Phosphorus oxychloride → 7-Acetamino-1-chloro-4-(4-pyridylmethyl)phthalazine

Participants

Reaction Conditions

Reaction Steps

Under a nitrogen atmosphere, a suspension of 2.24 g (7.6 mmol) 7-acetamino-1-hydroxy-4-(4-pyridylmethyl)phthalazine hydrochloride (≡1-oxo-4-[pyridyl-(4′)-methyl]-7-acetamino-1,2-dihydrophthalazine hydrochloride: for preparation see German Auslegeschrift no. 1 061 788 [published Jul. 23, 1959]) in 22 ml acetonitrile is spiked with 1.74 ml (19 mmol) phosphoroxychloride and heated for 4 h to 95° C. The mixture is cooled to 10° C., and 7.5 g NaHCO3 in 30 ml water is added. The deep-red suspension is stirred for 15 min, filtered, and washed out with water. Drying under HV yields the title compound: HPLC: tRet(Grad5-40)=10.2; FAB MS (M+H)+=313.

Provenance & Evidence