Related Products of 1280210-79-8, Each compound has different characteristics, and only by selecting the characteristics of the compound suitable for a specific situation can the compound be applied on a large scale. 1280210-79-8, name is tert-Butyl 4,6-dihydropyrrolo[3,4-c]pyrazole-5(2H)-carboxylate, This compound has unique chemical properties. The synthetic route is as follows.
To a stirred solution of feri-butyl 2,6-dihydropyriOlo[3,4-c]pyrazole-5(4H)- carboxylate (Step A of Intermediate 7) (35 g, 167 mmol) in DMF (500 mL) at 0 C under N2 was added sodium hexamethyldisilazide in THF (351 mL, 351 mmol) and the mixture was stirred at 0 C for 30 min. Isobutylene oxide (74.3 mL, 836 mmol) was then slowly added. The solution was stirred at 0C for 0.5 h and then stirred at room temperature for 1 h. The solution was heated to 80C for 100 min in a microwave oven, cooled to room temperature and evapoarted under vacuum. The residue was purified by column chromatography on silica gel, eluting with a gradient of 0% to 6% CH2Cl2 MeOH (containing 10% NH4OH) to give a mixture of two regioisomers. The mixture of two regioisomers A and B was resolved by chromatography on a ChiralPak AD-H column eluting with 4-40% MeOH/C02 to give isomer A as the faster eluting isomer and isomer B as the slower eluting isomer. NMR (500 MHz, CD3OD) for isomer B: 57.42 (d, 1H); 4.42 (s, 2H); 4.41 (s, 2H); 4.07 (s, 2H); 1.51 (d, 9H); 1.16 (s, 6H). LC-MS: 226.27 (M+l -56).The desired isomer B was treated with 1 : 1 TF A/CH2CI2 for 1 h to give the title compound. NMR (500 MHz, CD3OD): 67.55 (s, 1H); 4.43 (s, 2H); 4.39 (s, 2H); 4.10 (s, 2H); 1.17 (s, 6H). LC-MS: 182.31 (M+l).
The chemical industry reduces the impact on the environment during synthesis tert-Butyl 4,6-dihydropyrrolo[3,4-c]pyrazole-5(2H)-carboxylate. I believe this compound will play a more active role in future production and life.
Reference:
Patent; MERCK SHARP & DOHME CORP.; HICKS, Jacqueline, D.; BIFTU, Tesfaye; CHEN, Ping; QIAN, Xiaoxia; WILKENING, Robert, R.; WO2011/146358; (2011); A1;,
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