反应详情

Triethylamine (5.6 ml; 0.04 moles) and ethyl chloroformate (3.84 ml; 0.04 moles) were added successively to a stirred suspension of 2-ethoxy-4-amino5-chlorobenzoic acid (8.6 g; 0.04 moles) in anhydrous tetrahydrofuran (300 ml) whilst maintaining the temperature between -5° and -10° C. After stirring at this temperature for 0.5 hours, a solution of 1-(2-tetrahydrofurylmethyl)-4-aminopiperidine (8.0 g; 0.04 moles) in anhydrous tetrahydrofuran (50 ml) was added, the temperature was maintained at -5° to -10° C. for 1 hour and then allowed overnight to reach room temperature. The solvent of the mixture was removed in vacuo, the residue poured into water, extracted with chloroform and the organic layers washed with water. The chloroformic solution was dried (Na2SO4) and the solvent removed in vacuo to give an oil which was treated with the stoichiometric amount of fumaric acid in boiling absolute ethanol. N-[1-(2-Tetrahydrofurylmethyl)-piperid-4-yl]-2-ethoxy-4-amino-5-chlorobenzamide hydrogen fumarate (10.6 g) was thus obtained, m.p. 199°-201° C. (d).

1. temperaturewhilst maintaining the temperature between -5° and -10° C
2. temperaturethe temperature was maintained at -5° to -10° C. for 1 hour
3. waitallowed overnight
4. customto reach room temperature
5. customThe solvent of the mixture was removed in vacuo
6. additionthe residue poured into water
7. extractionextracted with chloroform
8. washthe organic layers washed with water
9. dry with materialThe chloroformic solution was dried (Na2SO4)
10. customthe solvent removed in vacuo
11. customto give an oil which