Stereoselective conjugate addition of lactams to nitroalkenes and formal total synthesis of indolizidine 167B
作者:Akio Kamimura、Yoshiaki Nagata、Ayako Kadowaki、Kosuke Uchida、Hidemitsu Uno
DOI:10.1016/j.tet.2007.09.023
日期:2007.11
Optically active 5-substituted pyrrolidin-2-ones underwent conjugateaddition to nitroalkenes to give the corresponding adducts in a diastereoselective manner. The presence of 18-crown-6 was crucial to achieve good stereoselective addition. Addition of 6-substituted piperidin-2-ones also gave the corresponding adduct in a stereoselective manner. The adduct was readily converted into a bicyclic lactam