Reference of 1209646-17-2, A common heterocyclic compound, 1209646-17-2, name is 5-(4-(tert-Butoxycarbonyl)piperazin-1-yl)pyrazine-2-carboxylic acid, molecular formula is C14H20N4O4, 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 suspension of I-77 (3.0 g, 9.71 mmol) in THF (40 ml) is added 1,1?-carbonyldiimidazole (1.6 g, 9.71 mmol) at room temperature. The mixture is stirred at 50 C. for 30 minutes. After this time I-16 (2.5 g, 8.83 mmol) is added and the resulting mixture is heated at 80 C. for 3 hours. The mixture is cooled down and treated with AcOH (8 ml). The mixture is warmed to 80 C. and stirred over night. Upon cooling to room temperature, the reaction is concentrated and diluted with water. The product is extracted into DCM (2×). The combined organics are washed with brine and dried over anhydrous MgSO4. The mixture is filtered and concentrated. The remaining crude is purified via flash chromatography (silica gel, 0-5% MeOH/DCM) to afford I-78 (2.2 g). In a microwave reaction vessel is added I-78 (0.50 g, 0.90 mmol) in 15 ml of DMF, followed by the addition of 2-aminopyrimidine-5-boronic acid pinacol ester (0.30 g, 1.35 mmol), tetrakis(triphenylphosphine)palladium(0) (105 mg, 0.09 mmol) and aq. Na2CO3 (2.0M, 1.8 ml). The reaction mixture is stirred at 85 C. for 16 hours. After this time the reaction mixture is poured into brine and extracted with EtOAc (3×). The combined organic fractions are dried over anhydrous MgSO4, filtered, then concentrated in vacuo to give the crude material. Purification via flash chromatography (silica gel, 0-5% MeOH/DCM) affords the title intermediate (150 mg); m/z 570.4 [M+H]
The synthetic route of 1209646-17-2 has been constantly updated, and we look forward to future research findings.
Reference:
Patent; Boehringer Ingelheim International GmbH; BYLOCK, Lars Anders; US2013/195879; (2013); A1;,
Pyrazine – Wikipedia,
Pyrazine | C4H4N2 – PubChem