A catalytic and enantioselective cyclopropylation of aldehydes using dicyclopropylzinc
Enantioselective cyclopropylation of various aldehydes proceeds using dicyclopropylzinc in the presence of a catalytic amount of chiral amino alcohol or thiophosphoramidate with Ti(OPr1)4 to provide enantiomerically enriched cyclopropyl alkanols (up to 96.6% ee).