A variety of ortho,ortho'-disubstituted hydrobenzoin derivatives are readily accessible through a directed ortho,ortho'-dimetalation strategy in which the alcohol functions in hydrobenzoin are deprotonated by n-BuLi and the resulting lithium benzyl alkoxides serve as directed metalation groups. The optimization and scope of this reaction are discussed, and the utility of this process is demonstrated in the one-pot preparation of a number of chiral diols as well as a short synthesis of the chiral ligand Vivol.
通过一种定向的ortho,ortho'-二取代氢苯并衍生物易于通过定向的ortho,ortho'-二金属化策略获得,其中氢苯并中的醇基被n-BuLi去质子化,产生的锂苄基烷氧化物作为定向的金属化基团。讨论了这种反应的优化和范围,并展示了该过程在多种手性二醇的一锅法制备以及手性配体Vivol的短合成中的实用性。