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Formamides having 1-arylalkyl groups on nitrogen undergo an unprecedented dehydrogenative 4 + 2 cycloaddition reaction with alkynes via nickel/AlMe(3) cooperative catalysis to give highly substituted dihydropyridone derivatives in good yields. Notably, the transformation proceeds through double functionalization of C(sp(2))-H and C(sp(3))-H bonds in the formamides.
Nakao et al. (Tue,) studied this question.