Phosphorus oxychloride → (R)-4-(3-(1-(benzyloxy)ethyl)-8-(4-chlorophenyl)-5-((2-methyl-6-(trifluoromethyl)pyridin-3-yl)methyl)-6-oxo-5,6-dihydro-[1,2,4]triazolo[4,3-b]pyridazin-7-yl)benzonitrile

Participants

Reaction Conditions

Reaction Steps

To a round bottom flask was added (R)-2-(benzyloxy)-N′-(4-(4-chlorophenyl)-5-(4-cyanophenyl)-1-((2-methyl-6-(trifluoromethyl)pyridin-3-yl)methyl)-6-oxo-1,6-dihydropyridazin-3-yl)propanehydrazide (70 mg, 0.140 mmol), toluene (3 ml). The reaction was heated to 120° C. POCl3(0.3 ml) was then added and the reaction was stirred at 120° C. for additional 3 hr. The reaction was then cooled to rt and the solution was concentrated. The resulting residue was diluted with EtOAc (30ml). The organic solution was then extracted with saturated NaHCO3 (20 ml), water (20 ml) and saturated NaCl (20 ml). The organic solution was dried over MgSO4, filtered and concentrated. The crude product was purified by silica gel column chromatography (4 g silica gel, 20%-50% EtOAc/Hex) to give product (R) -4-(3-(1-(benzyloxy)ethyl)-8-(4-chlorophenyl)-5-((2-methyl-6-(trifluoromethyl)pyridin-3-yl)methyl)-6-oxo-5,6-dihydro-[1,2,4]triazolo[4,3-b]pyridazin-7-yl)benzonitrile as a white solid (40 mg, 44% yield).

Provenance & Evidence