反应详情

A mixture of 3.92 parts of 1-(2-chloroethyl)-1,3-dihydro-2H-benzimidazol-2-one, 5.4 parts of 1-(4-methoxyphenyl)-2-(4-piperidinyl)ethanone hydrochloride, 5.3 parts of sodium carbonate, 0.1 parts of potassium iodide and 200 parts of 4-methyl-2-pentanone is distilled azeotropically to dry overnight. After cooling, the precipitated product is filtered off, washed with water and dissolved in trichloromethane. The latter is dried, filtered and evaporated. The residue is crystallized from 2-propanol, yielding 2.9 parts (36.5%) of 1,3-dihydro-1-[2-[4-[2-(4-methoxyphenyl)-2-oxoethyl]-1-piperidinyl]ethyl]-2H-benzimidazol-2-one; mp. 155.9° C.

1. distillationis distilled azeotropically
2. customto dry overnight
3. temperatureAfter cooling
4. filtrationthe precipitated product is filtered off
5. washwashed with water
6. dissolutiondissolved in trichloromethane
7. customThe latter is dried
8. filtrationfiltered
9. customevaporated
10. customThe residue is crystallized from 2-propanol