Asymmetric Synthesis of Tetrahydroquinolines through a [3+2] Cycloaddition Controlled by Dienamine Catalysis
作者:Wenjun Li、Jia Wei、Qianfa Jia、Zhiyun Du、Kun Zhang、Jian Wang
DOI:10.1002/chem.201402089
日期:2014.5.26
A dienamine‐mediated enantioselective 1,3‐dipolar cycloaddition catalyzed by a chiral prolinol silyl ether catalyst has been developed. Removal of the benzamide group of the intermediates could furnish chiral C‐1 substituted tetrahydroisoquinolines (see scheme) in high yields and excellent stereoselectivities.
A yet-unexploited class of azomethine imines, C,N-cyclic azomethine imines, could be successfully employed in highly enantioselective1,3-dipolarcycloaddition with enals catalyzed by titanium-BINOLate to give pharmaceutically attractive tetrahydroisoquinoline and piperidine motifs.