1,3‐Diarylpropenes firstly serve as efficient alkenylated reagents for the functionalization of pyrazolinones. In the presence of 2,3‐Dichloro‐5,6‐dicyano‐1,4‐benzoquinone (DDQ), it undergoes oxidative coupling and final dehydrogenation to give the highly substituted E,E‐α,β,γ,δ‐dienpyrazolinones in moderate to excellent yields.
An effective tandem reaction of 4-aminocoumarins and 1,3-diarylpropenes mediated by Cu(OTf)2/TBHP (tert-butyl hydroperoxide)/O2 is disclosed, which provides various benzopyrano[4,3-b]pyridines in moderate to good yields. It undergoes oxidative coupling, intramolecular cyclization, and dehydro-aromatization. This approach has the advantages of high atom economy, environmental friendliness, and wide substrate scope.
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