反应详情

27 mg of sodium borohydride are added to a mixture of 179 mg of 1-{6-[(6-ethoxy[1,2,4]triazolo[4,3-b]pyridazin-3-yl)sulphanyl]-1,3-benzothiazol-2-yl}-3-[2-(morpholin-4-yl)ethyl]urea in 10 cm3 of ethanol. The reaction is refluxed for 3.5 h, and then 108 mg of sodium borohydride are added gradually and the reflux is maintained for 48 h. The reaction mixture is concentrated to dryness under reduced pressure. The residue is purified by chromatography on Biotage Quad 12/25 (KP-SIL, 60 A; 32-63 mM), elution being carried out with a dichloromethane/methanol gradient of 99/1 to 93/7. 72 mg of 1-{6-[(6-ethoxy-7,8-dihydro[1,2,4]triazolo[4,3-b]pyridazin-3-yl)sulphanyl]-1,3-benzothiazol-2-yl}-3-[2-(morpholin-4-yl)ethyl]urea are thus obtained in the form of a white powder, the characteristics of which are as follows:

1. temperatureThe reaction is refluxed for 3.5 h
2. temperaturethe reflux is maintained for 48 h
3. concentrationThe reaction mixture is concentrated to dryness under reduced pressure
4. customThe residue is purified by chromatography on Biotage Quad 12/25 (KP-SIL, 60 A
5. wash32-63 mM), elution