Hydrochloric Acid → HCID 19990248, compound

Participants

Reaction Steps

500 mg (1.62 mmoles) of 1-benzyl-3-benzylamino-4-nitropyrazol (Example 1, Step I, Fraction 1) are hydrated in 20 ml 5-normal methanolic hydrochloric acid with catalytic quantities of palladium/carbon at room temperature and 50 bar. After 17 hours, the hydration is concluded and hydrogen chloride gas is guided through the solution for 5 minutes. The solution is reduced in the rotary evaporator in a vacuum to half of the original volume and then mixed with acetic acid until a colorless precipitate is formed which is recrystallized from acetic acid/methanol.

Provenance & Evidence