These common heterocyclic compound, 25016-11-9, name is 1-Methyl-1H-pyrazole-4-carbaldehyde, 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. 25016-11-9
General procedure: To a solution of S2 (50 mg, 0.2 mmol) in 1,2-dichloroethane (DCE, 1 mL) was added aldehyde(1.1 equiv), sodium triacetoxyborohydride (79 mg, 0.5 mmol) and AcOH (25 muL, 0.5 mmol) at roomtemperature. The solution was stirred for 16 h and concentrated. The solution was extracted withethyl acetate (3 mL), washed with citric acid solution, saturated NaHCO3, and concentrated. Theremaining residue was dissolved in THF and chloroacetyl chloride (23.8 muL, 0.3 mmol) was thenadded at 0 C. The solution was warmed to room temperature and stirred for 2 h. The solutionwas concentrated and separated by preparative TLC to afford RS004 analogues.
Chemical properties determine the actual use. Each compound has specific chemical properties and uses. We look forward to more synthetic routes in the future to expand reaction routes of 25016-11-9.