Semicarbazide → Aminobenzophenone semicarbazone

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A number of methods for preparing 1,3,4-benzotriazepine-2-ones have been described in the literature. In general, the compounds are prepared by either of two methods from a 2-aminobenzophenone. In the first method, the 2-aminobenzophenone is treated with semicarbazide to give an aminobenzophenone semicarbazone. This product is cyclized to give the benzotriazepine-2-one. See Bull. Chem. Soc. Jap., 43, 135-138 (1970); Japanese publications 70 11,148 (CA 73:25544a) and 70 11,147 (CA 73:25545b). Alternately, a 2-aminobenzophenone hydrazone is treated with phosgene to give the desired benzotriazepine-2-one. See U.S. Pat. No. 3,176,008; J. Pharm. Sci. 63(b), 838-41 (1974) and J. Med. Chem. 7(3), 386 (1964).

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