Hydrochloric Acid → HCID 136398806, compound

Participants

Reaction Steps

5-Amino-4-cyano-1-methyl-3-(3-methylbutanoylamino)pyrazole (10 g), prepared as in Example 27 was heated with 1 M sodium hydroxide solution (90 ml) for 2 hours. The solution was adjusted to pH=7 with concentrated hydrochloric acid, and was evaporated to dryness. The residue was extracted with acetone containing 5% water (100 ml). The extracts were evaporated, and the residue was dissolved in a minimum of hot ethanol. Then the solution was cooled and a precipitate which formed was filtered off. The filtrate was mixed with concentrate hydrochloric acid (5 ml) and the precipitate was recrystallised from water to give the title compound, m.p. 292°-294° C. decomp.

Provenance & Evidence