A Bidirectional S<sub>E</sub>′ Strategy for 1,5-<i>syn</i> and 1,5-<i>anti</i> Stereocontrol toward the Synthesis of Complex Polyols
作者:David R. Williams、Christopher D. Claeboe、Bo Liang、Nicolas Zorn、Nicholas S. C. Chow
DOI:10.1021/ol3015682
日期:2012.8.3
Studies report a bidirectional SE′ strategy applicable for the stereocontrolled synthesis of nonracemic 1,5-syn and 1,5-anti diols and their derivatives. Nonracemic 1,3,2-diazaborolidine auxiliaries are incorporated by chemoselective tin–boron exchange to provide reactive allylic boranes. The convergent pathway utilizes sequential reactions with two aldehydes producing stereochemical outcomes from
研究报告了一种双向 S E ' 策略,适用于非外消旋 1,5- syn和 1,5- anti二醇及其衍生物的立体控制合成。非外消旋 1,3,2-二氮杂硼烷助剂通过化学选择性锡-硼交换加入,以提供反应性烯丙基硼烷。收敛途径利用与两种醛的顺序反应,分别从循环、闭合和开放过渡态偏好产生立体化学结果。peloruside A片段16的合成分四步完成,由容易获得的醛9和13 组成。