Vk. Aggarwal et al., CATALYTIC ASYMMETRIC CYCLOPROPANATION OF ELECTRON-DEFICIENT ALKENES MEDIATED BY CHIRAL SULFIDES, Chemical communications, (18), 1997, pp. 1785-1786
Catalytic asymmetric cylopropanation of enones has been achieved using
diazo compounds, catalytic quantities of a metal catalyst and a camph
or-derived thioacetal; this sulfide shows exceptionally high levels of
enantioselectivity.