Functional rearrangement of 3-Cl or 3,3-diCl-γ-lactams bearing a secondary 1-chloroalkyl substituent at C-4
作者:Mariella Pattarozzi、Fabrizio Roncaglia、Luca Accorsi、Andrew F. Parsons、Franco Ghelfi
DOI:10.1016/j.tet.2009.11.111
日期:2010.2
The study of the reaction with MeONa/MeOH of chlorinated gamma-lactams. prepared from the atom transfer radical cyclization of N-allyl-alpha-perchloroamides, has been extended to the case of substiates carrying an exo halogen atom on a branched carbon Only with secondary exo C-Cl groups, that are not located on a fused ring, does the functional rearrangement follow the typical transformation route, Which With trichloro-lactams can proceed further to give 4-alkylidene derivatives From a practical point of view, the outcome of the reaction with di- or trichloio N-cinnamylamides is synthetically valuable, affording the 5-methoxy-IH-pyrrol-2(5H)-one or 3-benzylidenepyrrlidine-2.5-dione. respectively. in good to excellent yield (C) 2009 Elsevier Ltd All rights reserved