Hypervalent iodine(III)-induced intramolecular cyclization reaction of substituted phenol ethers with an alkyl azido side-chain: A novel and efficient synthesis of quinone imine derivatives
Novel and efficient syntheses of quinone imine ketals (2aj) and quinone imines (4ah) from substituted phenol ethers (1ak) bearing an alkyl azido side-chain using the combination of hypervalent iodine(III) reagent, phenyliodine(III) bis(trifluoroacetate) (PIFA) and trimethylsilyl trifluoromethanesulfonate (TMSOTf), have been developed.
Simple preparation of 4-aryl- and 4-alkyl-2(5H)-furanones from β-substituted crotonic esters
Treatment of β-aryl- or β-alkylcrotonic esters with selenium dioxide in acetic acid in the presence of a catalytic amount of perchloric acid gave 4-substituted 2(5H)-furanones in moderate to good yields.
Kagabu,Shimizu,Ito,Moriya
p. 830 - 832
(2007/10/02)
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