Patent ID: 9732043
Date: 2017-08-15
CPC Classifications: C07D,Y10T

Claim:
1. A process for preparing 5-amino-2,3-dihydrophthalazine-1,4-dione monosodium salt, the process comprising the steps of: (i) providing a mixture of 3-nitrophthalic acid and acetic acid; (ii) reacting the mixture of 3-nitrophthalic acid and acetic acid with hydrazine hydrate to provide 3-nitrophthalhydrazide; (iii) providing a solution of 3-nitrophthalhydrazide and sodium hydroxide in water; and (iv) hydrogenating the solution of 3-nitrophthalhydrazide and sodium hydroxide in water to provide 5-amino-2,3-dihydrophthalazine-1,4-dione monosodium salt.