反应详情

To a solution of capsaicin (0.7 g, 2.3 mmol) and (−)-menthyl chloroformate (0.5 g, 2.3 mmol) in anhydrous dichloromethane (10 mL) was added triethylamine (0.45 g, 4.5 mmol) dropwise at ambient temperature. After the addition, the reaction mixture was stirred at ambient temperature for 2 hours. The reaction mixture was diluted with dichloromethane (DCM), washed with 5% aqueous K2CO3 solution, brine, dried over MgSO4, concentrated to dryness. The obtained crude product was purified through silica gel column chromatography (30% -50% ethyl acetate in hexane as the eluent) to give 0.98 g of capsaicin l-menthol mutual prodrug (87% yield) as clear viscous oil. 1H-NMR and 13C-NMR of the obtained capsaicin l-menthol mutual prodrug were consistent with the desired structure (see FIGS. 34, 35). Mass spectral analysis of the product was consistent with the desired structure (FIG. 36).

1. additionAfter the addition
2. washwashed with 5% aqueous K2CO3 solution, brine
3. dry with materialdried over MgSO4
4. concentrationconcentrated to dryness
5. customThe obtained crude product
6. customwas purified through silica gel column chromatography (30% -50% ethyl acetate in hexane as the eluent)