversible, competitive acetylcholinesterase inhibitor deployed clinically to treat the dementia associated with Alzheimer’s disease. Here, we describe a six-step synthesis of this natural product from simple, readily accessible starting materials. Enantioselective 1,2-reduction, Mitsunobu coupling, Heck cyclization and diastereoselective allylic oxidation reactions are used in our approach, which provides the shortest synthetic route to compound 1 reported to date. A simple modification to the closing stages of the sequence allows equally facile access to (−)-N-norgalanthamine (2), a compound with a range of distinctive biological properties. The concise and operationally simple synthetic protocols reported here could obviate the need to manipulate naturally sourced galanthamine in the pursuit of analogues required for pharmacological studies.
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2
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Sameem B, Karuso P, Liu F. Hypervalent silicate-assisted azidation approach for the substituted azepane motif. Tetrahedron Lett 2022. [DOI: 10.1016/j.tetlet.2022.154245] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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3
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Evans DA, Beiger JJ, Burch JD, Fuller PH, Glorius F, Kattnig E, Thaisrivongs DA, Trenkle WC, Young JM, Zhang J. Total Synthesis of Aflastatin A. J Am Chem Soc 2022; 144:19953-19972. [PMID: 36269121 DOI: 10.1021/jacs.2c08244] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The total syntheses of aflastatin A and its C3-C48 degradation fragment (6a, R = H) have been accomplished. The syntheses feature several complex diastereoselective fragment couplings, including a Felkin-selective trityl-catalyzed Mukaiyama aldol reaction, a chelate-controlled aldol reaction involving soft enolization with magnesium, and an anti-Felkin-selective boron-mediated oxygenated aldol reaction. Careful comparison of the spectroscopic data for the synthetic C3-C48 degradation fragment to that reported by the isolation group revealed a structural misassignment in the lactol region of the naturally derived degradation product. Ultimately, the data reported for the naturally derived aflastatin A C3-C48 degradation lactol (6a, R = H) were attributed to its derivative lactol trideuteriomethyl ether (6c, R = CD3). Additionally, the revised absolute configurations of six stereogenic centers (C8, C9, and C28-C31) were confirmed.
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Affiliation(s)
- David A Evans
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States
| | - Jason J Beiger
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States
| | - Jason D Burch
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States
| | - Peter H Fuller
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States
| | - Frank Glorius
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States
| | - Egmont Kattnig
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States
| | - David A Thaisrivongs
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States
| | - William C Trenkle
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States
| | - Joseph M Young
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States
| | - Jing Zhang
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States
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4
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Fujioka H. Development of New Innovative Synthetic Organic Chemistry Using Lone Pairs of Oxygen Atoms. Chem Pharm Bull (Tokyo) 2020; 68:907-945. [PMID: 32999145 DOI: 10.1248/cpb.c20-00178] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Oxygen atoms have a lone pair of electrons, so they have high chelation ability, high nucleophilic ability, stabilizing ability of adjacent cations, and take a chelate or oxocarbenium ion structure with Lewis acids and metals. I took advantage of these properties to develop three new reactions, 1) asymmetric synthesis of chiral quaternary carbon centers, 2) asymmetric synthesis using acetal functions, and 3) organic chemistry using acetal-type reactive salt chemical species, and applied them to biologically active natural products synthesis. New reactions described here are all innovative and useful for natural products synthesis. In particular, the first asymmetric synthesis of fredericamycin A, and concise asymmetric synthesis of anthracycline antibiotics, scyphostatin, (+)-Sch 642305, (-)-stenine, clavolonine, (+)-rubrenolide, (+)-rubrynolide, (+)-centrolobine, and decytospolide A and B, etc., are noteworthy. Furthermore, since reactions using acetal-type reactive salt chemical species allow the coexistence of functional groups that normally cannot coexist, the reactions using reactive salts have potential to change the retrosynthesis planned based on conventional reactions.
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Affiliation(s)
- Hiromichi Fujioka
- The Institute of Scientific and Industrial Research, Osaka University
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5
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Ohta R, Matsumoto N, Ueyama Y, Kuboki Y, Aoyama H, Murai K, Arisawa M, Maegawa T, Fujioka H. Highly Discriminative and Chemoselective Deprotection/Transformations of Acetals with the Combination of Trialkylsilyl Triflate/2,4,6-Collidine. J Org Chem 2018; 83:6432-6443. [PMID: 29782161 DOI: 10.1021/acs.joc.8b00675] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Acetals are the most useful protecting groups for carbonyl functional groups. In addition to the role of protection, they can also be used as synthons of carbonyl functions. Previously, we developed a chemoselective deprotection and nucleophilic substitution of acetals from aldehydes in the presence of ketals. This article describes the highly discriminative and chemoselective transformations of acetals bearing different substitution patterns, different types of acetals, as well as mixed acetals. These reactions can achieve the transformations that cannot be attained by conventional methods, and their results strongly suggest the combination of R3SiOTf/2,4,6-collidine to promote such unprecedented phenomena.
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Affiliation(s)
- Reiya Ohta
- Graduate School of Pharmaceutical Sciences , Osaka University , 1-6 Yamada-oka , Suita , Osaka 565-0871 , Japan
| | - Nao Matsumoto
- Graduate School of Pharmaceutical Sciences , Osaka University , 1-6 Yamada-oka , Suita , Osaka 565-0871 , Japan
| | - Yoshifumi Ueyama
- Graduate School of Pharmaceutical Sciences , Osaka University , 1-6 Yamada-oka , Suita , Osaka 565-0871 , Japan
| | - Yuichi Kuboki
- Graduate School of Pharmaceutical Sciences , Osaka University , 1-6 Yamada-oka , Suita , Osaka 565-0871 , Japan
| | - Hiroshi Aoyama
- Graduate School of Pharmaceutical Sciences , Osaka University , 1-6 Yamada-oka , Suita , Osaka 565-0871 , Japan
| | - Kenichi Murai
- Graduate School of Pharmaceutical Sciences , Osaka University , 1-6 Yamada-oka , Suita , Osaka 565-0871 , Japan
| | - Mitsuhiro Arisawa
- Graduate School of Pharmaceutical Sciences , Osaka University , 1-6 Yamada-oka , Suita , Osaka 565-0871 , Japan
| | - Tomohiro Maegawa
- Graduate School of Pharmaceutical Sciences , Osaka University , 1-6 Yamada-oka , Suita , Osaka 565-0871 , Japan
| | - Hiromichi Fujioka
- Graduate School of Pharmaceutical Sciences , Osaka University , 1-6 Yamada-oka , Suita , Osaka 565-0871 , Japan
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6
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El Assal M, Peixoto PA, Coffinier R, Garnier T, Deffieux D, Miqueu K, Sotiropoulos JM, Pouységu L, Quideau S. Synthesis of Scyphostatin Analogues through Hypervalent Iodine-Mediated Phenol Dearomatization. J Org Chem 2017; 82:11816-11828. [DOI: 10.1021/acs.joc.7b02366] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Mourad El Assal
- Univ. Bordeaux, ISM (CNRS−UMR
5255), 351 cours de la
Libération, 33405 Talence Cedex, France
| | - Philippe A. Peixoto
- Univ. Bordeaux, ISM (CNRS−UMR
5255), 351 cours de la
Libération, 33405 Talence Cedex, France
| | - Romain Coffinier
- Univ. Bordeaux, ISM (CNRS−UMR
5255), 351 cours de la
Libération, 33405 Talence Cedex, France
| | - Tony Garnier
- Univ. Bordeaux, ISM (CNRS−UMR
5255), 351 cours de la
Libération, 33405 Talence Cedex, France
| | - Denis Deffieux
- Univ. Bordeaux, ISM (CNRS−UMR
5255), 351 cours de la
Libération, 33405 Talence Cedex, France
| | - Karinne Miqueu
- CNRS/UNIV PAU & PAYS ADOUR, Institut des Sciences Analytiques et de Physico-Chimie pour l’Environnement et les Matériaux (IPREM, UMR 5254), Hélioparc, 2 avenue du Président Angot, 64053 Pau Cedex 09, France
| | - Jean-Marc Sotiropoulos
- CNRS/UNIV PAU & PAYS ADOUR, Institut des Sciences Analytiques et de Physico-Chimie pour l’Environnement et les Matériaux (IPREM, UMR 5254), Hélioparc, 2 avenue du Président Angot, 64053 Pau Cedex 09, France
| | - Laurent Pouységu
- Univ. Bordeaux, ISM (CNRS−UMR
5255), 351 cours de la
Libération, 33405 Talence Cedex, France
| | - Stéphane Quideau
- Univ. Bordeaux, ISM (CNRS−UMR
5255), 351 cours de la
Libération, 33405 Talence Cedex, France
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7
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Algera RF, Ma Y, Collum DB. Sodium Diisopropylamide in Tetrahydrofuran: Selectivities, Rates, and Mechanisms of Alkene Isomerizations and Diene Metalations. J Am Chem Soc 2017; 139:11544-11549. [PMID: 28735535 PMCID: PMC6059566 DOI: 10.1021/jacs.7b05218] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Sodium diisopropylamide in tetrahydrofuran is an effective base for the metalation of 1,4-dienes and isomerization of alkenes. Dienes metalate via tetrasolvated sodium amide monomers, whereas 1-pentene is isomerized by trisolvated monomers. Facile, highly Z-selective isomerizations are observed for allyl ethers under conditions that compare favorably to those of existing protocols. The selectivity is independent of the substituents on the allyl ethers; rate and computational data show that the rates, mechanisms, and roles of sodium-oxygen contacts are substituent-dependent. The competing influences of substrate coordination and solvent coordination to sodium are discussed.
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Affiliation(s)
- Russell F Algera
- Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University , Ithaca, New York 14853-1301, United States
| | - Yun Ma
- Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University , Ithaca, New York 14853-1301, United States
| | - David B Collum
- Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University , Ithaca, New York 14853-1301, United States
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8
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Mailyan AK, Eickhoff JA, Minakova AS, Gu Z, Lu P, Zakarian A. Cutting-Edge and Time-Honored Strategies for Stereoselective Construction of C–N Bonds in Total Synthesis. Chem Rev 2016; 116:4441-557. [DOI: 10.1021/acs.chemrev.5b00712] [Citation(s) in RCA: 111] [Impact Index Per Article: 13.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Artur K. Mailyan
- Department
of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106, United States
| | - John A. Eickhoff
- Department
of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106, United States
| | - Anastasiia S. Minakova
- Department
of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106, United States
| | - Zhenhua Gu
- Department
of Chemistry, University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui 230026, China
| | - Ping Lu
- Department
of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106, United States
| | - Armen Zakarian
- Department
of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106, United States
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9
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Sawama Y, Masuda M, Honda A, Yokoyama H, Park K, Yasukawa N, Monguchi Y, Sajiki H. Additional Nucleophile-Free FeCl 3-Catalyzed Green Deprotection of 2,4-Dimethoxyphenylmethyl-Protected Alcohols and Carboxylic Acids. Chem Pharm Bull (Tokyo) 2016; 64:778-84. [DOI: 10.1248/cpb.c16-00161] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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10
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Sawama Y, Masuda M, Asai S, Goto R, Nagata S, Nishimura S, Monguchi Y, Sajiki H. FeCl3-Catalyzed Self-Cleaving Deprotection of Methoxyphenylmethyl-Protected Alcohols. Org Lett 2015; 17:434-7. [DOI: 10.1021/acs.orglett.5b00106] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yoshinari Sawama
- Laboratory
of Organic Chemistry, Gifu Pharmaceutical University, 1-25-4 Daigaku-nishi, Gifu 501-1196, Japan
| | - Masahiro Masuda
- Laboratory
of Organic Chemistry, Gifu Pharmaceutical University, 1-25-4 Daigaku-nishi, Gifu 501-1196, Japan
| | - Shota Asai
- Laboratory
of Organic Chemistry, Gifu Pharmaceutical University, 1-25-4 Daigaku-nishi, Gifu 501-1196, Japan
| | - Ryota Goto
- Laboratory
of Organic Chemistry, Gifu Pharmaceutical University, 1-25-4 Daigaku-nishi, Gifu 501-1196, Japan
| | - Saori Nagata
- Laboratory
of Organic Chemistry, Gifu Pharmaceutical University, 1-25-4 Daigaku-nishi, Gifu 501-1196, Japan
| | - Shumma Nishimura
- Laboratory
of Organic Chemistry, Gifu Pharmaceutical University, 1-25-4 Daigaku-nishi, Gifu 501-1196, Japan
| | - Yasunari Monguchi
- Laboratory
of Organic Chemistry, Gifu Pharmaceutical University, 1-25-4 Daigaku-nishi, Gifu 501-1196, Japan
| | - Hironao Sajiki
- Laboratory
of Organic Chemistry, Gifu Pharmaceutical University, 1-25-4 Daigaku-nishi, Gifu 501-1196, Japan
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11
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Kuwata K, Suzuki M, Inami Y, Hanaya K, Sugai T, Shoji M. Stereoselective synthesis of scyphostatin hydrophilic moiety. Tetrahedron Lett 2014. [DOI: 10.1016/j.tetlet.2014.03.077] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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12
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Sivakumari T, Chadha A. Regio- and enantio-selective oxidation of diols by Candida parapsilosis ATCC 7330. RSC Adv 2014. [DOI: 10.1039/c4ra08146c] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Optically pure (S)-diols and their corresponding hydroxy ketones were prepared via regio- and enantio-selective oxidation of the corresponding diols using whole cells of Candida parapsilosis ATCC 7330.
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Affiliation(s)
| | - Anju Chadha
- Laboratory of Bioorganic Chemistry
- Department of Biotechnology
- IIT Madras
- , India
- National Center for Catalysis Research
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13
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Oda M, Imagawa H, Kato R, Yabiku K, Yoshikawa T, Takemoto T, Takahashi H, Yamamoto H, Nishizawa M, Sakurai J, Nagahama M. Novel inhibitor of bacterial sphingomyelinase, SMY-540, developed based on three-dimensional structure analysis. J Enzyme Inhib Med Chem 2013; 29:303-10. [DOI: 10.3109/14756366.2013.777717] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
| | - Hiroshi Imagawa
- Department of Chemistry of Functional Molecules, Faculty of Pharmaceutical Sciences, Tokushima Bunri University
Yamashiro-cho, TokushimaJapan
| | | | | | - Tomomi Yoshikawa
- Department of Chemistry of Functional Molecules, Faculty of Pharmaceutical Sciences, Tokushima Bunri University
Yamashiro-cho, TokushimaJapan
| | - Takayuki Takemoto
- Department of Chemistry of Functional Molecules, Faculty of Pharmaceutical Sciences, Tokushima Bunri University
Yamashiro-cho, TokushimaJapan
| | - Hironobu Takahashi
- Institute of Pharmacognosy, Tokushima Bunri University
Yamashiro-cho, TokushimaJapan
| | - Hirofumi Yamamoto
- Department of Chemistry of Functional Molecules, Faculty of Pharmaceutical Sciences, Tokushima Bunri University
Yamashiro-cho, TokushimaJapan
| | - Mugio Nishizawa
- Department of Chemistry of Functional Molecules, Faculty of Pharmaceutical Sciences, Tokushima Bunri University
Yamashiro-cho, TokushimaJapan
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14
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Mehta G, Modugu NR. Concise Approach to the Carbocyclic Core of the Naturally Occurring Sphingomyelinase Inhibitor Scyphostatin. J Org Chem 2013; 78:3367-73. [DOI: 10.1021/jo3028196] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Goverdhan Mehta
- School of Chemistry, University of Hyderabad, Hyderabad 500 046, India
| | - Nagi Reddy Modugu
- School of Chemistry, University of Hyderabad, Hyderabad 500 046, India
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15
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Maegawa T, Fujioka H. Reaction via Pyridinium-type Salt Intermediate: Chemoselective Deprotection of Acetals in the Presence of Ketals and Nucleophilic Substitution. J SYN ORG CHEM JPN 2013. [DOI: 10.5059/yukigoseikyokaishi.71.694] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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16
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Fujioka H, Nakahara K, Kotoku N, Ohba Y, Nagatomi Y, Wang TL, Sawama Y, Murai K, Hirano K, Oki T, Wakamatsu S, Kita Y. Asymmetric Total Synthesis of (−)-Stenine and 9a-epi-Stenine. Chemistry 2012; 18:13861-70. [DOI: 10.1002/chem.201200376] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2012] [Revised: 07/14/2012] [Indexed: 11/11/2022]
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17
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Fraser CJ, Howell GP, Harrity JPA. A furan Diels–Alder cycloaddition approach to scyphostatin analogues. Org Biomol Chem 2012; 10:9058-66. [DOI: 10.1039/c2ob26793d] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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18
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19
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Nakahara K, Hirano K, Maehata R, Kita Y, Fujioka H. Asymmetric Total Synthesis of Clavolonine. Org Lett 2011; 13:2015-7. [DOI: 10.1021/ol200376z] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- Kenji Nakahara
- Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamada-oka, Suita, Osaka, 565-0871 Japan
| | - Kie Hirano
- Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamada-oka, Suita, Osaka, 565-0871 Japan
| | - Ryota Maehata
- Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamada-oka, Suita, Osaka, 565-0871 Japan
| | - Yasuyuki Kita
- Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamada-oka, Suita, Osaka, 565-0871 Japan
| | - Hiromichi Fujioka
- Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamada-oka, Suita, Osaka, 565-0871 Japan
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20
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Jana R, Pathak TP, Sigman MS. Advances in transition metal (Pd, Ni, Fe)-catalyzed cross-coupling reactions using alkyl-organometallics as reaction partners. Chem Rev 2011; 111:1417-92. [PMID: 21319862 PMCID: PMC3075866 DOI: 10.1021/cr100327p] [Citation(s) in RCA: 1666] [Impact Index Per Article: 128.2] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Ranjan Jana
- Department of Chemistry, University of Utah, 315 South 1400 East, Salt Lake City, Utah 84112-8500
| | - Tejas P. Pathak
- Department of Chemistry, University of Utah, 315 South 1400 East, Salt Lake City, Utah 84112-8500
| | - Matthew S. Sigman
- Department of Chemistry, University of Utah, 315 South 1400 East, Salt Lake City, Utah 84112-8500
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21
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Cha JY, Burnett GL, Huang Y, Davidson JB, Pettus TRR. A strategy for the late-stage divergent syntheses of scyphostatin analogues. J Org Chem 2011; 76:1361-71. [PMID: 21250721 PMCID: PMC3071563 DOI: 10.1021/jo102327e] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
This account details the synthesis of two scyphostatin analogues exhibiting a reactive polar epoxycyclohexenone core and various amide side chains outfitted for late-stage chemical derivatization into the desirable lipophilic tails. Our efforts highlight a key ipso-dearomatization process and provide new insights regarding the incompatibility and orthogonal reactivity of scyphostatin's functional groups. We further showcase the utility of resorcinol derived 2,5-cyclohexadienones as synthetic platforms capable of participating in selective chemical reactivity, and we further demonstrate their potential for rapid elaboration into complex structural motifs.
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Affiliation(s)
- Jacob Y. Cha
- Department of Chemistry and Biochemistry, University of California at Santa Barbara, Santa Barbara, California 93106, United States
| | - G. Leslie Burnett
- Department of Chemistry and Biochemistry, University of California at Santa Barbara, Santa Barbara, California 93106, United States
| | - Yaodong Huang
- Department of Chemistry and Biochemistry, University of California at Santa Barbara, Santa Barbara, California 93106, United States
| | | | - Thomas R. R. Pettus
- Department of Chemistry and Biochemistry, University of California at Santa Barbara, Santa Barbara, California 93106, United States
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22
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Bartoli A, Rodier F, Commeiras L, Parrain JL, Chouraqui G. Construction of spirolactones with concomitant formation of the fused quaternary centre – application to the synthesis of natural products. Nat Prod Rep 2011; 28:763-82. [DOI: 10.1039/c0np00053a] [Citation(s) in RCA: 86] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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23
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Fujioka H, Nakahara K, Hirose H, Hirano K, Oki T, Kita Y. Intramolecular iodoetherification of ene or diene ketals: facile synthesis of spiroketals. Chem Commun (Camb) 2010; 47:1060-2. [PMID: 21076755 DOI: 10.1039/c0cc03933k] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A novel and rapid approach to chiral mono- or di-substituted spiroketals based on remote asymmetric induction by intramolecular iodoetherification of ene or diene ketals has been developed. This strategy concisely offers 5,5- and 5,6-spiroketals including the natural insect pheromone of the wasp.
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Affiliation(s)
- Hiromichi Fujioka
- Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamada-oka, Suita, Osaka, 565-0871, Japan.
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24
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Imagawa H, Oda M, Takemoto T, Yamauchi R, Yoshikawa T, Yamamoto H, Nishizawa M, Takahashi H, Hashimoto M, Yabiku K, Nagahama M, Sakurai J. Synthesis and evaluation of novel phosphate ester analogs as neutral sphingomyelinase inhibitors. Bioorg Med Chem Lett 2010; 20:3868-71. [PMID: 20627555 DOI: 10.1016/j.bmcl.2010.05.042] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2010] [Revised: 05/08/2010] [Accepted: 05/12/2010] [Indexed: 11/28/2022]
Abstract
A novel sphingomyelin inhibitor RY221B-a, which contains a bipyridyl moiety as a metal coordination site was designed based upon the mechanism of phosphate ester hydrolysis. RY221B-a was synthesized from N-Boc-sphingosine in three steps via selective etherification using stannyl acetal. Synthesized RY221B-a exhibited relatively-strong inhibitory activity against Bc-SMase (IC(50)=1.2microM).
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25
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26
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Diastereoselective Desymmetrization of Symmetric Dienes and its Synthetic Application. Symmetry (Basel) 2010. [DOI: 10.3390/sym2020437] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
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27
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Cha JY, Huang Y, Pettus TRR. Total synthesis of TK-57-164A, isariotin F, and their putative progenitor isariotin E. Angew Chem Int Ed Engl 2010; 48:9519-21. [PMID: 19921667 DOI: 10.1002/anie.200904716] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Jacob Y Cha
- Department of Chemistry and Biochemistry, University of California, Santa Barbara, Santa Barbara, CA 93106-9510, USA
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28
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Pitsinos E, Athinaios N, Xu Z, Wang G, Negishi EI. Total synthesis of (+)-scyphostatin featuring an enantioselective and highly efficient route to the side-chain via Zr-catalyzed asymmetric carboalumination of alkenes (ZACA). Chem Commun (Camb) 2010; 46:2200-2. [PMID: 20234905 DOI: 10.1039/b920261g] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
(+)-Scyphostatin (1) was synthesized via (i) construction of a side-chain 3b of > or = 98% purity in 19% yield in eleven steps featuring ZACA reaction, Negishi coupling, and HWE olefination, (ii) an asymmetric synthesis of a fully protected core 4 from 10a, and (iii) a three-step assembly of 1 in 42% yield.
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Affiliation(s)
- Emmanuel Pitsinos
- Laboratory of Natural Products Synthesis & Bioorganic Chemistry, Institute of Physical Chemistry, NCSR DEMOKRITOS, P.O. Box 60228, GR 153 10, Aghia Paraskevi, Greece.
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29
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Hoye TR, Jeffrey CS, Nelson DP. Dynamic kinetic resolution during a vinylogous Payne rearrangement: a concise synthesis of the polar pharmacophoric subunit of (+)-scyphostatin. Org Lett 2010; 12:52-5. [PMID: 19968321 PMCID: PMC2804749 DOI: 10.1021/ol902459z] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The diastereomeric epoxycyclohexenols 3a/b (obtained via a Wharton rearrangement of a bis-epoxycyclohexanone precursor) were shown to undergo interconversion via a facile vinylogous Payne rearrangement. Mechanistic issues were probed; the doubly O-deuterated analogues underwent this equilibration more slowly than the parent dihydroxy compounds. It was possible to kinetically resolve the mixture of 3a/b under equilibrating conditions by use of Amano PS. This DKR is additionally noteworthy because it sets four stereocenters in a single event.
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Affiliation(s)
- Thomas R Hoye
- Department of Chemistry, 207 Pleasant Street, SE, University of Minnesota, Minneapolis, Minnesota 55455, USA.
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Cha J, Huang Y, Pettus T. Total Synthesis of TK-57-164A, Isariotin F, and Their Putative Progenitor Isariotin E. Angew Chem Int Ed Engl 2009. [DOI: 10.1002/ange.200904716] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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31
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Fujioka H, Kita Y. Stereocontrol between Remote Atom Centers Using Chiral Acetals and its Application to Asymmetric Syntheses of Natural Products. J SYN ORG CHEM JPN 2009. [DOI: 10.5059/yukigoseikyokaishi.67.606] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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32
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Thiery E, Le Bras J, Muzart J. Reactivity versus Stability of Oxiranes under Palladium‐Catalyzed Reductive Conditions. European J Org Chem 2008. [DOI: 10.1002/ejoc.200800739] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Emilie Thiery
- Institut de Chimie Moléculaire de Reims, UMR 6229, CNRS – Université de Reims Champagne‐Ardenne, B. P. 1039, 51687 Reims Cedex 2, France, Fax: +33‐3‐26913166
| | - Jean Le Bras
- Institut de Chimie Moléculaire de Reims, UMR 6229, CNRS – Université de Reims Champagne‐Ardenne, B. P. 1039, 51687 Reims Cedex 2, France, Fax: +33‐3‐26913166
| | - Jacques Muzart
- Institut de Chimie Moléculaire de Reims, UMR 6229, CNRS – Université de Reims Champagne‐Ardenne, B. P. 1039, 51687 Reims Cedex 2, France, Fax: +33‐3‐26913166
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