Stereoselective Multicomponent Assembly of Enantiopure Oxazolopiperidines and -azepines
作者:Nicolas Zill、Angèle Schoenfelder、Nicolas Girard、Maurizio Taddei、André Mann
DOI:10.1021/jo202455c
日期:2012.3.2
efficient diastereoselective preparation of oxazolopiperidines (4a–e) and -azepines (7a–d). The bicyclic oxazolidines were obtained from chiral N-alkenylamino alcohols via transient cyclic iminium intermediates that underwent an intramolecular cyclization from the appendant oxygen. On the basis of a series of different experimental conditions, the diastereocontrol observed during the formation of the