Application of 5775-86-0, These common heterocyclic compound, 5775-86-0, name is 4-Bromo-1,5-dimethylpyrazole, 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.
To a solution of tert-butyl (3S)-3-[[4-[1-(benzenesulfonyl)-6-(4,4,5,5-tetramethyl]-1,3,2-dioxaborolan-2-yl)indol-3-yl]-5-(trifluoromethyl)pyrimidin-2-yl]amino]piperidine-1-carboxylate (120.00 mg, 164.93 umol) and 4-bromo-1,5-dimethyl-pyrazole (31.75 mg, 181.42 umol) in dioxane (5 mL) and H2O (500 uL) was added Pd(PPh3)4 (19.06 mg, 16.49 umol) and Cs2CO3 (107.47 mg, 329.85 umol). The mixture was stirred at 100 C for 4 h under N2. The mixture was poured into water (100 mL). The aqueous phase was extracted with EA (50 mL*3). The combined organic phase was washed with brine (100 mL), dried with anhydrous Na2SO4, filtered and concentrated. The residue was purified by column chromatography (SiO2, Petroleum ether/ethyl acetate=5/1 to 2:1) to give to afford the title compound (150 mg, crude).
Statistics shows that 4-Bromo-1,5-dimethylpyrazole is playing an increasingly important role. we look forward to future research findings about 5775-86-0.