Prop-2-ynylic carbonates were used as a1, a2 synthons in palladium catalysed annulation reactions with bifunctional nucleophiles. Methods were developed for the synthesis of 3-methylenedihydropyran derivatives and methylenecycloalkane derivatives in good yields. The regiochemistry of such reactions is discussed based upon the proposed mechanism.
L. Geng and X. Lu, J. Chem. Soc., Perkin Trans. 1, 1992, 17 DOI: 10.1039/P19920000017
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