Fragmentation of Bicyclic γ-Silyloxy-β-hydroxy-α-diazolactones as an Approach to Ynolides
摘要:
Medium-sized ynolides were prepared by the Lewis acid-mediated fragmentation of bicyclic gamma-silyloxy-beta-hydroxy-alpha-diazolactones in which the C beta-C gamma bond is the ring fusion bond. Although these lactone fragmentation substrates reacted somewhat less efficiently than their carbocyclic counterparts, the fragmentation provided 11-membered ynolides in up to 84% yield. Unlike prior fragmentations of similar substrates, elevated temperatures were required to obtain optimum yields of the ynolide products. The ynolides reported herein have ring sizes of 10 or 11, which are the smallest reported to date.
Fragmentation of Bicyclic γ-Silyloxy-β-hydroxy-α-diazolactones as an Approach to Ynolides
作者:Ali Bayir、Matthias Brewer
DOI:10.1021/jo500634d
日期:2014.7.3
Medium-sized ynolides were prepared by the Lewis acid-mediated fragmentation of bicyclic gamma-silyloxy-beta-hydroxy-alpha-diazolactones in which the C beta-C gamma bond is the ring fusion bond. Although these lactone fragmentation substrates reacted somewhat less efficiently than their carbocyclic counterparts, the fragmentation provided 11-membered ynolides in up to 84% yield. Unlike prior fragmentations of similar substrates, elevated temperatures were required to obtain optimum yields of the ynolide products. The ynolides reported herein have ring sizes of 10 or 11, which are the smallest reported to date.