1,3-Diethoxy-1,3-dienes from β-diketones

Abstract

Alkylation of dimedone or cyclohexane-l,3dione with 1 equiv. of triethyloxonium fluoroborate yielded mono-enol ethers whereas excess of alkylating agent gave 1,3-diethoxy-1,3-dienes.

Regiocontrolled Synthesis of the Trimeric Quinone Framework of Conocurvone

“…To mitigate this problem, we protected the OH of the biquinone as the methyl ether. The optimized procedure 14 involved stirring a mixture of the biquinone and trimethyl oxonium tetrafluroborate in methylene chloride followed by addition of Hunig's base. A series of biquinone methyl ethers 7 was prepared in respectable yields, Scheme 1.…”