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Sustainable Synthetic Approach for (Pyrazol-4-ylidene)pyridines By Metal Catalyst-Free Aerobic C(sp2)–C(sp3) Coupling Reactions between 1‑Amino-2-imino-pyridines and 1‑Aryl-5-pyrazolones

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posted on 2019-07-05, 15:38 authored by Hamada Mohamed Ibrahim, Haider Behbehani
A novel, metal catalyst-free, and efficient method has been developed for the synthesis of (pyrazol-4-ylidene)­pyridine derivatives. The process involves dehydrogenative coupling of 1-amino-2-imino-pyridines with 1-aryl-5-pyrazolone derivatives utilizing O2 as the sole oxidant. The new method benefits from a high atom economy, efficiency, and substrate scope, as well as the simplicity of reaction and product purification procedures.

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