Reference of 360056-45-7, These common heterocyclic compound, 360056-45-7, name is Methyl 4-amino-1H-pyrazole-3-carboxylate, its traditional synthetic route has been very mature, but the traditional synthetic route has various shortcomings, such as complicated route, low yield, poor purity, etc, below Introduce a new synthetic route.
2,6-dichlorobenzoyl chloride (8.2 g; 39.05 mmol) was added cautiously to a solution of 4- amino-1 H-pyrazole-3-carboxylic acid methyl ester (5 g; 35.5 mmol) and triethylamine (5.95 ml; 42.6 mmol) in dioxane (50 ml) then stirred at room temperature for 5 hours. The reaction mixture was filtered and the filtrate treated with methanol (50 ml) and 2M sodium hydroxide solution (100 ml), heated at 50 0C for 4 hours, and then evaporated. 100 ml of water was added to the residue then acidified with concentrated hydrochloric acid. The solid was collected by filtration, washed with water (100 ml) and sucked dry to give 10.05 g of 4-(2,6-dichloro-benzoylamino)-1 H-pyrazole-3-carboxylic acid as a pale violet solid. (LC/MS: Rt 2.26, [M+H]+ 300 / 302).
The synthetic route of 360056-45-7 has been constantly updated, and we look forward to future research findings.