|
1
|
Makino K, Nogami C, Sueki S, Anada M. Total synthesis of breviscapin B via intramolecular dehydrative etherification. Org Biomol Chem 2025; 23:5133-5138. [PMID: 40098540 DOI: 10.1039/d5ob00350d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/19/2025]
Abstract
The total synthesis of breviscapin B, a norlignan natural product having an unusual 2,2-diaryltetrahydrofuran skeleton, has been achieved via intramolecular dehydrative Williamson ether synthesis as a key step. The use of a combination of p-TsOH·H2O and polyfluorinated alcohol was found as an effective method for the synthesis of 2-aryl-substituted saturated oxygen heterocycles.
Collapse
Affiliation(s)
- Kosho Makino
- Faculty of Pharmacy, Musashino University, 1-1-20, Shinmachi, Nishitokyo-shi, Tokyo, 202-8585, Japan.
- Research Institute of Pharmaceutical Sciences, Musashino University, 1-1-20, Shinmachi, Nishitokyo-shi, Tokyo, 202-8585, Japan
| | - Chiharu Nogami
- Faculty of Pharmacy, Musashino University, 1-1-20, Shinmachi, Nishitokyo-shi, Tokyo, 202-8585, Japan.
| | - Shunsuke Sueki
- Faculty of Pharmacy, Musashino University, 1-1-20, Shinmachi, Nishitokyo-shi, Tokyo, 202-8585, Japan.
- Research Institute of Pharmaceutical Sciences, Musashino University, 1-1-20, Shinmachi, Nishitokyo-shi, Tokyo, 202-8585, Japan
| | - Masahiro Anada
- Faculty of Pharmacy, Musashino University, 1-1-20, Shinmachi, Nishitokyo-shi, Tokyo, 202-8585, Japan.
- Research Institute of Pharmaceutical Sciences, Musashino University, 1-1-20, Shinmachi, Nishitokyo-shi, Tokyo, 202-8585, Japan
| |
Collapse
|
|
2
|
Liu B, Wang L, Qin Y, Xu X, Zhao J. Synthesis of Trisubstituted Chromanes by Lewis-Base-Catalyzed Three-Component Electrophilic Thiofunctionalization of Cyclopropene with Phenols via a Formal [3 + 3] Annulation. Org Lett 2022; 24:5693-5697. [PMID: 35921617 DOI: 10.1021/acs.orglett.2c02072] [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
A Lewis-base-catalyzed three-component electrophilic thiofunctionalization of cyclopropene with phenol is developed to furnish various trisubstituted chromanes in high trans-diasteroselectivity. This metal-free protocol is easy to scale-up, offers a unique 2,2,3-substitution pattern, and delivers chromanes with diversified core substitution patterns. The unprecedented tolerance of strong electron-withdrawing substituents at the phenol renders the protocol indispensable to access the otherwise inaccessible chromane chemical space that is important for medicinal chemistry campaigns.
Collapse
Affiliation(s)
- Bowen Liu
- Faculty of Chemistry and Biology, Changchun University of Technology, 2055 Yan'an Street, Changchun, Jilin 130012, China
| | - Lei Wang
- College of Chemistry, Chemical Engineering and Materials Science, Shandong Normal University, Jinan, Shandong 250014, China
| | - Yunfei Qin
- Faculty of Chemistry and Biology, Changchun University of Technology, 2055 Yan'an Street, Changchun, Jilin 130012, China
| | - Xianxiu Xu
- College of Chemistry, Chemical Engineering and Materials Science, Shandong Normal University, Jinan, Shandong 250014, China
| | - Jinbo Zhao
- Faculty of Chemistry and Biology, Changchun University of Technology, 2055 Yan'an Street, Changchun, Jilin 130012, China.,School of Pharmacy, Shandong First Medical University & Shandong Academy of Medical Sciences, Tai-An, Shandong 271016, China
| |
Collapse
|