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
A new synthetic route to tyromycin A and its analogue from renewable resources
作者:Fabrizio Roncaglia、Christian V. Stevens、Franco Ghelfi、Marijke Van der Steen、Mariella Pattarozzi、Laurent De Buyck
DOI:10.1016/j.tet.2008.11.091
日期:2009.2
involving as featuring steps a transition metal catalyzed atom transfer radical cyclization and a functional rearrangement of the polyhalogenated 2-pyrrolidinones thus obtained, are described. Both routes use 10-undecenoic acid, a renewable source from castor oil, as starting material for the preparation of the pivotal intermediates α,α,α′,α′-tetrachlorodicarboxylic acids.