Water → 2-Phenyl-[1,2,4]triazolo[1,5-a]pyridin-7-ylamine

Participants

Reaction Steps

A suspension of (2-phenyl-[1,2,4]triazolo[1,5-a]pyridin-7-yl)-carbamic acid tert-butyl ester (8.5 g, 27.4 mmol) in hydrochloric acid (6 N in diethyl ether, 175 ml) is stirred overnight at room temperature. The suspension is diluted under cooling with water (ca 2 l) and ethyl acetate, the aqueous layer is washed once with ethyl acetate, made alkaline with 32% aqueous sodium hydroxide and extracted twice with ethyl acetate. The combined organic layers are dried with magnesium sulfate and the solvent is removed in vacuo affording 2-phenyl-[1,2,4]triazolo[1,5-a]pyridin-7-ylamine (5.52 g, 95.9%) as a light pink solid. mp.: 212-213° C. MS: m/z=211.2 (M+H+).

Provenance & Evidence