Highly Enantioselective Assembly of Functionalized Tetrahydroquinolines with Creation of an All-Carbon Quaternary Center
作者:Hao Rui Tan、Hui Fen Ng、Jun Chang、Jian Wang
DOI:10.1002/chem.201103136
日期:2012.3.26
A Mannich–Michael combo: An efficient and highly enantioselective cascade process by H‐bonding catalysis for the synthesis of functionalized tetrahydroquinolines has been developed. An indane amine‐thiourea small molecule has been discovered to catalyze this process in high yields and with good diastereomeric ratios and excellent enantioselectivities (see scheme).
N-Heterocyclic-Carbene-Catalyzed Umpolung of Imines
作者:Atanu Patra、Subrata Mukherjee、Tamal Kanti Das、Shailja Jain、Rajesh G. Gonnade、Akkattu T. Biju
DOI:10.1002/anie.201611268
日期:2017.3.1
N‐Heterocycliccarbene (NHC) catalysis has been widely used for the umpolung of aldehydes, and recently for the umpolung of Michael acceptors. Described herein is the umpolung of aldimines catalyzed by NHCs, and the reaction likely proceeds via aza‐Breslow intermediates. The NHC‐catalyzed intramolecular cyclization of aldimines bearing a Michael acceptor resulted in the formation of biologically important