Ammonium Chloride → HCID 86724101, compound

Participants

Reaction Conditions

Reaction Steps

To a mixture of 2-(1-methyl-5-nitro-1H-pyrazol-3-yl)-1,3,4-oxadiazole (2.56 g, 13.1 mmol), ammonium chloride (4.91 g, 92 mmol) in a 1:1 solution of THF/MeOH (82.6 mL) at about 0° C. was added zinc dust (6.0 g, 92 mmol) portionwise. The reaction was stirred for about 10 min at about 0° C. The ice bath was removed and the reaction stirred at ambient temperature for about 16 h. The reaction mixture was filtered through a pad of Celite® rinsing with MeOH (50 mL). The filtrate was concentrated under reduced pressure. The material was partitioned between DCM (50 mL) and water (10 mL). The aqueous layer was back extracted with DCM (2×50 mL). The combined organic layers were dried over MgSO4, filtered and concentrated under reduced pressure. The aqueous layer was acidified using 1 N HCl to about pH 3 and back extracted with DCM (50 mL). The organic layer was dried over MgSO4, filtered and concentrated under reduced pressure. The organic layer batches were combined to afford 1-methyl-3-(1,3,4-oxadiazol-2-yl)-1H-pyrazol-5-amine (0.67 g, 4.06 mmol, 31%, which was used without further purification). LC-MS (Table 1, Method g) Rt=0.59 min, m/z 166 (M+H)+.

Provenance & Evidence