N-alkenyl acetoacetamides can be simply obtained in good yields by reaction of acetylketene, generated by thermolysis of 2,2,6-trimethyl-4H-1,3-dioxin-4-one in refluxing toluene, with imines possessing an α-hydrogen atom.
Synthetic routes to β-lactams. Some unexpected hydrogen atom transfer reactions
作者:Laurent Boiteau、Jean Boivin、Béatrice Quiclet-Sire、Jean-Baptiste Saunier、Samir Z. Zard
DOI:10.1016/s0040-4020(97)10417-3
日期:1998.3
Appropriately substituted xanthate derivatives of N-ethenyl acetamides undergo radical cyclisation to give beta-lactams with transfer of the xanthate group. In one case, a cascade of unexpected and unusual hydrogen transfer reactions occurred. (C) 1998 Elsevier Science Ltd. All rights reserved.