Zhang X, Tan X, Duan S, Chi Z, Liu S, Xie Z. Total Syntheses of Uncommon C
30 Terpenoids: Chamaecydin and Isochamaecydin.
Org Lett 2023;
25:7769-7774. [PMID:
37862696 DOI:
10.1021/acs.orglett.3c02483]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2023]
Abstract
(-)-Chamaecydin and (-)-isochamaecydin, two uncommon C30 terpenoids comprising abietane-type diterpenes and thujane-type monoterpenes, were achieved from β-pinene with (-)-sabinene in 18 and 20 steps, respectively. Key steps include a Claisen-Ireland rearrangement to establish the all-carbon quaternary center, a Rh catalyzed C-H bond insertion reaction to install a spiro-five-membered ring and a Lewis acid promoted cyclization of polyenes to construct the two six-membered rings.
Collapse