反应详情

4-Bromo-N-(2,2,2-trichloro-1-hydroxyethyl)furan-2-carboxamide 125 (0.16 g, 0.47 mmol) and isocyanatocyclooctane (0.08 mL, 0.51 mmol) in benzene (2 mL) with triethyl amine (2 drops) was heated to 95° C. for 1.5 hours. The mixture was concentrated onto silica gel and purified by chromatography (7:3 to 6:4 hexane:CH2Cl2) to give 4-bromo-N-(2,2,2-trichloro-1-(cyclooctylamino)ethyl)furan-2-carboxamide (Compound-51) (142 mg, 67%). 1H NMR (300 MHz, CDCl3): δ=7.50 (d, J=0.9 Hz, 1H), 7.21 (d, J=0.9 Hz, 1H), 6.59 (d, J=9.6 Hz, 1H), 5.55 (t, J=9.3 Hz, 1H), 2.96-2.85 (m, 1H), 1.79-1.42 (m, 15H).

1. concentrationThe mixture was concentrated onto silica gel
2. custompurified by chromatography (7:3 to 6:4 hexane:CH2Cl2)