Enantioselective conjugate additions of organolithiums to BHA enoates mediated by A chiral ligand
作者:Yasutomi Asano、Akira Iida、Kiyoshi Tomioka
DOI:10.1016/s0040-4039(97)10366-5
日期:1997.12
The conjugate addition reactions of BHA alkenoates with organolithiums in toluene or toluene-hexane at -78 degrees C were mediated by the chiral ligands 1 and 2 to give the corresponding 3-substituted alkanoates in high ees and high yields. The two ligands are complementary each other, 1 is effective for phenyl-and vinyllithiums to give the adducts in 64-93% ee, while 2 is effective for butyl-and ethyllithiums to give the adducts in 91-99% ee. (C) 1997 Elsevier Science Ltd.