Visible Light-Induced Cyclization of N-Arylmethacrylohydrazides and Hydroxamic Acid Derivatives toward δ-Amidoalkylated Pyrazol-5-ones via 1,5-Hydrogen Atom Transfer.

A photoinduced radical cascade cyclization of N-arylmethacrylohydrazides and hydroxamic acid derivatives for the synthesis of pyrazol-5-ones via 1,5-hydrogen atom transfer was developed. A series of pyrazol-5-ones was obtained in good yield with a br…

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