反应详情

Methyl 2-[N-(2-hydroxy-1-propyl)aminosulfonyl]-6-nitrobenzoate (2.00g, 628 mmol) was dissolved in 60 ml of methanol. Sodium methoxide (1.0 ml of a 0.1M solution in methanol) was added and the solution cooled and stirred in an ice-bath while a rapid stream of dimethylamine was passed into the vortex for 15 minutes. Stirring in the ice-bath then was continued for 1 hour, when the flash was removed from the bath and the reaction mixture allowed to stand at room temperature overnight. The methanol and excess dimethylamine then were evaporated under reduced pressure and the residue shaken with ethyl acetate, 80 ml; 0.2N HCl, 10 ml; and saturated NaCl, 10 ml. The ethyl acetate layer was separated, extracted with 3×15 ml of saturated NaCl and evaporated to give a clear yellow oil. After drying 23 hours in vacuo, this product weighed 2.03 g. Crystallization had started after 3 days. Recrystallization from a mixture of ethyl acetate and hexane gave 1.33g (63.9%) of product, m.p., 95.5-97°.

1. temperaturethe solution cooled
2. waitthen was continued for 1 hour
3. customwhen the flash was removed from the bath
4. waitto stand at room temperature overnight
5. customThe methanol and excess dimethylamine then were evaporated under reduced pressure
6. customThe ethyl acetate layer was separated
7. extractionextracted with 3×15 ml of saturated NaCl
8. customevaporated
9. customto give a clear yellow oil
10. customAfter drying 23 hours in vacuo
11. customCrystallization
12. waithad started after 3 days
13. customRecrystallization
14. additionfrom a mixture of ethyl acetate and hexane