有机合成中的炔基碘盐。在 (-)-Agelastatin A 和 (-)-Agelastatin B 全合成中的应用
摘要:
(-)-agelastatin A 和 (-)-agelastatin B 的不对称全合成分别从 (R)-表氯醇分 14 个步骤完成。两个序列中的关键转化是亚磺酸盐促进的炔基碘盐环化,以提供关键的官能化环戊烯中间体。根据条件,最后一步中的选择性溴化导致agelastatin A 或agelastatin B。
Alkynyliodonium Salts in Organic Synthesis. Development of a Unified Strategy for the Syntheses of (−)-Agelastatin A and (−)-Agelastatin B
摘要:
The total syntheses of natural agelastatin A and agelastatin B were accomplished via a strategy that utilized an alkynyliodonium. salt --> alkylidenecarbene --> cyclopentene transformation to convert a relatively simple amino alcohol derivative to the functionalized core of the agelastatin system. Subsequent manipulations delivered debromoagelastatin, which served as a precursor to both agelastatin A and agelastatin B. Alkylidenecarbene insertion chemoselectivity issues were explored en route to the final targets.