化学
环丙烷
立体中心
立体选择性
对映选择合成
全合成
立体化学
烯烃纤维
苷元
催化作用
环丙烷化
组合化学
非对映体
戒指(化学)
有机化学
糖苷
作者
Bo Xu,Chang Liu,Mingji Dai
摘要
We report a 13-step enantioselective and stereoselective total synthesis of (−)-peyssonnoside A, a unique diterpene glucoside with a rare and highly congested pentasubstituted cyclopropane and promising antimicrobial activity. Among the 10 steps to synthesize (−)-peyssonnosol, the aglycone of (−)-peyssonnoside A, eight transition-metal-catalyzed transformations enabled the construction of all new C–C bonds and stereocenters without involving any protecting groups. Notably, a palladium-catalyzed dearomative cyclization was used to build the C-6 spiro all-carbon quaternary center, and a counterintuitive hydrogen atom transfer (HAT)-initiated reductive olefin cross-coupling was realized to forge the pentasubstituted cyclopropane ring with excellent stereoselectivity.
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