Catalytic Asymmetric Methallylation of Ketones with an (H<sub>8</sub>-BINOLate)Ti-Based Catalyst
作者:Jeung Gon Kim、Elizabeth H. Camp、Patrick J. Walsh
DOI:10.1021/ol061417y
日期:2006.9.1
The first catalytic asymmetric methallylation of ketones is reported. The catalyst, which is generated from titanium tetraisopropoxide, H-8-BINOL, 2-propanol, and tetramethallylstannane, reacts with ketones in acetonitrile to afford tertiary homoallylic alcohols in fair to excellent yields (55-99%) and fair to high enantioselectivities (46-90%). Ozonolysis of the resulting products provides access to chiral, ss-hydroxy ketones, which are not readily prepared from direct asymmetric aldol reaction of acetone with ketones.