反应详情

252 mg of 2-[3-(5-hydroxypyrimidin-2-yl)benzyl]-6-(1-methyl-1H-pyrazol-4-yl)-2H-pyridazin-3-one (0.7 mmol) are suspended in abs. THF under a protective-gas atmosphere in a 25 ml three-necked flask, 0.19 ml of 2-(tetrahydropyran-2-yloxy)ethanol (1.4 mmol) and 367 mg of triphenylphosphine (1.4 mmol) are added, and the mixture is stirred at RT for 30 min. 275 μl of diisopropyl azodicarboxylate (1.4 mmol) are subsequently added dropwise, and the reaction mixture is stirred at RT for a further 2 h. For work-up, the reaction mixture is diluted with 20 ml of dichloromethane, washed with 10 ml of water, dried over sodium sulfate, evaporated to dryness and purified by chromatography. (silica gel: MTB ether->DCM->DCM: 30% of MeOH). The THP-protected product is stirred at RT for 20 h in 5 ml of 4 N HCl in dioxane. The reaction solution is evaporated to dryness and crystallised from methanol/diethyl ether, giving “A294”; ESI 405; m.p. 182-3° C.

1. stirringthe reaction mixture is stirred at RT for a further 2 h
2. washwashed with 10 ml of water
3. dry with materialdried over sodium sulfate
4. customevaporated to dryness
5. custompurified by chromatography
6. stirringThe THP-protected product is stirred at RT for 20 h in 5 ml of 4 N HCl in dioxane
7. customThe reaction solution is evaporated to dryness
8. customcrystallised from methanol/diethyl ether
9. customgiving “A294”