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1. (WO1997020828) PROCESS FOR PREPARING 3-AMINO-1,2,4-BENZOTRIAZINE DIOXIDE

Pub. No.:    WO/1997/020828    International Application No.:    PCT/US1996/018761
Publication Date: Jun 12, 1997 International Filing Date: Nov 21, 1996
IPC: C07D 253/10
Applicants: SANOFI
PHILION, Richard, E.
Inventors: PHILION, Richard, E.
Title: PROCESS FOR PREPARING 3-AMINO-1,2,4-BENZOTRIAZINE DIOXIDE
Abstract:
Process of producing 3-amino-1,2,4-benzotriazine 1,4-dioxide by reacting benzofurazan-1 oxide with disodiumcyanamide under homogeneous conditions followed by allowing crystallization to occur in a buffered solution. In a preferred embodiment, the process comprises reacting benzofurazan-1 oxide with cyanamide and sodium hydroxide under homogeneous conditions followed by purification in a mixture of acetone and acetic acid.