A novel 2,3‐dichloro‐5,6‐dicyano‐1,4‐benzoquinone (DDQ)‐promoted intermolecular cross‐dehydrogenative coupling reaction of alkyl C( sp 3 )H bonds not adjacent to heteroatoms with vinylic C( sp 2 )H bonds has been developed. This new strategy provides a new, environmentally friendly, and efficient protocol for the synthesis of polysubstituted 1 H ‐indenes in a single step via a radical‐initiated two C( sp 2 )C( sp 2 ) and C( sp 2 )C( sp 3 ) bond formation process. magnified image
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Wang et al. (2014) studied this question.
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