反应详情

N,N'-dicyclohexylcarbodiimide (1.95 g, 0.009 mol), was added in one portion to a stirred solution of compound 2 (1.67 g, 0.008 mol), compound 3 (1.59 g, 0.009 mol) and 4-(N-pyrrolidino)pyridine (0.39 g, 0.003 mol) in dry dichloromethane (50 ml) at room temperature. The reaction mixture was stirred at room temperature overnight. The product was extracted into ether (200 ml) and was washed with aqueous potassium hydroxide solution (5%, 2×250 ml). The ether layer was evaporated in vacuo and the product was purified by column chromatography [silica gel/petroleum fraction (bp 40°-60° C.), dichloromethane, 1:1] and was recrystallised from cyclohexane to afford a white solid which was dried in vacuo.

1. extractionThe product was extracted into ether (200 ml)
2. washwas washed with aqueous potassium hydroxide solution (5%, 2×250 ml)
3. customThe ether layer was evaporated in vacuo
4. customthe product was purified by column chromatography [silica gel/petroleum fraction (bp 40°-60° C.), dichloromethane, 1:1]
5. customwas recrystallised from cyclohexane
6. customto afford a white solid which
7. customwas dried in vacuo