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.
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Xiyan Lu (1992) studied this question.
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