反应详情

To a solution of 3-methyl-3-(2,4,5-trimethyl-3,6-dioxocyclohexa-1,4-dien-1-yl)butanoic acid (1.75 g, 7.46 mmol) and isobutyl chloroformate (1.11 g, 8.12 mmol) in 20 ml of dry THF, N-methyl morphorline (0.82 ml) was added at 0° C. The resultant mixture was stirred for 30 minutes at 0° C., 4-aminobenzylalcohol (1.38 g, 11.2 mmol) added, and the resultant mixture stirred overnight. After removal of the solid by filtration, the compound was directly purified with silica chromatography using heptane and ethyl acetate as eluent to give a yield of 74%. 1H NMR (300 MHz, CD2Cl2) δ 7.40 (d, J=9, 2H), 7.28 (d, J=9, 2H), 7.19 (s, br, 1H, NH), 4.61 (s, 2H, CH2O), 2.99 (s, 2H, CH2), 2.14 (s, 3H, CH3), 1.97 (s, 6H, CH3), 1.55 (s, 3H, CH3), 1.48 (s, 3H, CH3). MS (m/e): 356 (M+).

1. customAfter removal of the solid
2. filtrationby filtration
3. customthe compound was directly purified with silica chromatography
4. customto give a yield of 74%