| abstract |
NEW MATERIAL:3-Tetrazolyl-1-azaxanthone derivative I (ring A may be substituted; R is H, amino, OH). n EXAMPLE: 7-Isopropyl-3-(1H-tetrazol-5-yl)-1-azaxanthone. n USE: Antiallergic agent effective to allergic asthma, allergic dermatitis, hay fever etc. n PROCESS: The compound I is pareped by reaciting a compound II with hydrazoic acid or its salt. The compound II can be obtained by reacting a compound R 1 -CN (R 1 is HC-C-, NC-CH 2 -, R 2 OCOCH 2 -; R 2 is 1-3C alkyl) with a compound IV which is obtained by the reaction of a compound III with water in the presence of a base n COPYRIGHT: (C)1979,JPO&Japio |