B. Heckmann et al., GRIGNARD ADDITIONS TO ALPHA,BETA-UNSATURATED DIOXOLANONES - PREPARATION OF CHIRAL ALLYLIC ALCOHOLS AND PROTECTED ALPHA-HYDROXY ALDEHYDES, Tetrahedron letters, 37(9), 1996, pp. 1421-1424
alpha,beta-Unsaturated dioxolanones derived from mandelic acid smoothl
y add most Grignard reagents with good to excellent regio- and diaster
eoselectivities. The adducts are converted to chiral secondary alcohol
s by peroxidation at low temperature or to protected alpha-hydroxy ald
ehydes via ozonolysis.