β‐chloro aldimines with terminal alkynes leading to a rapid and efficient formation of 2‐alkynylazetidines in good to excellent yield has been described. The catalytic hydrogenation of the 2‐alkynylazetidines resulted in acyclic secondary amines by reductive cleavage of the 2‐alkynylazetidine. Further, these non‐activated 2‐alkynylazetidines were ring expanded in a reaction with dimethyl acetylenedicarboxylate
p-Toluenesulfonic acid-promoted selective functionalization of unsymmetrical arylalkynes: a regioselective access to various arylketones and heterocycles
Regioselective hydration of a wide range of internalalkynes has been afforded in high to good yields by using PTSA in EtOH. The scope of the reaction of alkynes has been delineated. Arylaliphatic alkynes and diarylalkynes were regioselectively hydrated in good to excellent yields and short reaction times when the reaction was achieved under microwave irradiation. Moreover, diarylalkynes, arylenynes