反应详情

599 mg (1.41 mmol) Dess-Martin periodinane is added to a solution of 140 mg (0.471 mmol) 6-(4-tert-butyl-phenyl)-2-hydroxymethyl-5H-pyrazolo[1,5-a]pyrazin-4-one in 5 ml dichloromethane and 1 ml DMF. The reaction mixture is stirred at ambient temperature for 18 hours. The reaction mixture is filtered and the filtrate is washed with saturated sodium thiosulfate solution and with saturated sodium hydrogen carbonate solution. The organic phase is dried over sodium sulfate and evaporated. The residue is triturated with tert-butylmethylether, the solid is filtered off and dried under vacuum to give 6-(4-tert-butyl-phenyl)-4-oxo-4,5-dihydro-pyrazolo[1,5-a]pyrazine-2-carbaldehyde as light yellow crystals; HPLC/MS: 1.93 (C), [M+H] 296.

1. filtrationThe reaction mixture is filtered
2. washthe filtrate is washed with saturated sodium thiosulfate solution and with saturated sodium hydrogen carbonate solution
3. dry with materialThe organic phase is dried over sodium sulfate
4. customevaporated
5. customThe residue is triturated with tert-butylmethylether
6. filtrationthe solid is filtered off
7. customdried under vacuum