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Cheng B, Wang Q, An Y, Chen F. Recent advances in the total synthesis of galantamine, a natural medicine for Alzheimer's disease. Nat Prod Rep 2024; 41:1060-1090. [PMID: 38450550 DOI: 10.1039/d4np00001c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/08/2024]
Abstract
Covering: 2006 to 2023(-)-Galantamine is a natural product with distinctive structural features and potent inhibitory activity against acetylcholine esterase (AChE). It is clinically approved for the treatment of Alzheimer's disease. The clinical significance and scarcity of this natural product have prompted extensive and ongoing efforts towards the chemical synthesis of this challenging tetracyclic structure. The objective of this review is to summarize and discuss recent progress in the total synthesis of galantamine from 2006 to 2023. The contents are organized according to the synthetic strategies for the construction of the quaternary center. Key features of each synthesis have been highlighted, followed by a summary and outlook at the end.
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Affiliation(s)
- Bichu Cheng
- Engineering Center of Catalysis and Synthesis for Chiral Molecules, Department of Chemistry, Fudan University, Shanghai 200433, China.
- School of Science, Green Pharmaceutical Engineering Research Center, Harbin Institute of Technology, Shenzhen 518055, China
| | - Qi Wang
- School of Science, Green Pharmaceutical Engineering Research Center, Harbin Institute of Technology, Shenzhen 518055, China
| | - Yi An
- Engineering Center of Catalysis and Synthesis for Chiral Molecules, Department of Chemistry, Fudan University, Shanghai 200433, China.
| | - Fener Chen
- Engineering Center of Catalysis and Synthesis for Chiral Molecules, Department of Chemistry, Fudan University, Shanghai 200433, China.
- College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang, Jiangxi 330022, China
- School of Science, Green Pharmaceutical Engineering Research Center, Harbin Institute of Technology, Shenzhen 518055, China
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2
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Barik R, Nanda S. Asymmetric total synthesis of humulane sesquiterpenoids alashanoids B, C, E, and F and 2,9-humuladien-6-ol-8-one. Org Biomol Chem 2024; 22:4478-4487. [PMID: 38625093 DOI: 10.1039/d4ob00393d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/17/2024]
Abstract
Naturally occurring sesquiterpenes having humulane frameworks are structurally intriguing and possess significant biological profiles. Asymmetric synthesis of the alashanoids B, C, E, and F and 2,9-humuladien-6-ol-8-one is achieved for the first time through a linear synthetic strategy. Intramolecular late-stage Nozaki-Hiyama-Kishi (NHK) coupling is employed to access the eleven-membered macrocyclic core present in the target molecules. The NHK precursors are accessed using the Evans and non-Evans syn and anti-aldol reaction as a key transformation. X-ray and ECD analysis reconfirmed the synthesized compounds' structures and chirotopical properties.
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Affiliation(s)
- Rasmita Barik
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur, 721302, India.
| | - Samik Nanda
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur, 721302, India.
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3
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Bautista DD, Reyes MAV, González EAB, Bugarin A. Synthetic Approaches to α-, β-, γ-, and δ-lycoranes. European J Org Chem 2023; 26:e202300404. [PMID: 37927304 PMCID: PMC10624333 DOI: 10.1002/ejoc.202300404] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2023] [Indexed: 11/07/2023]
Abstract
Lycorane is a pentacyclic core presented in alkaloids isolated from the Amaryllidaceae family of herbaceous flowering plants. Members of this class of natural products have shown to display important biological properties including analgesic, antiviral, and antiproliferative activities. This review presents the known synthetic routes toward α-, β-, γ-, and δ-lycoranes. α-(19 routes), β-(10 routes), γ-(38 routes), and δ-(6 routes).
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Affiliation(s)
- Diego Díaz Bautista
- Universidad Juárez Autónoma de Tabasco, Division Académica de Ciencias Básicas, carretera Cunduacán-Jalpa Km. 0.5, Cunduacán Tabasco 86690, México
| | - Miguel A Vilchis Reyes
- Universidad Juárez Autónoma de Tabasco, Division Académica de Ciencias Básicas, carretera Cunduacán-Jalpa Km. 0.5, Cunduacán Tabasco 86690, México
| | - Ever A Blé González
- Universidad Juárez Autónoma de Tabasco, Division Académica de Ciencias Básicas, carretera Cunduacán-Jalpa Km. 0.5, Cunduacán Tabasco 86690, México
- Department of Chemistry and Physics, Florida Gulf Coast University, 10501 FGCU Boulevard South, Fort Myers, FL, 33965
| | - Alejandro Bugarin
- Department of Chemistry and Physics, Florida Gulf Coast University, 10501 FGCU Boulevard South, Fort Myers, FL, 33965
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4
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Reshuffle Bonds by Ball Milling: A Mechanochemical Protocol for Charge-Accelerated Aza-Claisen Rearrangements. Molecules 2023; 28:molecules28020807. [PMID: 36677865 PMCID: PMC9860570 DOI: 10.3390/molecules28020807] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2022] [Revised: 01/02/2023] [Accepted: 01/07/2023] [Indexed: 01/15/2023] Open
Abstract
This study presents the development of a mechanochemical protocol for a charge-accelerated aza-Claisen rearrangement. The protocol waives the use of commonly applied transition metals, ligands, or pyrophoric Lewis acids, e.g., AlMe3. Based on (heterocyclic) tertiary allylamines and acyl chlorides, the desired tertiary amides were prepared in yields ranging from 17% to 84%. Moreover, the same protocol was applied for a Belluš-Claisen-type rearrangement resulting in the synthesis of a 9-membered lactam without further optimization.
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5
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Reactions of dimedone and alkyl orthoformates with and without activators. Russ Chem Bull 2022. [DOI: 10.1007/s11172-022-3652-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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6
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Halang M, Maier ME. Formal Total Synthesis of Salvinorin A. ChemistryOpen 2022; 11:e202200015. [PMID: 35218166 PMCID: PMC9535499 DOI: 10.1002/open.202200015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2022] [Revised: 02/08/2022] [Indexed: 11/17/2022] Open
Abstract
The generation of the quaternary stereocenter at the C9 position of salvinorin A precursors by the Claisen rearrangement was investigated. The required allyl alcohol was prepared from a Wieland-Miescher ketone using a known γ-hydroxylation, reduction of the enone double bond, cyanohydrin formation, and elimination, yielding an unsaturated nitrile. A two-step reduction led to the required allyl alcohol. The subsequent Johnson-Claisen rearrangement provided a mixture of two diastereomeric 1,4-unsaturated esters in a ratio of around 2.6 : 1. The major isomer could be converted to a key intermediate of the Hagiwara synthesis of salvinorin A.
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Affiliation(s)
- Marc Halang
- Institut für Organische ChemieEberhard Karls Universität TübingenAuf der Morgenstelle 1872076TübingenGermany
| | - Martin E. Maier
- Institut für Organische ChemieEberhard Karls Universität TübingenAuf der Morgenstelle 1872076TübingenGermany
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7
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Majumder S, Yadav A, Pal S, Khatua A, Bisai A. Asymmetric Total Syntheses of (-)-Lycoramine, (-)-Lycoraminone, (-)-Narwedine, and (-)-Galanthamine. J Org Chem 2022; 87:7786-7797. [PMID: 35613361 DOI: 10.1021/acs.joc.2c00420] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A concise asymmetric total synthesis of naturally occurring Amaryllidaceae alkaloids sharing dihydrobenzofuran scaffolds, (-)-galanthamine (1a), (-)-lycoramine (1b), (-)-narwedine (2a), and (-)-lycoraminone (2b), is reported. Orthoester Johnson-Claisen rearrangement of allyl alcohol (+)-9 (98% ee) in diisopropylethylamine furnished enantioenriched cyclohexene (+)-8 (97.4% ee) with a quaternary stereogenic center.
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Affiliation(s)
- Satyajit Majumder
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal Bypass Road, Bhauri, Bhopal 462 066, Madhya Pradesh, India
| | - Abhinay Yadav
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal Bypass Road, Bhauri, Bhopal 462 066, Madhya Pradesh, India
| | - Souvik Pal
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal Bypass Road, Bhauri, Bhopal 462 066, Madhya Pradesh, India
| | - Arindam Khatua
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal Bypass Road, Bhauri, Bhopal 462 066, Madhya Pradesh, India
| | - Alakesh Bisai
- Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur, Kalyani, Nadia 741 246, West Bengal, India
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Fraga R, Len K, Lutzing R, Laverny G, Loureiro J, Maestro MA, Rochel N, Rodriguez‐Borges E, Mouriño A. Design, Synthesis, Evaluation and Structure of Allenic 1α,25-Dihydroxyvitamin D 3 Analogs with Locked Mobility at C-17. Chemistry 2021; 27:13384-13389. [PMID: 34224173 PMCID: PMC8519077 DOI: 10.1002/chem.202101578] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2021] [Indexed: 11/07/2022]
Abstract
Vitamin D receptor ligands have potential for the treatment of hyperproliferative diseases and disorders related to the immune system. However, hypercalcemic effects limit their therapeutical uses and call for the development of tissue-selective new analogs. We have designed and synthesized the first examples of 1α,25-dihydroxyvitamin D3 analogs bearing an allenic unit attached to the D ring to restrict the side-chain conformational mobility. The triene system was constructed by a Pd0 -mediated cyclization/Suzuki-Miyaura cross-coupling process in the presence of an allenic side chain. The allenic moiety was built through an orthoester-Claisen rearrangement of a propargylic alcohol. The biological activity and structure of (22S)-1α,25-dihydroxy-17,20-dien-24-homo-21-nor-vitamin D3 bound to binding domain of the vitamin D receptor, provide information concerning side-chain conformational requirements for biological activity.
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Affiliation(s)
- Ramón Fraga
- Departamento de Química OrgánicaLaboratorio de Investigación Ignacio RibasUniversidad de SantiagoAvda Ciencias s/n15782Santiago de CompostelaSpain
| | - Kateryna Len
- Institut de Génétique et de BiologieMoléculaire et Cellulaire (IGBMC)67400IllkirchFrance
- Institut National de La Santé et de La Recherche Médicale (INSERM), U125867400IllkirchFrance
- Centre National de Recherche Scientifique (CNRS), UMR710467400IllkirchFrance
- Université de Strasbourg67400IllkirchFrance
| | - Regis Lutzing
- Institut de Génétique et de BiologieMoléculaire et Cellulaire (IGBMC)67400IllkirchFrance
- Institut National de La Santé et de La Recherche Médicale (INSERM), U125867400IllkirchFrance
- Centre National de Recherche Scientifique (CNRS), UMR710467400IllkirchFrance
- Université de Strasbourg67400IllkirchFrance
| | - Gilles Laverny
- Institut de Génétique et de BiologieMoléculaire et Cellulaire (IGBMC)67400IllkirchFrance
- Institut National de La Santé et de La Recherche Médicale (INSERM), U125867400IllkirchFrance
- Centre National de Recherche Scientifique (CNRS), UMR710467400IllkirchFrance
- Université de Strasbourg67400IllkirchFrance
| | - Julian Loureiro
- LAQV/REQUIMTEDepartamento de Química e BioquímicaFaculdade de Ciências da Universidade do PortoPortugal
| | - Miguel A. Maestro
- Departamento de Química OrgánicaLaboratorio de Investigación Ignacio RibasUniversidad de SantiagoAvda Ciencias s/n15782Santiago de CompostelaSpain
- Departamento de Química-CICAFacultad de CienciasUniversidad de A CoruñaCampus da Zapateira s/n15071A CoruñaSpain
| | - Natacha Rochel
- Institut de Génétique et de BiologieMoléculaire et Cellulaire (IGBMC)67400IllkirchFrance
- Institut National de La Santé et de La Recherche Médicale (INSERM), U125867400IllkirchFrance
- Centre National de Recherche Scientifique (CNRS), UMR710467400IllkirchFrance
- Université de Strasbourg67400IllkirchFrance
| | - Enrique Rodriguez‐Borges
- LAQV/REQUIMTEDepartamento de Química e BioquímicaFaculdade de Ciências da Universidade do PortoPortugal
| | - Antonio Mouriño
- Departamento de Química OrgánicaLaboratorio de Investigación Ignacio RibasUniversidad de SantiagoAvda Ciencias s/n15782Santiago de CompostelaSpain
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9
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Balaneva NN, Shestak OP, Novikov VL, Glazunov VP. Activator-free reactions of carboxylic ortho esters with cyclic β-diketones. Russ Chem Bull 2021. [DOI: 10.1007/s11172-021-3255-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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10
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Li S, Hou B, Wang J. Palladium-Catalyzed Oxidative Coupling of the Allenic C-H Bond with α-Diazo Esters: Synthesis of [3]Dendralenes. J Org Chem 2021; 86:5371-5379. [PMID: 33754719 DOI: 10.1021/acs.joc.0c03033] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A palladium-catalyzed highly regio- and stereoselective allenic C-H oxidative coupling with α-diazo esters is developed. The reaction pathway involves allylic palladium carbene as the key intermediate, which is followed by a carbene migratory insertion process. The reaction proceeds efficiently under mild conditions without external base, providing substituted [3]dendralenes bearing various functional groups.
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Affiliation(s)
- Shichao Li
- Beijing National Laboratory of Molecular Sciences (BNLMS), Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, College of Chemistry, Peking University, Beijing 100871, China
| | - Bo Hou
- Beijing National Laboratory of Molecular Sciences (BNLMS), Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, College of Chemistry, Peking University, Beijing 100871, China
| | - Jianbo Wang
- Beijing National Laboratory of Molecular Sciences (BNLMS), Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, College of Chemistry, Peking University, Beijing 100871, China
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11
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Yajima A, Shimura M, Saito T, Katsuta R, Ishigami K, Huffaker A, Schmelz EA. Synthesis and Determination of Absolute Configuration of Zealexin A1, a Sesquiterpenoid Phytoalexin from
Zea mays. European J Org Chem 2021. [DOI: 10.1002/ejoc.202001596] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Arata Yajima
- Department of Chemistry for Life Sciences and Agriculture Faculty of Life Sciences Tokyo University of Agriculture Sakuragaoka 1–1-1 Setagaya-ku 156-8502 Tokyo Japan
| | - Mikaho Shimura
- Graduate School of Agriculture Tokyo University of Agriculture Sakuragaoka 1–1-1 Setagaya-ku 156-8502 Tokyo Japan
| | - Tatsuo Saito
- Department of Chemistry for Life Sciences and Agriculture Faculty of Life Sciences Tokyo University of Agriculture Sakuragaoka 1–1-1 Setagaya-ku 156-8502 Tokyo Japan
| | - Ryo Katsuta
- Department of Chemistry for Life Sciences and Agriculture Faculty of Life Sciences Tokyo University of Agriculture Sakuragaoka 1–1-1 Setagaya-ku 156-8502 Tokyo Japan
| | - Ken Ishigami
- Department of Chemistry for Life Sciences and Agriculture Faculty of Life Sciences Tokyo University of Agriculture Sakuragaoka 1–1-1 Setagaya-ku 156-8502 Tokyo Japan
| | - Alisa Huffaker
- Section of Cell and Developmental Biology University of California San Diego 92093-0380 La Jolla California USA
| | - Eric A. Schmelz
- Section of Cell and Developmental Biology University of California San Diego 92093-0380 La Jolla California USA
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12
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Huang Y, Xue F, Liu H, Xue F, Liu XY, Song H, Qin Y. Asymmetric Total Synthesis of (+)-21-epi-Eburnamonine Via a Photocatalytic Radical Cascade Reaction. NATURAL PRODUCTS AND BIOPROSPECTING 2021; 11:99-103. [PMID: 33155164 PMCID: PMC7933312 DOI: 10.1007/s13659-020-00276-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/25/2020] [Accepted: 10/18/2020] [Indexed: 06/11/2023]
Abstract
An asymmetric total synthesis of (+)-21-epi-eburnamonine has been achieved. Key features of the synthesis include a visible-light photocatalytic intra-/intramolecular radical cascade reaction to assemble the tetracyclic ABCD ring system, and a highly diastereoselective Johnson-Claisen rearrangement to establish the C20 all-carbon quaternary stereocenter.
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Affiliation(s)
- Yuan Huang
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry and Sichuan Province, and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu, 610041, Sichuan, China
| | - Fanglin Xue
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry and Sichuan Province, and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu, 610041, Sichuan, China
| | - Hengmao Liu
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry and Sichuan Province, and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu, 610041, Sichuan, China
| | - Fei Xue
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry and Sichuan Province, and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu, 610041, Sichuan, China
| | - Xiao-Yu Liu
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry and Sichuan Province, and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu, 610041, Sichuan, China
| | - Hao Song
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry and Sichuan Province, and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu, 610041, Sichuan, China.
| | - Yong Qin
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry and Sichuan Province, and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu, 610041, Sichuan, China.
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13
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Uphade MB, Prasad KR. Total synthesis of (+)-γ-lycorane from ethyl lactate using iterative Claisen and Overman rearrangement reactions. Tetrahedron 2020. [DOI: 10.1016/j.tet.2020.131661] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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14
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Oka K, Fuchi S, Komine K, Fukuda H, Hatakeyama S, Ishihara J. Catalytic Asymmetric Total Synthesis of Exiguolide. Chemistry 2020; 26:12862-12867. [PMID: 32428309 DOI: 10.1002/chem.202001773] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2020] [Revised: 05/09/2020] [Indexed: 11/12/2022]
Abstract
The catalytic asymmetric total synthesis of (-)-exiguolide, a complex 20-membered macrolide embedded with a bis(tetrahydropyran) motif, is reported. The convergent synthesis involves the construction of the C1-C11 tetrahydropyran segment via catalytic asymmetric allylation and Prins cyclization, and the formation of the C12-C21 phosphonate segment via catalytic asymmetric cyclocondensation reaction and Johnson-Claisen rearrangement. The synthesis of 15-epi-exiguolide is also described.
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Affiliation(s)
- Kengo Oka
- Graduate School of Biomedical Sciences, Nagasaki University, Bunkyo-machi, Nagasaki, 852-8521, Japan
| | - Shunsuke Fuchi
- Graduate School of Biomedical Sciences, Nagasaki University, Bunkyo-machi, Nagasaki, 852-8521, Japan
| | - Keita Komine
- Graduate School of Biomedical Sciences, Nagasaki University, Bunkyo-machi, Nagasaki, 852-8521, Japan
| | - Hayato Fukuda
- Graduate School of Biomedical Sciences, Nagasaki University, Bunkyo-machi, Nagasaki, 852-8521, Japan
| | - Susumi Hatakeyama
- Medical Innovation Center, Nagasaki University, Bunkyo-machi, Nagasaki, 852-8521, Japan
| | - Jun Ishihara
- Graduate School of Biomedical Sciences, Nagasaki University, Bunkyo-machi, Nagasaki, 852-8521, Japan
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15
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Fernandes RA, Chaudhari DA, Jha AK. Evolution of Strategies in Paraconic Acids Synthesis. ASIAN J ORG CHEM 2020. [DOI: 10.1002/ajoc.202000353] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Rodney A. Fernandes
- Department of Chemistry Indian Institute of Technology Bombay Powai, Mumbai 400076 Maharashtra India
| | - Dipali A. Chaudhari
- Department of Chemistry Indian Institute of Technology Bombay Powai, Mumbai 400076 Maharashtra India
| | - Amit K. Jha
- Department of Chemistry Indian Institute of Technology Bombay Powai, Mumbai 400076 Maharashtra India
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16
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Khademi Z, Nikoofar K. Applications of alkyl orthoesters as valuable substrates in organic transformations, focusing on reaction media. RSC Adv 2020; 10:30314-30397. [PMID: 35559005 PMCID: PMC9092620 DOI: 10.1039/d0ra05276k] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2020] [Accepted: 07/27/2020] [Indexed: 02/01/2023] Open
Abstract
In this review we focus on applications of alkyl orthoesters as valuable and efficient substrates to perform various classes of two-component and multi-component organic reactions. The article has classified them according to two aspects, which are: (i) a focus on the reaction medium (solvent-free conditions, aqueous media, and organic solvents); and (ii) an examination of product structures. Reaction accomplishment under solvent-free conditions is an eco-friendly process with the absence of volatile toxic solvents, which puts it in line with green chemistry goals. Water is an interesting choice in organic transformations due to its inexpensiveness and safety. The authors hope their assessment will help chemists to attain new approaches for utilizing alkyl orthoesters in various organic synthetic methods. The review covers the corresponding literature up to the beginning of 2020.
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Affiliation(s)
- Zahra Khademi
- Department of Chemistry, Faculty of Physics & Chemistry, Alzahra University P.O. Box 1993891176 Tehran Iran +982188041344 +982188041344
| | - Kobra Nikoofar
- Department of Chemistry, Faculty of Physics & Chemistry, Alzahra University P.O. Box 1993891176 Tehran Iran +982188041344 +982188041344
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17
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Affiliation(s)
- Zohreh Nazarian
- Faculty of Chemistry and Petroleum SciencesShahid Beheshti University, District 1 Daneshjou Boulevard 1983969411 Tehran Tehran Province Iran P.O. Box: 1983963113
| | - Minoo Dabiri
- Faculty of Chemistry and Petroleum SciencesShahid Beheshti University, District 1 Daneshjou Boulevard 1983969411 Tehran Tehran Province Iran P.O. Box: 1983963113
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18
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Fu S, Liu B. Recent progress in the synthesis of limonoids and limonoid-like natural products. Org Chem Front 2020. [DOI: 10.1039/d0qo00203h] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Recent progress in syntheses of limonoids and limonoid-like natural products is reviewed. The current “state-of-art” advance on novel synthetic strategy are summarized and future outlook will be presented.
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Affiliation(s)
- Shaomin Fu
- Key Laboratory of Green Chemistry &Technology of the Ministry of Education
- College of Chemistry
- Sichuan University
- Chengdu
- China
| | - Bo Liu
- Key Laboratory of Green Chemistry &Technology of the Ministry of Education
- College of Chemistry
- Sichuan University
- Chengdu
- China
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19
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Egami H, Hamashima Y. Practical and Scalable Organic Reactions with Flow Microwave Apparatus. CHEM REC 2018; 19:157-171. [PMID: 30511806 DOI: 10.1002/tcr.201800132] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2018] [Accepted: 10/12/2018] [Indexed: 01/01/2023]
Abstract
Microwave irradiation has been used for accelerating organic reactions as a heating method and has been proven to be useful in laboratory scale organic synthesis. The major drawback of microwave chemistry is the difficulty in scaling up, mainly because of the low penetration depth of microwaves. The combination of microwave chemistry and flow chemistry is considered to overcome the problem in scaling up of microwave-assisted organic reactions, and some flow microwave systems have been developed in both academic and industrial communities. In this context, we have demonstrated the scale-up of fundamental organic reactions using a novel flow microwave system developed by the academic-industrial alliance between the University of Shizuoka, Advanced Industrial Science and Technology, and SAIDA FDS. In this Personal Account, we summarize the recent progress of our scalable microwave-assisted continuous synthesis using the SAIDA flow microwave apparatus.
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Affiliation(s)
- Hiromichi Egami
- School of Pharmaceutical Sciences, University of Shizuoka 52-1 Yada, Suruga-ku, Shizuoka, Japan
| | - Yoshitaka Hamashima
- School of Pharmaceutical Sciences, University of Shizuoka 52-1 Yada, Suruga-ku, Shizuoka, Japan
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20
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Egami H, Tamaoki S, Abe M, Ohneda N, Yoshimura T, Okamoto T, Odajima H, Mase N, Takeda K, Hamashima Y. Scalable Microwave-Assisted Johnson–Claisen Rearrangement with a Continuous Flow Microwave System. Org Process Res Dev 2018. [DOI: 10.1021/acs.oprd.8b00185] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Hiromichi Egami
- School of Pharmaceutical Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka, Shizuoka 422-8526, Japan
| | - Souma Tamaoki
- School of Pharmaceutical Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka, Shizuoka 422-8526, Japan
| | - Masato Abe
- Applied Chemistry and Biochemical Engineering Course, Department of Engineering, Graduate School of Integrated Science and Technology, Shizuoka University, 3-5-1 Johoku, Hamamatsu, Shizuoka 432-8561, Japan
| | - Noriyuki Ohneda
- SAIDA FDS Inc., 143-10 Isshiki, Yaizu, Shizuoka 425-0054, Japan
| | - Takeo Yoshimura
- SAIDA FDS Inc., 143-10 Isshiki, Yaizu, Shizuoka 425-0054, Japan
| | - Tadashi Okamoto
- SAIDA FDS Inc., 143-10 Isshiki, Yaizu, Shizuoka 425-0054, Japan
| | | | - Nobuyuki Mase
- Applied Chemistry and Biochemical Engineering Course, Department of Engineering, Graduate School of Integrated Science and Technology, Shizuoka University, 3-5-1 Johoku, Hamamatsu, Shizuoka 432-8561, Japan
| | - Kazuhiro Takeda
- Applied Chemistry and Biochemical Engineering Course, Department of Engineering, Graduate School of Integrated Science and Technology, Shizuoka University, 3-5-1 Johoku, Hamamatsu, Shizuoka 432-8561, Japan
| | - Yoshitaka Hamashima
- School of Pharmaceutical Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka, Shizuoka 422-8526, Japan
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21
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Kotha S, Meshram M. Application of Claisen Rearrangement and Olefin Metathesis in Organic Synthesis. Chem Asian J 2018; 13:1758-1766. [PMID: 29956880 DOI: 10.1002/asia.201800613] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2018] [Revised: 05/17/2018] [Indexed: 11/07/2022]
Abstract
Several new synthetic methods to diverse polycycles and heterocycles on the basis of [3,3]-sigmatropic rearrangement and ring-closing metathesis as key steps are summarized. In this regard, Claisen, aza-Claisen, and Overman rearrangements are used in combination with other popular reactions such as ring-closing metathesis, Suzuki coupling, Diels-Alder reaction, and retro-Diels-Alder reaction. To this end, we prepared polycycles (e.g., cyclophanes, cage molecules), heterocycles (e.g., oxepins, azapins), carbocycles, and spirocycles with the use of the above protocol.
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Affiliation(s)
- Sambasivarao Kotha
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai-, 400 076, India
| | - Milind Meshram
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai-, 400 076, India
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22
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Maryasin B, Kaldre D, Galaverna R, Klose I, Ruider S, Drescher M, Kählig H, González L, Eberlin MN, Jurberg ID, Maulide N. Unusual mechanisms in Claisen rearrangements: an ionic fragmentation leading to a meta-selective rearrangement. Chem Sci 2018; 9:4124-4131. [PMID: 29780542 PMCID: PMC5941282 DOI: 10.1039/c7sc04736c] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2017] [Accepted: 03/24/2018] [Indexed: 12/13/2022] Open
Abstract
A mechanistic investigation of the acid-catalysed redox-neutral oxoarylation reaction of ynamides using electrospray ionisation mass-spectrometry (ESI-MS) and quantum chemical calculations (DFT and MP2) is presented. This study reveals the diversity of pathways and products available from an otherwise deceptively simple-looking, classical transformation: fragmentation, an unusual meta-arylation and competing α-carbonyl cation pathways are some of the alternatives unveiled by ESI-MS and mechanistic experiments. Detailed calculations explain the observed trends and rationalise the results.
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Affiliation(s)
- Boris Maryasin
- University of Vienna , Faculty of Chemistry , Institute of Organic Chemistry , Währinger Strasse 38 , 1090 Vienna , Austria . ; .,University of Vienna , Faculty of Chemistry , Institute of Theoretical Chemistry , Währinger Strasse 17 , 1090 Vienna , Austria
| | - Dainis Kaldre
- University of Vienna , Faculty of Chemistry , Institute of Organic Chemistry , Währinger Strasse 38 , 1090 Vienna , Austria . ;
| | - Renan Galaverna
- State University of Campinas , ThoMSon Mass Spectrometry Laboratory , Institute of Chemistry , Rua Monteiro Lobato 270 , 13083-970 , Campinas , Brazil
| | - Immo Klose
- University of Vienna , Faculty of Chemistry , Institute of Organic Chemistry , Währinger Strasse 38 , 1090 Vienna , Austria . ;
| | - Stefan Ruider
- University of Vienna , Faculty of Chemistry , Institute of Organic Chemistry , Währinger Strasse 38 , 1090 Vienna , Austria . ; .,University of Vienna , Faculty of Chemistry , Institute of Theoretical Chemistry , Währinger Strasse 17 , 1090 Vienna , Austria
| | - Martina Drescher
- University of Vienna , Faculty of Chemistry , Institute of Organic Chemistry , Währinger Strasse 38 , 1090 Vienna , Austria . ;
| | - Hanspeter Kählig
- University of Vienna , Faculty of Chemistry , Institute of Organic Chemistry , Währinger Strasse 38 , 1090 Vienna , Austria . ;
| | - Leticia González
- University of Vienna , Faculty of Chemistry , Institute of Theoretical Chemistry , Währinger Strasse 17 , 1090 Vienna , Austria
| | - Marcos N Eberlin
- State University of Campinas , ThoMSon Mass Spectrometry Laboratory , Institute of Chemistry , Rua Monteiro Lobato 270 , 13083-970 , Campinas , Brazil
| | - Igor D Jurberg
- State University of Campinas , Institute of Chemistry , Rua Monteiro Lobato 270 , 13083-970 , Campinas , Brazil .
| | - Nuno Maulide
- University of Vienna , Faculty of Chemistry , Institute of Organic Chemistry , Währinger Strasse 38 , 1090 Vienna , Austria . ;
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23
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Brill ZG, Condakes ML, Ting CP, Maimone TJ. Navigating the Chiral Pool in the Total Synthesis of Complex Terpene Natural Products. Chem Rev 2017; 117:11753-11795. [PMID: 28293944 PMCID: PMC5638449 DOI: 10.1021/acs.chemrev.6b00834] [Citation(s) in RCA: 186] [Impact Index Per Article: 26.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
The pool of abundant chiral terpene building blocks (i.e., "chiral pool terpenes") has long served as a starting point for the chemical synthesis of complex natural products, including many terpenes themselves. As inexpensive and versatile starting materials, such compounds continue to influence modern synthetic chemistry. This review highlights 21st century terpene total syntheses which themselves use small, terpene-derived materials as building blocks. An outlook to the future of research in this area is highlighted as well.
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Affiliation(s)
- Zachary G. Brill
- Department of Chemistry, University of California, Berkeley, Berkeley, CA 94720
| | - Matthew L. Condakes
- Department of Chemistry, University of California, Berkeley, Berkeley, CA 94720
| | - Chi P. Ting
- Department of Chemistry, University of California, Berkeley, Berkeley, CA 94720
| | - Thomas J. Maimone
- Department of Chemistry, University of California, Berkeley, Berkeley, CA 94720
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24
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Fernandes RA, Kattanguru P, Gholap SP, Chaudhari DA. Recent advances in the Overman rearrangement: synthesis of natural products and valuable compounds. Org Biomol Chem 2017; 15:2672-2710. [DOI: 10.1039/c6ob02625g] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
This review documents the reports since 2005 on the Overman rearrangement, an important C–N bond forming reaction that has been profoundly used in the synthesis of natural products, synthetic intermediates, building blocks and valuable compounds.
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Affiliation(s)
- Rodney A. Fernandes
- Department of Chemistry
- Indian Institute of Technology Bombay
- Mumbai 400076
- India
| | - Pullaiah Kattanguru
- Department of Chemistry
- Indian Institute of Technology Bombay
- Mumbai 400076
- India
| | - Sachin P. Gholap
- Department of Chemistry
- Indian Institute of Technology Bombay
- Mumbai 400076
- India
| | - Dipali A. Chaudhari
- Department of Chemistry
- Indian Institute of Technology Bombay
- Mumbai 400076
- India
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25
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Sakai Y, Asakura Y, Morita M, Takahashi T. Concise Synthesis of Hydroxy β-Methyl Fatty Acid Ethyl Esters. Chem Pharm Bull (Tokyo) 2017; 65:1195-1198. [DOI: 10.1248/cpb.c17-00637] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- Yuki Sakai
- Department of Pharmaceutical Science, Yokohama University of Pharmacy
| | - Yukiko Asakura
- Department of Pharmaceutical Science, Yokohama University of Pharmacy
| | - Mitsuhiro Morita
- Department of Biology, Kobe University Graduate School of Science
| | - Takashi Takahashi
- Department of Pharmaceutical Science, Yokohama University of Pharmacy
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26
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Volpin G, Vepřek NA, Bellan AB, Trauner D. Enantioselektive Synthese und Racemisierung von (−)‐Sinoracutin. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201608206] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Giulio Volpin
- Department of Chemistry Ludwig-Maximilians-Universität München 81377 München Deutschland
| | - Nynke A. Vepřek
- Department of Chemistry Ludwig-Maximilians-Universität München 81377 München Deutschland
| | - Andreas B. Bellan
- Department of Chemistry Ludwig-Maximilians-Universität München 81377 München Deutschland
| | - Dirk Trauner
- Department of Chemistry Ludwig-Maximilians-Universität München 81377 München Deutschland
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27
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Volpin G, Vepřek NA, Bellan AB, Trauner D. Enantioselective Synthesis and Racemization of (-)-Sinoracutine. Angew Chem Int Ed Engl 2016; 56:897-901. [PMID: 27990734 DOI: 10.1002/anie.201608206] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2016] [Indexed: 11/12/2022]
Abstract
Sinoracutine is a recently isolated alkaloid with unusual stereochemical and biological properties. It features an unprecedented tetracyclic 6/6/5/5 skeleton that bears an N-methylpyrrolidine ring fused to a cyclopentenone. Interestingly, both enantiomers of sinoracutine have been independently isolated from the same plant, yet the molecule does not appear to occur as a racemate. Here, we present a short synthesis of (-)-sinoracutine that relies on a highly diastereoselective Pauson-Khand reaction and a Mandai-Claisen reaction to install the quaternary stereocenter. Our work establishes the absolute configuration of the levorotatory isomer and suggests that the optical purity of sinoracutine varies in nature due to its gradual racemization. Experimental evidence supports this proposal, and a plausible mechanism for the racemization is provided.
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Affiliation(s)
- Giulio Volpin
- Department of Chemistry, Ludwig-Maximilians-Universität München, 81377, Munich, Germany
| | - Nynke A Vepřek
- Department of Chemistry, Ludwig-Maximilians-Universität München, 81377, Munich, Germany
| | - Andreas B Bellan
- Department of Chemistry, Ludwig-Maximilians-Universität München, 81377, Munich, Germany
| | - Dirk Trauner
- Department of Chemistry, Ludwig-Maximilians-Universität München, 81377, Munich, Germany
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28
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Mizoguchi H, Micalizio GC. Synthesis of Angularly Substituted trans-Fused Decalins through a Metallacycle-Mediated Annulative Cross-Coupling Cascade. Angew Chem Int Ed Engl 2016; 55:13099-13103. [PMID: 27634059 PMCID: PMC5056368 DOI: 10.1002/anie.201606962] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2016] [Indexed: 01/07/2023]
Abstract
A convergent coupling reaction is described that enables the stereoselective construction of angularly substituted trans-fused decalins from acyclic precursors. The process builds on our alkoxide-directed titanium-mediated alkyne-alkyne coupling and employs a 1,7-enyne coupling partner. Overall, the reaction is thought to proceed through initial formation of a tetrasusbstituted metallacyclopentadiene, stereoselective intramolecular [4+2] cycloaddition, elimination, isomerization, and regio- and stereoselective protonation. Distinct from our early studies directed at the synthesis of trans-fused hydrindanes, the current annulative coupling reveals an important effect of TMSCl in controlling the final protonation-the event that establishes the stereochemistry of the ring fusion.
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Affiliation(s)
- Haruki Mizoguchi
- Department of Chemistry, Dartmouth College, 6128 Burke Laboratory, Hanover, NH, 03755, USA
| | - Glenn C Micalizio
- Department of Chemistry, Dartmouth College, 6128 Burke Laboratory, Hanover, NH, 03755, USA.
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29
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Mizoguchi H, Micalizio GC. Synthesis of Angularly Substituted trans
-Fused Decalins through a Metallacycle-Mediated Annulative Cross-Coupling Cascade. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201606962] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Haruki Mizoguchi
- Department of Chemistry; Dartmouth College; 6128 Burke Laboratory Hanover NH 03755 USA
| | - Glenn C. Micalizio
- Department of Chemistry; Dartmouth College; 6128 Burke Laboratory Hanover NH 03755 USA
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30
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Kryshtal GV, Zhdankina GM, Ignat’ev NV, Schulte M, Zlotin SG. The orthoester Johnson–Claisen rearrangement of allylic terpenols in the presence of acidic ionic liquid. J Fluor Chem 2016. [DOI: 10.1016/j.jfluchem.2016.01.005] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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31
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Seidensticker T, Möller D, Vorholt AJ. Merger of Johnson–Claisen rearrangement and alkoxycarbonylation for atom efficient diester synthesis. Tetrahedron Lett 2016. [DOI: 10.1016/j.tetlet.2015.12.032] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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32
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Muthusamy G, Pansare SV. Modular synthesis of allyl vinyl ethers for the enantioselective construction of functionalized quaternary stereocenters. RSC Adv 2016. [DOI: 10.1039/c6ra24284g] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
A flexible synthesis of allyl vinyl ethers, precursors of functionalized quaternary stereocenters, was developed by employing a regioselective Petasis olefination of haloallyl oxalates and subsequent cross-coupling with alkyl- and aryl boronic acids.
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Affiliation(s)
| | - Sunil V. Pansare
- Department of Chemistry
- Memorial University
- St. John's
- Canada A1B3X7
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33
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Lawrence BM, Crews DK. On the origins of regioselectivity in the orthoester Claisen rearrangement of bisallylic alcohols. Tetrahedron Lett 2015. [DOI: 10.1016/j.tetlet.2014.11.102] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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34
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Li J, Yang P, Yao M, Deng J, Li A. Total Synthesis of Rubriflordilactone A. J Am Chem Soc 2014; 136:16477-80. [DOI: 10.1021/ja5092563] [Citation(s) in RCA: 135] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Jian Li
- State Key Laboratory of Bioorganic
and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
| | - Peng Yang
- State Key Laboratory of Bioorganic
and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
| | - Ming Yao
- State Key Laboratory of Bioorganic
and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
| | - Jun Deng
- State Key Laboratory of Bioorganic
and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
| | - Ang Li
- State Key Laboratory of Bioorganic
and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
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35
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Zhu L, Liu Y, Ma R, Tong R. Total Synthesis and Structural Revision of (+)-Uprolide G Acetate. Angew Chem Int Ed Engl 2014; 54:627-32. [DOI: 10.1002/anie.201409618] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2014] [Indexed: 11/10/2022]
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36
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Zhu L, Liu Y, Ma R, Tong R. Total Synthesis and Structural Revision of (+)-Uprolide G Acetate. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201409618] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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37
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Ren J, Liu Y, Song L, Tong R. Scalable Asymmetric Total Syntheses of (+)-Psoracorylifol B and (+)-ent-Psoracorylifol C. Org Lett 2014; 16:2986-9. [DOI: 10.1021/ol501120m] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Jingyun Ren
- Department
of Chemistry, The Hong Kong University of Science and Technology, Clearwater Bay, Kowloon, Hong Kong, China
| | - Yuan Liu
- Department
of Chemistry, The Hong Kong University of Science and Technology, Clearwater Bay, Kowloon, Hong Kong, China
| | - Liyan Song
- Department
of Chemistry, The Hong Kong University of Science and Technology, Clearwater Bay, Kowloon, Hong Kong, China
| | - Rongbiao Tong
- Department
of Chemistry, The Hong Kong University of Science and Technology, Clearwater Bay, Kowloon, Hong Kong, China
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