Synthesis of Functionalized γ-Lactone via Sakurai <i>exo</i>-Cyclization/Rearrangement of 3,3-Bis(silyl) Enol Ester with a Tethered Acetal
作者:Zhiping Yin、Zengjin Liu、Zhenggang Huang、Yang Chu、Zhiwen Chu、Jia Hu、Lu Gao、Zhenlei Song
DOI:10.1021/acs.orglett.5b00437
日期:2015.3.20
functionalized γ-lactones has been developed involving Sakurai exo-cyclization/rearrangement of 3,3-bis(silyl) enol esters with a tethered acetal. While the steric and electronic effects of geminal bis(silane) favor the desired Sakurai pathway, the methoxy species formed in the deprotection step also facilitates both cyclization and rearrangement. The synthetic value of this approach has been demonstrated by efficiently
已经开发出一种有效的功能化的γ-内酯的合成方法,该方法涉及3,3-双(甲硅烷基)烯醇酯与束缚缩醛的樱井外环化/重排。尽管双(硅烷)双胍的空间和电子效应有利于所需的樱井途径,但在脱保护步骤中形成的甲氧基也促进了环化和重排。该方法的合成价值已通过有效地将E-乙烯基硅烷转化为烯炔和将γ-内酯部分转化为多取代THF的方法得到了证明。