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Yan X, Zhang Q, Zheng J, Li WDZ. Reductive Oxy-Nazarov Cyclization toward Expedient Construction of a Cyclopenta[1,2- b]pyrrolo[1,2- a]azepine Ring System: Formal Total Syntheses of Stemonamine and Cephalotaxine. J Org Chem 2024; 89:5164-5169. [PMID: 38536410 DOI: 10.1021/acs.joc.4c00035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/06/2024]
Abstract
Formal total syntheses of stemonamine and cephalotaxine bearing the core cyclopenta[1,2-b]pyrrolo[1,2-a]azepine ring skeleton were achieved. The general synthetic strategy in the synthesis features the reductive oxy-Nazarov cyclization as key step, leading to the versatile construction of N-substituted spiro quaternary stereogenic centers from readily available starting materials.
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Affiliation(s)
- Xifei Yan
- School of Chemistry, Key Laboratory of Advanced Technologies of Material, Minister of Education, School of Life Science and Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, P. R. China
| | - Qin Zhang
- School of Chemistry, Key Laboratory of Advanced Technologies of Material, Minister of Education, School of Life Science and Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, P. R. China
| | - Jianfeng Zheng
- School of Chemistry, Key Laboratory of Advanced Technologies of Material, Minister of Education, School of Life Science and Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, P. R. China
| | - Wei-Dong Z Li
- School of Chemistry, Key Laboratory of Advanced Technologies of Material, Minister of Education, School of Life Science and Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, P. R. China
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2
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Ni C, Liang Z, Xu X, Yu F, Zhang D, Chen C. Phosphine-Catalyzed [4 + 3] Annulation of β'-Acetoxy Allenoates with 1C,3N-Dinucleophiles: Access to Functionalized Azepine Derivatives. J Org Chem 2024; 89:4784-4791. [PMID: 38523355 DOI: 10.1021/acs.joc.4c00011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/26/2024]
Abstract
A novel method for the synthesis of functionalized azepine derivatives has been developed through a phosphine-catalyzed [4 + 3] annulation of β'-acetoxy allenoates with benzimidazole-derived 1C,3N-dinucleophiles. This approach demonstrates high efficiency and yields ranging from moderate to excellent. The reaction exhibits a wide substrate scope under the optimized conditions. Furthermore, an initial exploration of the asymmetric variant of this reaction has been conducted, utilizing phosphine (R)-SITCP as the catalyst.
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Affiliation(s)
- Chunjie Ni
- School of Pharmacy, Yancheng Teachers University, Yancheng 224007, China
| | - Zhanhang Liang
- School of Pharmacy, Yancheng Teachers University, Yancheng 224007, China
- College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, Nanjing 211816, China
| | - Xiaojuan Xu
- School of Pharmacy, Yancheng Teachers University, Yancheng 224007, China
- College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, Nanjing 211816, China
| | - Fan Yu
- School of Pharmacy, Yancheng Teachers University, Yancheng 224007, China
| | - Dong Zhang
- School of Pharmacy, Yancheng Teachers University, Yancheng 224007, China
| | - Chen Chen
- College of Chemistry, Tianjin Normal University, Tianjin 300387, China
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3
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Jeon H, Kim JH, Kim S. Recent asymmetric synthesis of natural products bearing an α-tertiary amine moiety via temporary chirality induction strategies. Nat Prod Rep 2024; 41:228-250. [PMID: 37846620 DOI: 10.1039/d3np00032j] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2023]
Abstract
Covering: 2013 to 2023The α-tertiary amine moiety is a common structural motif in natural alkaloids and is frequently associated with intriguing biological activities and inherent synthetic challenges. A major hurdle in the total synthesis of these alkaloids is the asymmetric construction of the α-tertiary amine moiety. Temporary chirality inductions have been effective strategies employed to address this issue, particularly in natural product synthesis. The temporary chirality induction strategies in α-tertiary amine synthesis can be broadly classified into three categories based on the types of temporary chirality involved: Seebach's self-regeneration of stereocenters (SRS), C-to-N-to-C chirality transfer, and memory of chirality (MOC). This review highlights the recent advancements in temporary chirality induction strategies for the total synthesis of α-tertiary amine-containing natural products between 2013 and 2023.
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Affiliation(s)
- Hongjun Jeon
- Therapeutics & Biotechnology Division, Korea Research Institute of Chemical Technology (KRICT), Daejeon 34114, Republic of Korea
| | - Jae Hyun Kim
- College of Pharmacy, Chung-Ang University, Seoul 06974, Republic of Korea
| | - Sanghee Kim
- College of Pharmacy, Seoul National University, Seoul 08826, Republic of Korea.
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4
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Uwabe Y, Muto K, Yamaguchi J. Concise Synthesis of (±)-Fortuneicyclidins and (±)-Cephalotine B Enabled by Pd-Catalyzed Dearomative Spirocyclization. Chemistry 2023; 29:e202302769. [PMID: 37703132 DOI: 10.1002/chem.202302769] [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: 08/23/2023] [Revised: 09/13/2023] [Accepted: 09/13/2023] [Indexed: 09/15/2023]
Abstract
Total syntheses of C11-oxygenated Cephalotaxus alkaloids, fortuneicyclidins A and B, and cephalotine B, were achieved. The key for the synthesis is a Pd-catalyzed dearomative spirocyclization of bromofurans with N-tosylhydrazones, followed by acid-mediated tandem transformation to construct the tetracyclic skeleton with the C11-oxygen functional group. Chemo-selective and catalytic functional group conversions of the tetracyclic intermediate completed the synthesis of fortuneicyclidins and cephalotine B in 8 and 9 steps, respectively.
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Affiliation(s)
- Yota Uwabe
- Department of Applied Chemistry, Waseda University, 513 Wasedatsurumakicho, Shinjuku, Tokyo, 162-0041, Japan
| | - Kei Muto
- Waseda Institute for Advanced Study, Waseda University, 513 Wasedatsurumakicho, Shinjuku, Tokyo, 162-0041, Japan
| | - Junichiro Yamaguchi
- Department of Applied Chemistry, Waseda University, 513 Wasedatsurumakicho, Shinjuku, Tokyo, 162-0041, Japan
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Zhuang QB, Tian JR, Lu K, Zhang XM, Zhang FM, Tu YQ, Fan R, Li ZH, Zhang YD. Catalytic Asymmetric Polycyclization of Tertiary Enamides with Silyl Enol Ethers: Total Synthesis of (-)-Cephalocyclidin A. J Am Chem Soc 2023. [PMID: 38019148 DOI: 10.1021/jacs.3c11178] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2023]
Abstract
A catalytic enantioselective polycyclization of tertiary enamides with terminal silyl enol ethers has been developed by virtue of Cu(OTf)2 catalysis with a novel spiropyrroline-derived oxazole (SPDO) ligand. This tandem reaction offers an effective approach to assemble bicyclic and tricyclic N-heterocycles bearing both aza- and oxa-quaternary stereogenic centers, which are primal subunits in a range of natural alkaloids. Strategic application of this methodology and a late-stage radical cyclization as key steps have been showcased in the concise total synthesis of (-)-cephalocyclidin A.
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Affiliation(s)
- Qing-Bo Zhuang
- State Key Laboratory of Applied Organic Chemistry & College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
| | - Jin-Rui Tian
- State Key Laboratory of Applied Organic Chemistry & College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
| | - Ka Lu
- State Key Laboratory of Applied Organic Chemistry & College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
| | - Xiao-Ming Zhang
- State Key Laboratory of Applied Organic Chemistry & College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
| | - Fu-Min Zhang
- State Key Laboratory of Applied Organic Chemistry & College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
| | - Yong-Qiang Tu
- State Key Laboratory of Applied Organic Chemistry & College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
- School of Chemistry and Chemical Engineering, Frontier Scientific Center of Transformative Molecules, Shanghai Key Laboratory of Chiral Drugs and Engineering, Shanghai Jiao Tong University, Shanghai Minhang 200240, China
| | - Rong Fan
- State Key Laboratory of Applied Organic Chemistry & College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
| | - Zhi-Hao Li
- State Key Laboratory of Applied Organic Chemistry & College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
| | - Yu-Dong Zhang
- State Key Laboratory of Applied Organic Chemistry & College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
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Sheng PZ, Ni ZB, Li LL, Wei K, Zhang H, Yang YR. Enantioselective Total Syntheses of the Cephalotaxus Alkaloids (-)-Fortuneicyclidins A and B and (-)-Cephalotine B. Org Lett 2023; 25:7464-7469. [PMID: 37800465 DOI: 10.1021/acs.orglett.3c02739] [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: 10/07/2023]
Abstract
Fortuneicyclidins A and B are a pair of recently isolated Cephalotaxus alkaloids with an unprecedented rearranged polycyclic skeleton possessing multiple complex stereocenters and functionalization. In this work, highly stereocontrolled asymmetric total syntheses for title alkaloids were outlined. Key features include an underexplored Ir-catalyzed α-allylation of aldehyde to strategically install a vicinal N-substituted quaternary center and a tertiary stereocenter, Heck and RCM reactions to construct the critical polycyclic framework rapidly, two different tandem oxidation-transannular aldol cyclization processes, one through ozonolysis and another via Swern oxidation, to forge the last ring for fortuneicyclidins A and B, respectively. In this approach, the challenging C-2 hydroxyl group can be installed stereospecifically.
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Affiliation(s)
- Peng-Zhen Sheng
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Zhi-Bin Ni
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Lu-Lu Li
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China
| | - Kun Wei
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China
| | - Hongbin Zhang
- Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, Yunnan University, Kunming 650091, China
| | - Yu-Rong Yang
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China
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7
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Sheng PZ, Li LL, Ni ZB, Wei K, Yang YR. Enantioselective Total Synthesis of the Cephalotaxus Alkaloid (-)-Cephalotine A. Org Lett 2023; 25:7459-7463. [PMID: 37578250 DOI: 10.1021/acs.orglett.3c02097] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/15/2023]
Abstract
Cephalotine A, a recently isolated Cephalotaxus alkaloid, was first synthesized enantioselectively through three critical reactions. SmI2 -mediated radical cyclization of lactone and aldehyde to forge the final ring system, Chang's iridium-catalyzed C-H amidation to construct pyrrolidone stereoselectively, and Carreria's dual Ir/amine catalyzed allylation to install the vicinal tertiary stereocenters.
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Affiliation(s)
- Peng-Zhen Sheng
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Lu-Lu Li
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China
| | - Zhi-Bin Ni
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Kun Wei
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China
| | - Yu-Rong Yang
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China
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Renault J, Bouvry C, Cupif JF, Hurvois JP. Alkylation of N, N-Dibenzylaminoacetonitrile: From Five- to Seven-Membered Nitrogen-Containing Heterocyclic Systems. J Org Chem 2023; 88:3582-3598. [PMID: 36848662 DOI: 10.1021/acs.joc.2c02795] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/01/2023]
Abstract
The syntheses of several alkaloids and nitrogen-containing compounds including N-Boc-coniine (14b), pyrrolizidine (1), δ-coniceine (2), and pyrrolo[1,2a]azepine (3) are described. New C-C bonds in the α position relative to the nitrogen atom were formed by the alkylation of metalated α-aminonitriles 4 and 6a-c with alkyl iodides possessing the requisite size and functionality. In all of the reported cases, the pyrrolidine ring was formed in the aqueous medium through a favorable 5-exo-tet process involving a primary or a secondary amino group and a terminal δ-leaving group. Conversely, the azepane ring was efficiently formed in N,N-dimethylformamide (DMF), as the preferred aprotic solvent, through an unreported 7-exo-tet cyclization process involving a more nucleophilic sodium amide and a terminal mesylate borne by a saturated six carbon chain unit. In this way, we successfully synthesized pyrrolo[1,2a]azepane 3 and 2-propyl-azepane 14c in good yields from inexpensive and readily available materials without tedious separation methods.
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Affiliation(s)
- Jacques Renault
- Univ Rennes, CNRS, ISCR (Institut des Sciences Chimiques Rennes), UMR 6226, F-35000 Rennes, France
| | - Christelle Bouvry
- Comprehensive Cancer Center Eugène Marquis, Avenue de la Bataille Flandre-Dunkerque, 35000 Rennes, France
| | - Jean-François Cupif
- Univ Rennes, CNRS, ISCR (Institut des Sciences Chimiques Rennes), UMR 6226, F-35000 Rennes, France
| | - Jean-Pierre Hurvois
- Univ Rennes, CNRS, ISCR (Institut des Sciences Chimiques Rennes), UMR 6226, F-35000 Rennes, France
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9
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Progress in organocatalytic asymmetric (4+3) cycloadditions for the enantioselective construction of seven-membered rings. Sci China Chem 2023. [DOI: 10.1007/s11426-022-1471-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/25/2023]
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10
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Saito K, Aoyama H, Sako M, Arisawa M, Murai K. Double Ring Expansion Strategy for Fused 3-Benzazepines: Alternative Synthesis of the Dolby-Weinreb Enamine. J Org Chem 2022; 87:16947-16951. [PMID: 36475678 DOI: 10.1021/acs.joc.2c02475] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
A double ring expansion strategy for constructing fused 3-benzazepines is described. The oxidative ring expansion of spiroamine compounds with N-chlorosuccinimide and subsequent ring expansion of the resulting ketiminium ion intermediates with trimethylsilyldiazomethane afforded fused 3-benzazepines in a one-pot operation. Importantly, the Dolby-Weinreb enamine, which is a key synthetic intermediate for harringtonine alkaloids, cephalotaxines, can be accessed from commercial materials in only two steps using our developed method.
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Affiliation(s)
- Keigo Saito
- Graduate School of Pharmaceutical Sciences, Osaka University, Suita, Osaka 565-0871, Japan
| | - Hiroshi Aoyama
- Graduate School of Pharmaceutical Sciences, Osaka University, Suita, Osaka 565-0871, Japan
| | - Makoto Sako
- Graduate School of Pharmaceutical Sciences, Osaka University, Suita, Osaka 565-0871, Japan
| | - Mitsuhiro Arisawa
- Graduate School of Pharmaceutical Sciences, Osaka University, Suita, Osaka 565-0871, Japan
| | - Kenichi Murai
- Graduate School of Pharmaceutical Sciences, Osaka University, Suita, Osaka 565-0871, Japan
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Huang J, Chen Y, Zhao H, Pan H, Yao Y. Recent Advances in the Total Synthesis of Cephalotane-Type Norditerpenoids from Cephalotaxus sinensis. SYNTHESIS-STUTTGART 2022. [DOI: 10.1055/a-1828-2170] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Abstract
Cephalotaxus diterpenoids are well known for their unique structures and biological activities. Cephanolides, as new cephalotane-type norditerpenoids isolated from Cephalotaxus sinensis, have attracted considerable attention from the synthetic community. The present Short Review summarizes strategic approaches toward the total synthesis of cephanolides from 2018 to 2021.1 Introduction2 Synthetic Approaches toward Cephalotane-Type Norditerpenoids2.1 First Total Synthesis of Cephanolides B and C by Zhao (2018)2.2 Total Synthesis of Cephanolides A–D by Sarpong (2021)2.3 Total Synthesis of Cephanolide B by Yang (2021)2.4 Asymmetric Total Synthesis of Cephanolide A by Gao (2020)2.5 Asymmetric Total Synthesis of Cephanolide B by Gao (2021)2.6 Asymmetric Total Synthesis of Cephanolides A and B by Cai (2021)3 Conclusion and Perspectives
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Affiliation(s)
- Jian Huang
- State Key Laboratory Breeding Base of Green Pesticide and Agricultural Bioengineering, Key Laboratory of Green Pesticide and Agriculture Bioengineering, Ministry of Education, Center for Research and Development of Fine Chemicals, Guizhou University
| | - Yang Chen
- State Key Laboratory Breeding Base of Green Pesticide and Agricultural Bioengineering, Key Laboratory of Green Pesticide and Agriculture Bioengineering, Ministry of Education, Center for Research and Development of Fine Chemicals, Guizhou University
| | - Hongyi Zhao
- State Key Laboratory Breeding Base of Green Pesticide and Agricultural Bioengineering, Key Laboratory of Green Pesticide and Agriculture Bioengineering, Ministry of Education, Center for Research and Development of Fine Chemicals, Guizhou University
| | - Huanhuan Pan
- State Key Laboratory Breeding Base of Green Pesticide and Agricultural Bioengineering, Key Laboratory of Green Pesticide and Agriculture Bioengineering, Ministry of Education, Center for Research and Development of Fine Chemicals, Guizhou University
| | - Yi Yao
- Guizhou Engineering Laboratory for Synthetic Drugs, School of Pharmaceutical Sciences, Guizhou University
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