反应详情

温度

40 °C

N,N-Diisopropylethylamine(199 μl) and cyclohexyl isocyanate (128 μl) were added to a stirred solution of 4-(2,4-bis{[tert-butyl(dimethyl)silyl]oxy}phenyl)cyclohexanol (50 mg) in dry dichloroethane (1 ml) at room temperature under argon. The reaction mixture was heated to 40° C. for 120 h, and was partitioned between water (50 ml) and ethyl acetate (50 ml). The layers were separated and the aqueous layer was extracted with ethyl acetate (2×50 ml). The combined organic extracts were dried over magnesium sulfate and evaporated in vacuo. The residue was purified by flash column chromatography (SiO2, ethyl acetate/petrol, 1:2 v/v) to give the title compound as a pale yellow solid (30 mg, 47%); δH (CDCl3) 0.12 (6H, s), 0.18 (6H, s), 0.90 (9H, s), 0.95 (9H, s). 1.00-2.10 (18H, m), 2.70-2.80 (1H, m), 3.36-3.50 (1H, m), 4.40-4.48 (1H, m), 4.50-4.62 (1H, m), 6.20 (1H, d), 6.32 (1H, dd), 6.86 (1H, d).

1. customwas partitioned between water (50 ml) and ethyl acetate (50 ml)
2. customThe layers were separated
3. extractionthe aqueous layer was extracted with ethyl acetate (2×50 ml)
4. dry with materialThe combined organic extracts were dried over magnesium sulfate
5. customevaporated in vacuo
6. customThe residue was purified by flash column chromatography (SiO2, ethyl acetate/petrol, 1:2 v/v)