Abstract
A new strategy for the facile and efficient synthesis of 4‐isochromanones has been developed. The reaction involves a Cu(OTf)2‐catalysed sequential reaction of epoxides carrying electron‐deficient alkenes using the solvent DMSO as the oxidant. The single‐step process involves a sequential oxidative ring opening of epoxides and an oxa‐Michael addition where one new C=O bond and one new C–O bond are created. The advantages of this approach include high efficiency, a broad substrate scope, and mild conditions.
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