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The lithiated anion of diethyl α-trimethylsilyl-prenylphosphonate, readily in situ generated from diethyl prenylphosphonate, reacts smoothly with various alkyl formates to give the title compounds with exclusive 1-(Z)-geometry and in high isolated yield. The [4 + 2] cycloaddition reaction of dienes 3 with electron-deficient dienophiles is described.
Lithiated anion of diethyl α-trimethylsilyl-crotylphosphonate, in-situ generated from readily available diethyl crotylphosphonate, reacts smoothly with ethyl formate or ethyl chloroformate to give the title compounds 1 or 2, respectively, in high isolated yield.
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