反应详情

Part A. A suspension of 4,5-bis(4-methoxyphenyl)-2-mercapto-1H-imidazole (10.4 g, 33.2 mmol), ethyl 5-bromovalerate (5.00 mL, 31.6 mmol), potassium carbonate (5.50 g, 39.8 mmol), and tetra-n-butylammonium iodide (2 g) in tetrahydrofuran (100 mL) was heated to reflux for 20 hours. The mixture was cooled, and poured into water (400 mL). This was extracted with methylene chloride (2 ×400 mL), and the extracts were combined, dried over anhydrous magnesium sulfate, filtered and evaporated. The residual oil was purified by elution through a short plug of silica gel with ethyl acetate, and evaporation afforded ethyl 5-[4,5-bis(4-methoxyphenyl)-1H-imidazole-2-ylthio]pentanoate (14.4 g, 32.6 mmol, 98%) as a waxy, low-melting solid.

1. temperaturewas heated
2. temperatureto reflux for 20 hours
3. temperatureThe mixture was cooled
4. extractionThis was extracted with methylene chloride (2 ×400 mL)
5. dry with materialdried over anhydrous magnesium sulfate
6. filtrationfiltered
7. customevaporated
8. customThe residual oil was purified by elution through a short plug of silica gel with ethyl acetate, and evaporation