Triethylamine → 1-Benzyloxy-3-[2-[(diethoxyphosphoryl)acetyl]hydrazino]-7-trifluoromethylquinoxalin-2(1H)-one

Participants

Reaction Steps

A solution of (diethoxyphosphoryl)acetyl chloride (5.8 g, 27 mmol) in 40 ml of dry tetrahydrofuran was added to a solution of 1-benzyloxy-3-hydrazino-7-trifluoromethylquinoxalin-2(1H)-one (8.75 g, 25 mmol) and dry triethylamine (3.6 ml, 27 mmol) in 200 ml of dry tetrahydrofuran. The mixture was stirred at room temperature for 3 h and filtered. The filtrate was evaporated to dryness, and the residue was crystallized by trituration with water (200 ml) to give 12.85 g (97%) of the title compound. M.p. 163°-166° C.

Provenance & Evidence