Alkynyliodonium Salts in Organic Synthesis. Application to the Total Synthesis of (−)-Agelastatin A and (−)-Agelastatin B
作者:Ken S. Feldman、Joe C. Saunders
DOI:10.1021/ja027121e
日期:2002.8.1
The asymmetric total syntheses of (-)-agelastatin A and (-)-agelastatin B were accomplished in 14 steps each from (R)-epichlorohydrin. The pivotal transformation in both sequences was a sulfinate-promoted cyclization of an alkynyliodonium salt to furnish a key functionalized cyclopentene intermediate. Selective bromination in the final step led to either agelastatin A or agelastatin B, depending upon
(-)-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。