Electric Literature of 1280210-79-8, As we all know, there are many different methods for the synthesis of a compound, and people can choose the synthesis method that suits their own laboratory according to the actual situation. 1280210-79-8 name is tert-Butyl 4,6-dihydropyrrolo[3,4-c]pyrazole-5(2H)-carboxylate, This compound is widely used in many fields, so it is necessary to find a new synthetic route. The downstream synthesis method of this compound is introduced below.
Synthesis of 257-B and 258-B. To a solution of 257-A and 258-A (270 mg, 1.21 mmol) in DCM (6 mL) was added TFA (2 mL) dropwise under ice bath. Then the solution was stirred at room temperature 1 h. The solvent was removed in vacuo to give 257-B and 258-B as a crude product.Synthesis of 257-C and 258-C. A mixture of 257-B and 258-B (crude product from last step) and 143-C (286 mg, 0.61 mmol) in acetonitrile (10 mL) was stirred at 50 oC for 30 min, then Na2CO3 (581 mg, 6.05 mmol) was added into above mixture and stirred at 50 oC for 1 h. The mixture was cooled to room temperature. Na2CO3 was removed by filtered, the filtrate was concentrated in vacuo. The residue was purified by column chromatography on silica gel (DCM : MeOH = 200 : 1) to give 257-C (100 mg, 44%) as a yellow solid and 258-C (50 mg, 22%) as a yellow solid.
At the same time, in my other blogs, there are other synthetic methods of this type of compound, tert-Butyl 4,6-dihydropyrrolo[3,4-c]pyrazole-5(2H)-carboxylate, and friends who are interested can also refer to it.