On December 14, 2016, Tang, Long; Yin, Yue; Feng, Xiaoqing published a patent.Synthetic Route of 41010-50-8 The title of the patent was Method for synthesizing Pirenzepine hydrochloride key intermediate. And the patent contained the following:
The title method comprises the steps of: conducting rearrangement reaction on 1,3-dihydro-3-phenyl-2H-imidazo[4,5-B]pyridine-2-one under the action of an acidic catalyst to generate 5,11-dihydro-6H-pyrido[2,3-B][1,4]benzodiazepine-6-one, extracting with Et acetate, drying with anhydrous magnesium sulfate, and recrystallizing with anhydrous ethanol-petroleum ether mixed solvent. The method has the advantages of simple process and raw materials, little pollution, and high yield (above 99%), and recycles Et acetate and acidic catalyst, so as to save cost and protect environment. The experimental process involved the reaction of 3-Phenyl-1H-imidazo[4,5-b]pyridin-2(3H)-one(cas: 41010-50-8).Synthetic Route of 41010-50-8
The Article related to dihydro pyrido benzodiazepinone preparation, Heterocyclic Compounds (More Than One Hetero Atom): Diazepines and other aspects.Synthetic Route of 41010-50-8
Referemce:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem