By utilizing the dual reactivity function of N-aminopyridinium ylides, we develop direct [3 + 2]-cycloadditions of N-aminopyridinium ylides and ynals to build pyrazolo[1, 5-a]pyridines core while introducing a cyano group....

Rh (III)-catalyzed dienylation and cyclopropylation of 1,2,3-benzotriazinones with alkylidenecyclopropanes (ACPs) has been achieved. Different from the previous reports of 1,2,3-benzotriazinones, the triazinone ring remained intact in this C–H bond functionlization reaction. Also, the denitrogenative cyclopropylation could also be realized by changing the reaction temperature. This protocol is featured with high E selectivity, wide substrate scope, and divergent structures of products.