Authors: Huw M.L. Davies, William R. Cantrell Jr.
Tetrahedron Lett.,
1991, 32, 6509-6512
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.