反应详情

温度

210 °C

In the manner described in Example 45, a mixture of 1.80 g (12.68 mmol) phosphorus pentoxide, 1.73 g (12.6 mmol) triethylamine hydrochloride, 1,9 ml (12.5 mmol) 4-tertbutylaniline, and 1 g (4.2 mmol) 4-(4-pyridylmethyl)-1(2H)-phthalazinone is stirred for 4.5 h at 210° C. The frozen melt is then dissolved in dichloromethane using an ultrasonic bath, filtered off from undissolved components, and the filtrate evaporated in the RE. The oil-like residue is distributed between dichloromethane and a mixture of 20 ml water and 5 ml conc. ammonia, and the organic phase dried over anhydrous sodium sulfate, filtered and evaporated under vacuum. The residue is then stirred with 10 ml acetonitrile, filtered off from some non-transformed 4-(4-pyridylmethyl)-1(2H)-phthalazinone, and the filtrate evaporated under vacuum. Flash chromatography of the residue on silica gel with a particle size of 0.04-0.06 mm using a toluene/acetone mixture (7:3) yields a resin (free base of the title compound), which is dissolved in a mixture of 4 ml methanol and 1.5 ml of 3 N methanolic HCl. After evaporation under vacuum, recrystallization of the residue from methanol/ether, drying under HV (6 h, 80° C.), and equilibration for 16 h at 20° C. and in room atmosphere, title compound is obtained with a water content of 4.47%; m.p. 196-200° C.; ESI-MS: (M+H)+=369.

1. filtrationfiltered off from undissolved components
2. customthe filtrate evaporated in the RE
3. additiona mixture of 20 ml water and 5 ml conc. ammonia
4. dry with materialthe organic phase dried over anhydrous sodium sulfate
5. filtrationfiltered
6. customevaporated under vacuum
7. stirringThe residue is then stirred with 10 ml acetonitrile
8. filtrationfiltered off from some non-transformed 4-(4-pyridylmethyl)-1(2H)-phthalazinone
9. customthe filtrate evaporated under vacuum