反应详情

As shown below in the Examples, a preferred process is set forth for making 2-amino-5,6-dichloro-3,4-dihydroquinazoline from commercially available starting materials. In one process 1,2,3-trichlorobenzene is used as the starting material and is nitrated using, for example, nitric/sulfuric acids to form 1,2,3-trichloro-4-nitrobenzene. This compound is then reacted with a cyanating agent such as CuCN to form 2,3-dichloro-6-nitrobenzonitrile. The nitrile is then reacted under reducing conditions using for example B2H6 to form 2,3-dichloro-6-nitrobenzylamine HCl which is then reduced and reacted with CNX to form the desired compound.