反应详情

7.71 g. of 1-(2,4-dichlorophenyl)-2-(1H-imidazol-1-yl)-ethanol (0.03 mol.) and 6.9 g. of 4-chloro-5-chloromethyl-1-ethyl-1H-pyrazolo[3,4-b]pyridine (0.03 mol.) are reacted according to the procedure of Example 1b. The combined tetrahydrofuran layers are treated with charcoal and filtered. Addition of 250 ml. of ether to the tetrahydrofuran solution separates an oily impurity which is removed by decanting the solution. After the solution containing the free base is cleared up by the addition of Hyflo filter aid there is added an excess of ethereal hydrochloric acid. The precipitated hydrochloride is allowed to stand for 2 hours, then filtered off, washed with ether and dried in a vacuum desiccator, yield: 8.3 g. (61%). The product is recrystallized from 3 N-hydrochloric acid with charcoal. The so obtained 4-chloro-5-[[1-(2,4-dichlorophenyl)-2-(1H-imidazol-1-yl)ethoxy]methyl]-1-ethyl-1H-pyrazolo[3,4-b]-pyridine, hydrochloride (1:1) contains half a mole of water; m.p. 166°-167°.

1. filtrationfiltered
2. additionAddition of 250 ml
3. customis removed
4. customby decanting the solution
5. additionAfter the solution containing the free base
6. additionis cleared up by the addition of Hyflo
7. filtrationfilter aid
8. additionthere is added an excess of ethereal hydrochloric acid
9. filtrationfiltered off
10. washwashed with ether
11. customdried in a vacuum desiccator, yield: 8.3 g
12. customThe product is recrystallized from 3 N-hydrochloric acid with charcoal