Dirhodium tetrakis(S-(N-dodecylbenzenesulfonyl)prolinate)(Rh2S-DOSP4) catal
yzed decomposition of methyl alkynyldiazoacetates in the presence of alkene
s results in highly diastereoselective and enantioselective cyclopropanatio
ns. (C) 2000 Published by Elsevier Science Ltd.