The enantioselective cyclization of N-acyliminium ions generated in situ from tryptamine is promoted with high enantioselectivity by a new chiral thiourea catalyst. This represents the first successful system for asymmetric catalysis of the Pictet-Spengler reaction.
Organocatalytic Asymmetric Transfer Hydrogenation of Nitroolefins
作者:Nolwenn J. A. Martin、Lidia Ozores、Benjamin List
DOI:10.1021/ja074045c
日期:2007.7.1
We describe a highly efficient and highly enantioselective Hantzsch ester mediated conjugate transfer hydrogenation of beta,beta-disubstituted nitroolefins that is catalyzed by a Jacobsen-type thiourea catalyst.