Abstract
A base catalyzed Diels-Alder reaction of 3-hydroxy-2-pyrone with various electron-deficient dienophiles gave cycloadducts in nearly quantitative yields. The reactions proceeded with complete stereospecificity and regioselectivity. A base catalyzed Diels-Alder reaction of 3-hydroxy-2-pyrone ( 1 ) with dienophile ( 2 ) afforded cycloadducts 3 and 4 in nearly quantitative yield.
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