<i>tert</i>-Butyldimethylsilyl-Directed Highly Enantioselective Approach to Axially Chiral α-Allenols
作者:Juntao Ye、Wu Fan、Shengming Ma
DOI:10.1002/chem.201201948
日期:2013.1.7
A highly efficient and enantioselective synthesis of axially chiral α‐allenols was realized in practical yields with 96–99 % ee or de from TBS‐protected propargylic alcohols, aldehydes, and a commercially available, inexpensive, chiral, secondary amine (S)‐α,α‐diphenylprolinol or its enantiomer followed by desilylation. The easily removable TBS group not only acts as a protecting group, but also as
从TBS保护的炔丙醇,醛和市售的廉价手性仲胺(S)-α中以96-99%ee或de的实际收率实现了轴向手性α-烯醇的高效和对映选择性合成 ,α-二苯基脯氨醇或其对映异构体,然后进行去甲硅烷基化。易于除去的TBS基团不仅充当保护基团,而且还充当可能的空间定向基团,以实现出色的对映选择性并就地防止可能的烯丙基外消旋化。