Abstract
A highly efficient method is disclosed for the synthesis of 1,2-dichalcogen heterocycles via [3 + 2] cycloaddition of cyclopropenone derivatives and elemental chalcogens. Different from other cyclopropenone derivatives, cyclopropenselenones undergo unprecedented rearrangement with elemental sulfur. The features of this protocol include mild reaction conditions, high efficiency, excellent atom economy, gram-scale ability, and good regioselectivity.
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