Hydrazine → 4-(3,5-Dichloro-pyridin-4-ylmethyl)-7-methoxy-2H-phthalazin-1-one

Participants

Reaction Steps

Hydrazine (18.4 ml, 0.378 moles) was added to a suspension of 3-(3,5-dichloro-pyridin-4-ylmethylen)-6-methoxy-3H-isobenzofuran-1-one (24.4 g, 0.126 moles), obtained as described in example 11, in CH3OH (200 ml), under N2. The mixture was heated under reflux for 1 hour, then kept overnight at room temperature, cooled in ice, and the solid was filtered, washed with very cold CH3OH and dried in oven at 50° C. under vacuum, to give 33.3 g of the title compound (yield: 80%). m.p.: 259-262° C.

Provenance & Evidence