3-Chloro-6-(1-piperazinyl)pyridazine → 3-(1-Methylethoxy)-6-(1-piperazinyl)pyridazine

Participants

Reaction Steps

3-Chloro-6-piperazinopyridazine (4.0 g) (J. Med. Chem., 5, 541 (1963)) and sodium isopropoxide, prepared by addition of sodium (0.7 g) to dry isopropanol (70 ml), were heated in a bomb at 130°-140° C. for 10 hours. The solvent was evaporated in vacuo, the residue taken up in methylene chloride (300 ml) and the resulting solution washed with water (2×50 ml). The organic extract was dried (Na2SO4) and evaporated in vacuo to give 3-isopropoxy-6-piperazinopyridazine (3.3 g). A sample in ethyl acetate, was converted to the maleate salt by treatment with maleic acid in ethyl acetate. The resulting solid was re-crystallized from ethanol, m.p. 144°-145° C.

Provenance & Evidence