A short approach to chaetomellic anhydride A from 2,2-dichloropalmitic acid: elucidation of the mechanism governing the functional rearrangement of the chlorinated pyrrolidin-2-one intermediate
作者:Franco Bellesia、Chiara Danieli、Laurent De Buyck、Roberta Galeazzi、Franco Ghelfi、Adele Mucci、Mario Orena、Ugo M. Pagnoni、Andrew F. Parsons、Fabrizio Roncaglia
DOI:10.1016/j.tet.2005.09.140
日期:2006.1
Chaetomellic anhydride A was efficiently attained in three steps, starting from 2,2-dichloropalmitic acid and 2-(3-chloro-2-propenylamino)pyridine. Atom transfer radical cyclisation selectively formed the cis-stereoisomer of the trichloropyrrolidin-2-one, which underwent a stereospecific functional rearrangement to form a substituted maleimide. The choice of 2-pyridyl, as ‘cyclisation auxiliary’ in