Formation and Reactivity of Silacyclopropenes Derived from Siloxyalkynes: Stereoselective Formation of 1,2,4-Triols
作者:Timothy B. Clark、K. A. Woerpel
DOI:10.1021/ol061652g
日期:2006.8.1
oxasilacyclopentenes. The embedded silyl enol ether functionality was treated with various aldehydes and a catalytic amount of Sc(OTf)3 to provide dioxasilacycloheptanones, which resulted from an aldol addition/rearrangement. Stereoselective reduction or allylation of the cyclic ketone, followed by n-Bu4NF deprotection, provided high yields of 1,2,4-triols possessing four contiguous stereocenters.
磷酸银催化的亚甲硅烷基转移到甲硅烷氧基炔烃上,提供了具有甲硅烷基烯醇醚官能团的甲硅烷基环丙烯。铜催化的羰基化合物的插入提供了相应的氧杂硅烷基环戊烯。用各种醛和催化量的Sc(OTf)3处理嵌入的甲硅烷基烯醇醚官能团,以提供由醛醇加成/重排引起的二氧杂硅环环庚酮。环酮的立体选择性还原或烯丙基化,然后进行n-Bu4NF脱保护,可提供高产率的具有四个连续立体中心的1,2,4-三醇。