Ammonium Chloride → 4-(4-Amino-thiophen-2-ylmethyl)-2H-phthalazin-1-one

Participants

Reaction Conditions

Reaction Steps

To a suspension of 4-(4-nitro-thiophen-2-ylmethyl)-2H-phthalazin-1-one (27) (0.90 g, 5.71 mmol) in ethanol (25 mL) under a nitrogen blanket was added dropwise a solution of ammonium chloride (0.31 g, 5.7 mmol) in water 18 mL). After stirring the resultant solution for 5 minutes, iron powder (0.64 g, 11.5 mmol) was added in one portion. The yellow mixture was stirred at 80° C. for 3 hours. The reaction mixture was filtered hot through celite which was washed with ethyl acetate (80 mL). The concentrated in vacuo and then diluted with ethyl acetate (20 mL) washed with brine (20 mL), dried over magnesium, sulphate and dried in vacuo to afford the title cpd as a bright yellow powder. Single peak in LC-MS analysis, (0.68 g, 84% purity and required no further purification; m/z (LC-MS, ESP), RT=2.94 (M+H) 258.

Provenance & Evidence