Abstract
An efficient and catalyst free protocol has been disclosed for aza-Michael addition reaction of pyrazoles with 2-aryl-3-nitro-2H-chromene derivatives, which provides synthetically important 4-pyrazole-3-nitrobenzopyrans at room temperature. In this one-pot transformation, good to excellent yield of the products up to 84% were obtained and generated a new CN bond. The relative configuration of the product was characterized by a single crystal X-ray crystallography. This protocol is extensively applicable for the wide substrate scope, high yields, easy accessibility, as well as base and catalyst free condition.
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