反应详情

A mixture of N-(diphenylaminocarbonyl)nicotinamide (1.6 g., 0.005 mole), toluene (50 ml.), piperidine (1.28 g., 0.015 mole) and glacial acetic acid (0.86 ml.) is heated and stirred at 95°-97° C. for one hour. The mixture is cooled to room temperature and extracted with 1 N sodium hydroxide (50 ml.). The extract is acidified with glacial acetic acid and the oil which separates extracted with ethyl acetate. Evaporation of the extract under reduced pressure gives 1.9 g. of oil. The oil is taken up in ether (20 ml.), the solution made acid with ethyl acetate-HCl and then diluted with an equal volume of hexane to precipitate a gum. Trituration of the gum with acetone (10 ml.) affords the crystalline product; m.p. 162°-164° C.

1. temperatureis heated
2. extractionextracted with 1 N sodium hydroxide (50 ml.)
3. extractionthe oil which separates extracted with ethyl acetate
4. customEvaporation of the
5. extractionextract under reduced pressure
6. customgives 1.9 g
7. customto precipitate a gum
8. customTrituration of the gum with acetone (10 ml.) affords the crystalline product