Diastereoselective synthesis of dimethyl cyclopropane-1,1-dicarboxylates from a γ-alkoxy-alkylidene malonate and sulfur and phosphorus ylides

Article abstract of DOI:10.1016/S0040-4039(97)10822-X

Isopropylidene diphenylsulfurane and isopropylidene triphenylphosphorane react by the same (Re) face of the alkylidene malonate derived from the acetonide of (d)-glyceraldehyde to produce almost exclusively a single diastereoisomer of the corresponding dimethyl cyclopropane-1,1-dicarboxylate.