A Three-Step Synthesis of the Guaianolide Ring System
作者:Jan Hullaert、Duchan R. Laplace、Johan M. Winne
DOI:10.1002/ejoc.201402170
日期:2014.5
By using a gallium(III) triflate catalyzed intramolecular (4+3) cycloaddition, a few functionalized furan-derived tricycles that share the common guaianolide sesquiterpene ringsystem were prepared in a stereoselective manner in only three steps from commercially available starting materials. A discussion of the formation of alternative products is included, with possible substrate requirements to