反应详情

Sixty percent sodium hydride suspension in oil (0.422 g, 10.55 mmol) was washed with tetrahydrofuran and was added to tetrahydrofuran (175 mL). To this was added 2-[hydroxy-(7-methoxy-benzo[1,3]dioxol-5-yl)-methyl]-N-o-tolyl-benzenesulfonamide (4.1 g, 9.59 mmol). After stirring for 30 minutes, methyl bromoacetate (1.09 mL, 11.5 mmol) was added followed by stirring at reflux for 18 hours. The mixture was evaporated to an oil in vacuo, and the residue was resuspended in ethyl ether, washed with 1N citric and brine. The solution was dried over anhydrous magnesium sulfate, filtered, and evaporated to a solid. The material was chromatographed on 300 g silica gel eluted with a mixture of ethyl acetate and hexane (35:65). The appropriate fractions were concentrated in vacuo from ethyl ether giving a solid, 4.29 g, 89.5% yield. NMR spectra and elemental analysis were consistent with the structure.

1. stirringby stirring
2. temperatureat reflux for 18 hours
3. customThe mixture was evaporated to an oil in vacuo
4. washwashed with 1N citric
5. dry with materialThe solution was dried over anhydrous magnesium sulfate
6. filtrationfiltered
7. customevaporated to a solid
8. customThe material was chromatographed on 300 g silica gel
9. washeluted with a mixture of ethyl acetate and hexane (35:65)
10. concentrationThe appropriate fractions were concentrated in vacuo from ethyl ether giving a solid, 4.29 g, 89.5% yield