NHC–gold(<scp>i</scp>) catalysed [4 + 2] cycloaddition–acyclic addition of dialkyl substituted propargylic esters with 1,3-diphenylisobenzofuran: synthesis of novel benzo[c]fluorenols and substituted dienes
作者:Ramesh Kotikalapudi、A. Leela Siva Kumari、K. C. Kumara Swamy
DOI:10.1039/c4ra01105h
日期:——
A gold carbene complex [IPrAuCl/AgSbF6] catalysed novel cycloaddition of propargylic esters with 1,3-diphenylisobenzofuran is reported. A [4 + 2] cycloaddition followed by sequential aromatic allylation leading to pentannulation with the expulsion of benzoic acid, then 1,2-phenyl migration coupled with ring opening and aromatisation leading to a new class of benzofluorenols, is discovered. This process