A facile method for synthesis of three carbon-homologated carboxylic acid by regioselective ring-opening of β-propiolactones with organocopper reagents
β-carbon-oxygen fission to give 3-substituted propionic acids. Among these three kinds of organocopper reagents, diorganocuprate, especially halomagnesium cuprate gave the highest yields of the acids, which was remarkably observed in the ring-opening of sterically hindered β-propiolactones such as β-methyl- and α,β -dimethyl-β-propiolactones and also in the reactions using the organocopper reagents with vinyl and
STEREOSELECTIVE SYNTHESIS OF<i>MESO</i>(OR<i>ERYTHRO</i>) 1,3-DIOLS FROM β-HYDROXYKETONES
作者:Koichi Narasaka、Hong Chang Pai
DOI:10.1246/cl.1980.1415
日期:1980.11.5
Meso(or erythro) 1,3-diols are prepared in high stereoselectivity from β-hydroxyketones by the treatment with tributylborane and the successive reduction with sodium borohydride.