反应详情

To a solution of 5-cyclohex-1-enyl-3-[(trans-4-hydroxy-cyclohexyl)-(trans-4-methyl-cyclohexanecarbonyl)-amino]-thiophene-2-carboxylic acid methyl ester (25 mg, 0.054 mmol) in DMSO (0.2 mL) was added a mixture of acetic acid and acetic anhydride (1:5.6) (0.17 mL). After stirring for 1.5 h at room temperature it was held at 40° C. for 5 h. It was cooled to room temperature and stirred for 16 h. The mixture was cooled in ice-bath and NaHCO3 solution was added carefully. It was extracted with ether. The extract was washed with water and brine, dried over MgSO4 and evaporated. Pure 5-cyclohex-1-enyl-3-[(trans-4-methyl-cyclohexanecarbonyl)-(trans-4-methylsulfanylmethoxy-cyclohexyl)-amino]-thiophene-2-carboxylic acid methyl ester was obtained by chromatography over silica gel (hexane:EtOAc=−4:1) (22 mg, 77%).

1. waitwas held at 40° C. for 5 h
2. temperatureIt was cooled to room temperature
3. stirringstirred for 16 h
4. temperatureThe mixture was cooled in ice-bath
5. extractionIt was extracted with ether
6. washThe extract was washed with water and brine
7. dry with materialdried over MgSO4
8. customevaporated