Dy. Kim et Sc. Huh, Enantioselective Michael reaction of nitroalkanes and chalcones by phase-transfer catalysis using chiral quaternary ammonium salts, TETRAHEDRON, 57(43), 2001, pp. 8933-8938
The catalytic enantioselective Michael reaction promoted by quaternary ammo
nium salt from cinchonidine as a phase transfer catalyst is described. Trea
tment of nitroalkanes with chalcone derivatives under mild reaction conditi
ons afforded the corresponding Michael adducts in good yields with good to
moderate enantiomeric excesses. (C) 2001 Elsevier Science Ltd. All rights r
eserved.