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Acylation reaction of γ,β-unsaturated β-keto esters and of ethyl hydrogen malonate. Synthesis of 6-alkenyl-5-ethoxycarbonyl-2,3-dihydro-4H-pyran-4-ones and 4,5-dioxo-2,3,7,8-tetrahydro-4H,5H-pyrano[4,3-b]pyran derivatives
Abstract
The syntheses of 6-alkenyl-5-ethoxycarbonyl-2,3-dihydro-4H-pyran-4-one derivatives by acylation of γ,β-unsaturated β-keto esters or by diacylation of ethyl hydrogen malonate with α,β-unsaturated acyl chlorides are described. These compounds were converted to 4,5-dioxo-2,3,7,8-tetrahydro-4H,5H-pyrano[4,3-b]pyran derivatives.
