Synthetic Route of 5203-77-0, In the next few decades, the world population will flourish. As the population grows rapidly and people all over the world use more and more resources, all industries must consider their environmental impact. 5203-77-0, name is 1,3-Dimethyl-1H-pyrazol-5-ol belongs to pyrazoles-derivatives compound, it is a common compound, a new synthetic route is introduced below.
200 mg (0.71 mmol) of 2-methyl-3-methylsulfonyl-4-trifluoromethylbenzoic acid together with 87 mg (0.78 mmol) of 5-hydroxy-1,3-dimethylpyrazole and a catalytic amount of 4-N,N-dimethylaminopyridine were initially charged in 20 ml of dry CH2Cl2, and 163 mg (0.85 mmol) of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride were added. The mixture was stirred at RT for 3 h, and 3 ml of 1 M HCl were then added. After phase separation, the aqueous phase was extracted with CH2Cl2. The organic phases were dried and concentrated. The residue was taken up in 20 ml of acetonitrile and 143 mg (1.42 mmol) of triethylamine, and eight drops of acetone cyanohydrine and a spatula tip of KCN were added. The mixture was stirred at RT for 16 h and concentrated. 15 ml of CH2Cl2 and then 2 ml of 1M HCl were added to the residue. After phase separation, the aqueous phase was extracted with CH2Cl2. The combined organic phases were dried and concentrated. The residue was purified chromatographically. What was isolated were 112.7 mg of pure product.
The synthetic route of 1,3-Dimethyl-1H-pyrazol-5-ol has been constantly updated, and we look forward to future research findings.