Phosphorus oxychloride → HCID 86639822, compound

Participants

Reaction Steps

6-Bromo-3-((-(6-chloropyridazin-3-yl)ethyl)-[1,2,4]triazolo[4,3-a]pyridine (48D): A solution of N′-(5-bromopyridin-2-yl)-2-(6-chloropyridazin-3-yl)propanehydrazide (13 g, 36.5 mmol) in phosphoryl trichloride (84 ml, 901 mmol) was heated in the microwave at 140° C. for 15 min. The reaction was concentrated via rotary evaporation and the resulting mixture was added drop-wise to a mixture of EtOAc:Saturated Bicarbonate (aq) (4:6, 1 L). The organic phase was separated and the aqueous phase was extracted with EtOAc (3×75 mL). The EtOAc solutions were combined and evaporated to dryness. The resulting residue was purified by MPLC (DCM:MeOH, 97:3) to provide the title compound, 6-Bromo-3-(1-(6-chloropyridazin-3-yl)ethyl)-[1,2,4]triazolo[4,3-a]pyridine (48D, 3.3 g, 26.7%). 1H NMR (400 MHz, DMSO-d6) δ ppm 1.86 (d, J=7.07 Hz, 3 H) 5.27 (d, J=7.33 Hz, 1 H) 7.49 (dd, J=9.60, 1.77 Hz, 1H) 7.78 (dd, J=9.85, 1.01 Hz, 1 H) 7.94 (s, 2 H) 8.79 (s, 1 H). ESI-MS:m/z 339.1 (M+H)+.

Provenance & Evidence