α-hydroxy esters as inexpensive chiral auxiliaries in rhodium(II)-catalyzed cyclopropanations with vinyldiazomethanes
作者:Huw M.L. Davies、William R. Cantrell
DOI:10.1016/0040-4039(91)80206-l
日期:1991.11
High levels of asymmetric induction were achieved in rhodium(II) catalyzed cyclopropanations with chiral vinyldiazomethanes. (R)-(−)-Pantolactone is the most effective chiral auxiliary, but other α-hydroxy esters also give reasonable levels of diastereoselectivity.