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
Total synthesis of lycorine-type alkaloids by cyclopropyl ring-opening rearrangement
作者:Dandan Liu、Long Ai、Fan Li、Annan Zhao、Jingbo Chen、Hongbin Zhang、Jianping Liu
DOI:10.1039/c4ob00126e
日期:——
A practical method for the synthesis of lycorine-typealkaloids with cis-B/C ring structure has been developed. Based on the reactions of aminocyclization, palladium-mediated arylation and especially cyclopropyl ring-opening rearrangement, the synthesis of anhydrocaranine, (±)-γ-lycorane and putative (±)-amarbellisine was accomplished.