A Diels−Alder Approach to the Stereoselective Synthesis of 2,3,5,6-Tetra- and 2,3,4,5,6-Pentasubstituted Piperidines
作者:Marcelo Sales、André B. Charette
DOI:10.1021/ol052436v
日期:2005.12.1
[structures: see text] A stereoselective synthesis of 2,3,5,6-tetra- and 2,3,4,5,6-pentasubstituted piperidines was achieved from oxidative cleavage of 2-aza-bicyclo[2.2.2]octene Diels-Alder adducts derived from N-protected 2-methyl-1,2-dihydropyridine. A chiral auxiliary mediated asymmetric synthesis of the pentasubstituted piperidine is also demonstrated. This methodology incorporates orthogonal
[结构:见正文]通过2-氮杂双环[2.2.2]辛烯的氧化裂解,实现了2,3,5,6-四-和2,3,4,5,6-五取代的哌啶的立体选择性合成衍生自N-保护的2-甲基-1,2-二氢吡啶的Diels-Alder加合物。还证实了五取代的哌啶的手性辅助介导的不对称合成。该方法结合了正交保护基团,因此提供了具有易于修饰的多样性点的哌啶骨架。