Asymmetric Allylboration of Aldehydes and Ketones Using 3,3‘-Disubstitutedbinaphthol-Modified Boronates

Abstract

Allylboronates derived from 3,3'-disubstituted 2,2'-binaphthols react with aldehydes and ketones to give the expected allylated products with up to >99:1 er. Highest selectivities were observed for aromatic ketones. The bis(trifluoromethyl) derivative is particularly outstanding in terms of reactivity, selectivity, and robustness. [reaction: see text]