Electric Literature of 951626-95-2, The chemical industry reduces the impact on the environment during synthesis 951626-95-2, name is Ethyl 4-oxo-4,5,6,7-tetrahydropyrazolo[1,5-a]pyrazine-2-carboxylate, I believe this compound will play a more active role in future production and life.
A 60%) dispersion of sodium hydride in mineral oils (0.16 g, 4.0 mmol) was added to a stirred solution of 4,5,6, 7-tetrahydro-4-oxo-pyrazolo[l,5-a]pyrazine-2-carboxylic acid ethyl ester (0.7 g, 3.35 mmol) in DMF (14 mL) at 0 C. The mixture was stirred at room temperature for 1 hour and then benzyl bromide (0.48 mL, 4.0 mmol) was added. The mixture was stirred at room temperature for 16 hours, diluted with H20 and extracted with DCM. The organic layer was separated, washed with brine, dried (NaS04), filtered and the solvents evaporated in vacuo. The crude product was purified by flash columnchromatography (silica; AcOEt in DCM 0/100 to 50/50). The desired fractions were collected and the solvents evaporated in vacuo to yield 4,5,6,7-tetrahydro-4-oxo-5-(phenylmethyl)- pyrazolo[l,5-a]pyrazine-2-carboxylic acid ethyl ester (0.83 g, 83% yield) as a white oil. C16H17N3O3 LCMS: Rt 1.79, m/z 300 [M+H]+ (see LCMS Method 1).
In the field of chemistry, the synthetic routes of compounds are constantly being developed and updated. I will also mention this compound in other articles, Ethyl 4-oxo-4,5,6,7-tetrahydropyrazolo[1,5-a]pyrazine-2-carboxylate, other downstream synthetic routes, hurry up and to see.