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Zhang Q, Zhang J, Qian H, Ma S. Aerobic Oxidation of PMB Ethers to Carboxylic Acids. Chemistry 2024; 30:e202401815. [PMID: 38925594 DOI: 10.1002/chem.202401815] [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: 05/09/2024] [Revised: 06/20/2024] [Accepted: 06/24/2024] [Indexed: 06/28/2024]
Abstract
The first aerobic protocol of direct transformation of p-methoxybenzyl (PMB) ethers to carboxylic acids efficiently with Fe(NO3)3 ⋅ 9H2O and TEMPO as catalysts at room temperature has been developed. The reaction accommodates C-Br bond, terminal/non-terminal C-C triple bond, amide, cyano, nitro, ester, and trifluoromethyl groups. Even highly selective oxidative deprotection of different benzylic PMB ethers has been realized. The reaction has been successfully applied to the total synthesis of natural product, (R)-6-hydroxy-7,9-octadecadiynoic acid, demonstrating the practicality of the method. Based on experimental studies, a possible mechanism involving oxygen-stabilized benzylic cation has been proposed.
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Affiliation(s)
- Qian Zhang
- Research Center for Molecular Recognition and Synthesis, Department of Chemistry, Fudan University, 220 Handan Lu, Shanghai, 200433, China
| | - Jiabin Zhang
- Laboratory of Molecular Recognition and Synthesis, Department of Chemistry, Zhejiang University, Hangzhou, 310027, Zhejiang Province, China
| | - Hui Qian
- Research Center for Molecular Recognition and Synthesis, Department of Chemistry, Fudan University, 220 Handan Lu, Shanghai, 200433, China
| | - Shengming Ma
- Research Center for Molecular Recognition and Synthesis, Department of Chemistry, Fudan University, 220 Handan Lu, Shanghai, 200433, China
- Laboratory of Molecular Recognition and Synthesis, Department of Chemistry, Zhejiang University, Hangzhou, 310027, Zhejiang Province, China
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Lu, Shanghai, 200032, China
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Zhang X, Wu Z, Bao A, Zhao Z, Chen Y, Zhao H, Wang J, Chen C, Tong Q, Zhu H, Zhang Y. Asperflavipines C–E and aspermichalasine A: three cytochalasan heterotetramers and an unusual cytochalasan monomer from Aspergillus micronesiensis. Org Chem Front 2022. [DOI: 10.1039/d2qo00309k] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Asperflavipines C–E, three new cytochalasin heterotetramers, possessing a highly complex tetradecacyclic ring system with continuous bridged ring systems, and aspermichalasine A, possessing an unusual 5/6/5/8 ring system, were isolated.
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Affiliation(s)
- Xiaotian Zhang
- Hubei Key Laboratory of Natural Medicinal Chemistry and Resource Evaluation, School of Pharmacy, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
| | - Zhaodi Wu
- The Second Affiliated Hospital, Guangzhou University of Chinese Medicine, Guangzhou, 510120, China
| | - Alan Bao
- Hubei Key Laboratory of Natural Medicinal Chemistry and Resource Evaluation, School of Pharmacy, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
| | - Ziming Zhao
- Hubei Key Laboratory of Natural Medicinal Chemistry and Resource Evaluation, School of Pharmacy, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
| | - Yu Chen
- Hubei Key Laboratory of Natural Medicinal Chemistry and Resource Evaluation, School of Pharmacy, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
| | - Huimin Zhao
- Hubei Key Laboratory of Natural Medicinal Chemistry and Resource Evaluation, School of Pharmacy, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
| | - Jianping Wang
- Hubei Key Laboratory of Natural Medicinal Chemistry and Resource Evaluation, School of Pharmacy, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
| | - Chunmei Chen
- Hubei Key Laboratory of Natural Medicinal Chemistry and Resource Evaluation, School of Pharmacy, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
| | - Qingyi Tong
- Hubei Key Laboratory of Natural Medicinal Chemistry and Resource Evaluation, School of Pharmacy, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
| | - Hucheng Zhu
- Hubei Key Laboratory of Natural Medicinal Chemistry and Resource Evaluation, School of Pharmacy, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
| | - Yonghui Zhang
- Hubei Key Laboratory of Natural Medicinal Chemistry and Resource Evaluation, School of Pharmacy, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
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3
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Wang L, Yang J, Huang JP, Li J, Luo J, Yan Y, Huang SX. Bisaspochalasins A–C: Three Cytochalasan Homodimers with Highly Fused Ring System from an Endophytic Aspergillus flavipes. Org Lett 2020; 22:7930-7935. [PMID: 33001654 DOI: 10.1021/acs.orglett.0c02860] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Li Wang
- State Key Laboratory of Phytochemistry and Plant Resources in West China and CAS Center for Excellence in Molecular Plant Sciences, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Jing Yang
- State Key Laboratory of Phytochemistry and Plant Resources in West China and CAS Center for Excellence in Molecular Plant Sciences, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China
| | - Jian-Ping Huang
- State Key Laboratory of Phytochemistry and Plant Resources in West China and CAS Center for Excellence in Molecular Plant Sciences, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China
| | - Jie Li
- State Key Laboratory of Phytochemistry and Plant Resources in West China and CAS Center for Excellence in Molecular Plant Sciences, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China
| | - Jianying Luo
- State Key Laboratory of Phytochemistry and Plant Resources in West China and CAS Center for Excellence in Molecular Plant Sciences, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yijun Yan
- State Key Laboratory of Phytochemistry and Plant Resources in West China and CAS Center for Excellence in Molecular Plant Sciences, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China
| | - Sheng-Xiong Huang
- State Key Laboratory of Phytochemistry and Plant Resources in West China and CAS Center for Excellence in Molecular Plant Sciences, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China
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Wang WX, Lei X, Yang YL, Li ZH, Ai HL, Li J, Feng T, Liu JK. Xylarichalasin A, a Halogenated Hexacyclic Cytochalasan from the Fungus Xylaria cf. curta. Org Lett 2019; 21:6957-6960. [DOI: 10.1021/acs.orglett.9b02552] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Affiliation(s)
- Wen-Xuan Wang
- School of Pharmaceutical Sciences, South-Central University for Nationalities, Wuhan, Hubei 430074, PR China
| | - Xinxiang Lei
- School of Pharmaceutical Sciences, South-Central University for Nationalities, Wuhan, Hubei 430074, PR China
| | - Yan-Ling Yang
- School of Pharmaceutical Sciences, South-Central University for Nationalities, Wuhan, Hubei 430074, PR China
| | - Zheng-Hui Li
- School of Pharmaceutical Sciences, South-Central University for Nationalities, Wuhan, Hubei 430074, PR China
| | - Hong-Lian Ai
- School of Pharmaceutical Sciences, South-Central University for Nationalities, Wuhan, Hubei 430074, PR China
| | - Jing Li
- School of Pharmaceutical Sciences, South-Central University for Nationalities, Wuhan, Hubei 430074, PR China
| | - Tao Feng
- School of Pharmaceutical Sciences, South-Central University for Nationalities, Wuhan, Hubei 430074, PR China
| | - Ji-Kai Liu
- School of Pharmaceutical Sciences, South-Central University for Nationalities, Wuhan, Hubei 430074, PR China
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