Synthesis of enantiomerically pure α-hydroxyaldehydes from the corresponding α-hydroxycarboxylic acids: novel substrates for Escherichia coli transketolase
We herein report a general, practical, and highly efficient method for asymmetricsynthesis of a wide range of chiral vicinal diamines via reductive coupling of imines templated by chiral diboron. The protocol features high enantioselectivity and stereospecificity, mild reaction conditions, simple operating procedures, use of readily available starting materials, and a broad substrate scope. The method
Highly Efficient Asymmetric Esterification of Cyclic meso-Dicarboxylic Anhydrides Catalyzed by Diphenylboryl Triflate
作者:Masahiro Ohshima、Teruaki Mukaiyama
DOI:10.1246/cl.1987.377
日期:1987.2.5
In the presence of a catalytic amount of diphenylboryl triflate, cyclic meso-dicarboxylic anhydrides are esterified by diphenylboric ester of (R)-2-methoxy-1-phenylethanol in a highly stereoselective manner, and, after the treatment with diazomethane, the chiral diesters are obtained with high diastereomeric excess.