Organocatalytic Asymmetric Synthesis of trans-1,3-Disubstituted Tetrahydroisoquinolines via a Reductive Amination/Aza-Michael Sequence
作者:Dieter Enders、Jens X. Liebich、Gerhard Raabe
DOI:10.1002/chem.201001623
日期:2010.8.23
Benzothiazoline better than Hantzsch: A stereoselective Brønsted acid catalyzed reductive amination/aza‐Michael approach towards the important class of tetrahydroisoquinolines is presented (see scheme). A biphenyl‐substituted benzothiazoline is used as the reducing agent and leads to superior yields and enantiomeric excesses compared with the frequently used Hantzsch ester. The cyclization of the amine