Abstract
A phosphine catalyzed regiodivergent annulation of γ-substituted allenoates with conjugated dienes is reported, and highly functionalized cyclohexenes or cyclopentenes were obtained in high yields and regioselectivities. This transformation takes advantage of mild conditions, wide substrate scope and significant functional group tolerance. The high regioselectivity can be achieved by tuning the nucleophilicity of the phosphine catalyst.
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