反应详情

Under ice-cooling, 1.87 g of 62% sodium hydride was added to 100 ml of a dimethylformamide (DMF) solution containing 10.00 g of N-benzyloxycarbonylaniline, and the mixture was stirred at room temperature for one hour. Under ice-cooling, to the above mixture was added dropwise 50 ml of a DMF solution containing 10.31 g of ethyl 6-bromohexanoate, and the resulting mixture was stirred at room temperature overnight. DMF was removed under reduced pressure and water was added to the residue. The mixture was extracted with ethyl acetate. The extract was washed and dried, and the solvent was removed under reduced pressure. The residue was dissolved in 160 ml of methanol and 2 g of 10% palladium-carbon (Pd-C) was added to the solution. The mixture was subjected to catalytic reduction at normal temperature under normal pressure for 2 hours. After removing the catalyst by filtration, the filtrate was condensed and the residue was purified by silica gel column chromatography (solvent; hexane:ethyl acetate=4:1) to give 8.13 g of N-ethoxycarbonylpentyl-N-phenylamine (yield; 79%, melting point: 34°-37° C.).

1. temperatureUnder ice-cooling
2. temperatureUnder ice-cooling, to the above mixture
3. stirringthe resulting mixture was stirred at room temperature overnight
4. customDMF was removed under reduced pressure and water
5. additionwas added to the residue
6. extractionThe mixture was extracted with ethyl acetate
7. washThe extract was washed
8. customdried
9. customthe solvent was removed under reduced pressure
10. dissolutionThe residue was dissolved in 160 ml of methanol
11. addition2 g of 10% palladium-carbon (Pd-C) was added to the solution
12. waitThe mixture was subjected to catalytic reduction at normal temperature under normal pressure for 2 hours
13. customAfter removing the catalyst
14. filtrationby filtration
15. customcondensed
16. customthe residue was purified by silica gel column chromatography (solvent; hexane:ethyl acetate=4:1)