A base-promoted (4 + 2) cyclization of N-(o-chloromethyl)aryl amides with azlactones was established, which helped construct biologically important dihydroquinolinone frameworks in good yields.

An ovel metal-free allylic CÀC s-bond cleavage of simple olefins to give valuable cinnamyl aldehydes is reported. 1,2-Aryl or alkylmigration through allylic C À Cbond cleavage occurs in this transformation, which is assisted by an alkyl azide reagent. This method enables O-atom incorporation into simple unfunctionalized olefins to construct cinnamyl aldehydes.T he reaction features simple hydrocarbon substrates, metal-free conditions,and high regio-and stereoselectivity. Scheme 1. Allylic CÀCbond cleavage.

A novel metal-free allylic C-C σ-bond cleavage of simple olefins to give valuable cinnamyl aldehydes is reported. 1,2-Aryl or alkyl migration through allylic C-C bond cleavage occurs in this transformation, which is assisted by an alkyl azide reagent. This method enables O-atom incorporation into simple unfunctionalized olefins to construct cinnamyl aldehydes. The reaction features simple hydrocarbon substrates, metal-free conditions, and high regio- and stereoselectivity.