Synthesis of 4,4-Disubstituted β-Lactams by Regiospecific Electrophile- and Silver-Induced Ring Expansion of 2,2-Disubstituted 1-Methoxycyclopropylamines
作者:Norbert De Kimpe、Kourosch Abbaspour Tehrani、Gwendolien Fonck
DOI:10.1021/jo960296k
日期:1996.1.1
2,2-Disubstituted 1-methoxycyclopropylamines underwent regiospecific ringexpansion to 1,4,4-trisubstituted 2-azetidinones by N-chlorination with tert-butyl hypochlorite and subsequent rearrangement with silver tetrafluoroborate. Upon thermolysis, 4,4-disubstituted beta-lactams suffer a characteristic ring opening to afford beta,gamma-unsaturated carboxylic amides. The reduction of 1,4,4-trisubstituted