反应详情

5-(2-Formyl-3-hydroxyphenoxy)pentanoic acid (595 mg, 2.5 mM) was dissolved in dry dichloromethane (7.5 ml) under nitrogen with stirring, and immersed in a cooling bath kept at -10° C. To this solution was added dropwise from a syringe triethylamine (0.35 ml, 2.5 mM). After 5 minutes was then similarly added ethyl chloroformate (0.25 ml, 2.5 mM). After 15 minutes was then similarly added isopropylamine (0.215 ml, 2.5 mM). The reaction mixture was allowed to warm to room temperature and then stirred at room temperature (1/2 hr). After diluting with ether (50 ml) and 1 N hydrochloric acid the aqueous phase was removed and the organic phase washed with dilute sodium bicarbonate solution and then quickly extracted with 2 N sodium hydroxide solution (1×25 ml). The layers were separated and the aqueous phase immediately acidified with dilute hydrochloric acid and extracted with ether/ethyl acetate. The combined extracts were washed with dilute sodium bicarbonate solution, water, dried (sodium sulphate) and evaporated to give N-isopropyl 5-(2-formyl-3-hydroxyphenoxy)pentanamide, m.p. 92°-93° C. from ethyl acetate/petrol.

1. customimmersed in a cooling bath
2. customkept at -10° C
3. waitAfter 15 minutes was
4. stirringstirred at room temperature (1/2 hr)
5. customwas removed
6. washthe organic phase washed with dilute sodium bicarbonate solution
7. extractionquickly extracted with 2 N sodium hydroxide solution (1×25 ml)
8. customThe layers were separated
9. extractionextracted with ether/ethyl acetate
10. washThe combined extracts were washed with dilute sodium bicarbonate solution, water
11. dry with materialdried (sodium sulphate)
12. customevaporated