imino Diels-Alder reaction;
substituted piperidines;
triflic imide;
three component reaction;
D O I:
10.1016/j.tet.2006.09.092
中图分类号:
O62 [有机化学];
学科分类号:
070303 ;
081704 ;
摘要:
An imino Diels-Alder reaction of 2-siloxydienes with aldimines catalyzed by triflic imide (Tf2NH; 0.1 similar to 10 mol % amount) has been developed leading to substituted piperidin-4-ones. Tf2NH catalyst is compatible with basic functions, such as pyridine and indole rings in the imino Diels-Alder reaction. Furthermore, X-ray crystallographic analysis indicates that trans-2,6-diphenyl-4-piperidinone 4a obtained by this reaction has a unique conformation in the solid state. (c) 2006 Elsevier Ltd. All rights reserved.