Enantioselective amination of silylketene acetals with (N-arylsulfonylimino)phenyliodinanes catalyzed by chiral dirhodium(II) carboxylates: asymmetric synthesis of phenylglycine derivatives

摘要

The first catalytic enantioselective amination of silylketene acetals with (N-arylsulfonylimino) phenyliodinanes is described. The reaction of silylketene acetals derived from methyl phenylacetates with [N-(2-nitrophenylsulfonyl)imino] phenyliodinane (NsN = IPh) under the catalysis of dirhodium(II) tetrakis[N-tetrachlorophthaloyl-(S)-tert-leucinate], Rh_{2}(S-TCPTTL)_{4}, proceeds in benzene at room temperature to give N-(2-nitrophenylsulfonyl) phenylglycine derivatives in high yields and with enantioselectivities of up to 99% ee.