Application of 51105-90-9,Some common heterocyclic compound, 51105-90-9, name is Methyl 1H-pyrazole-4-carboxylate, molecular formula is C5H6N2O2, 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.
Step 1: Preparation of Methyl 1-(N,N-dimethylsulfamoyl)-1H-pyrazole-4-carboxylate To a solution of methyl 1H-pyrazole-4-carboxylate (0.3 g, 2.4 mmol) and DBU (0.39 mL, 2.6 mmol) in acetonitrile (12 mL) was slowly added dimethylsulfamoyl chloride (0.27 mL, 2.51 mmol). The reaction mixture was stirred at rt for 1 h and was then concentrated under reduced pressure. The resulting residue was partitioned between water and ethyl acetate. The organic phase was washed with 10% citric acid, water, and brine. The organic phase was dried over MgSO4, filtered, concentrated and purified by silica gel chromatography eluting with a gradient of 5% ethyl acetate in DCM, to provide methyl 1-(N,N-dimethylsulfamoyl)-1H-pyrazole-4-carboxylate (0.54 g), LCMS-ESI (POS.) m/z 310.0 (M+H)+.
These compound has a wide range of applications. It is believed that with the continuous development of the source of the synthetic route Methyl 1H-pyrazole-4-carboxylate, its application will become more common.
Reference:
Patent; AMGEN INC.; CYTOKINETICS, INC.; Ashcraft, Luke; Boezio, Alessandro; Butler, John; Chandra, Aroop; Chuang, Chihyuan; Collibee, Scott E.; Debenedetto, Mikkel; DiMassa, Vincent; Graceffa, Russell; Malinowski, Justin; Moebius, David; Morgan, Bradley P.; Payette, Joshua; Romero, Antonio; St. Jean, JR., David; Vargas, Richard; Yeoman, John; Zhang, Hanmo; (146 pag.)US2019/77793; (2019); A1;,
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