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. 402-61-9, name is 5-Methyl-1H-pyrazole-3-carboxylic acid belongs to pyrazoles-derivatives compound, it is a common compound, a new synthetic route is introduced below. COA of Formula: C5H6N2O2
General procedure: To a solution of 5-methyl-1H-pyrazole-3-carboxylic acid (19; 1.1-3.3 equiv) in DMF (5 mL) were added EDCI·HCl (1.1-3.3 equiv), HOBt·H2O (1.1-3.3 equiv) and DIPEA (1.1-3.3 equiv) at 0 C and the resulting mixture was stirred at this temperature for 30 min. The corresponding derivative bearing one to three amino groups (17, 25-28 or 36; 1 equiv), dissolved in DMF (1 mL), was added and the reaction mixture was stirred for 48 h at r.t. After this time, the reaction mixture was poured into ice-water (30 mL) and the formed precipitate was filtered off and washed thoroughly with small amounts of distilled H2O to free it from DMF. After drying in a dessicator, the desired products were obtained as white solids.
The synthetic route of 402-61-9 has been constantly updated, and we look forward to future research findings.