Enantioselective Alkylation of Aldehydes with Chiral Organomagnesium Amides (COMAs)
作者:Kelvin H. Yong、Nicholas J. Taylor、J. Michael Chong
DOI:10.1021/ol0258132
日期:2002.10.1
[GRAPHICS]Dialkylmagnesiums react with chiral secondary amines to form chiral organomagnesium amides (COMAs). These reagents alkylate aldehydes to form secondary alcohols with enantioselectivities up to 91:9 er.
Catalytic Enantioselective Borohydride Reduction of <i>Ortho</i>-Fluorinated Benzophenones
[reaction: see text] In the presence of the optically active ketoiminatocobalt(II) complexes, the enantioselective borohydride reduction of benzophenones was successfully completed. The fluorine atom on the ortho position of the benzophenone and aryl ketones proved effective for obtaining high enantioselectivities. The combined use of modified lithium borohydride afforded the corresponding benzhydrols