Acetic Acid → 5-Amino-7-fluoro-4-((1-methyl-1H-1,2,4-triazol-5-yl)methyl)phthalazin-1(2H)-one

Participants

Reaction Steps

To a solution of 6-fluoro-3-((1-methyl-1H-1,2,4-triazol-3-yl)methylene)-4-nitroiso-benzofuran-1(3H)-one (3) (4.0 g, 135 mmol) in THF (100 mL) was added hydrazine monohydrate (85%) (6 mL) at room temperature under nitrogen atmosphere. The mixture was stirred for 2 hours, then acetic acid (6 mL) was added and the mixture was heated to and kept at 60° C. for 18 hours. The resulting mixture was diluted with water (100 mL) and extracted with ethyl acetate (100 mL×3). The organic layer was dried over anhydrous Na2SO4 and evaporated to dryness to afford the title compound as a yellow solid (1.6 g, yield 42%). LC-MS (ESI) m/z: 275 (M+1)+.

Provenance & Evidence