Conversion of O-Propargyl β-enones to 2-Allylidene 1,3-Diones and Furan Derivatives via [3,3]-Sigmatropic Rearrangement

An efficient synthetic protocol was developed for the formation of 2-allylidene 1,3-diones in very good yields via [3,3]-sigmatropic rearrangement of O-propargyl beta-enones. Good yields of highly functionalized substituted furan derivatives were synthesized from O-propargyl beta-enones under gold-catalysis via intramolecular cycloisomerisation.