Some common heterocyclic compound, 128694-63-3, name is 1-Methyl-3-(trifluoromethyl)-1H-pyrazole-5-carboxylic acid, molecular formula is C6H5F3N2O2, 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. SDS of cas: 128694-63-3
BB4; 5-(chloromethyl)-l-methyl-3-(trifluoromethyl)-lH-pyrazoleBB4a BB4b BB4Step A: l-Methyl-3-(trifluoromethyl)-lH-pyrazole-5-carboxylic acid BB4a (837 mg, 4.3 mmol) is dissolved in anhydrous tetrahydrofurane (10 mL), then LiAlH4 (2.16 mL of 2.0 M in tetrahydrofurane, 4.3 mmol) is added dropwise and stirred at rt for lh. The mixture is quenched by dropwise addition of IN HC1, then is made basic by addition of saturated NaHC03 and extracted with EtOAc (3x). The organic layers are combined, washed with brine, dried (MgS04), filtered and concentrated to provide (l-methyl-3-(trifluoromethyl)- lH-pyrazol-5-yl)methanol BB4b as a clear oil. 1H NMR (400 MHz, CDC13) delta = 6.46 (s, 1H), 4.69 (d, J = 5.6 Hz, 2H), 3.95 (s, 3H); MS calcd. for C6H8F3N20 ([M+H]+): 181.0, found: 181.1.
These compound has a wide range of applications. It is believed that with the continuous development of the source of the synthetic route 128694-63-3, its application will become more common.