反应详情

A mixture of Example 1D (11.6 g, 40 mmol) and dimethyl sulfate (20.2 g, 160 mmol) in toluene (10 mL) was heated at 80° C. for 24 hours. The mixture was cooled to room temperature and concentrated. The residue was purified by column chromatography using an Analogix® Intelliflash280™ (SiO2, eluted with a gradient of 15-100% hexane in solvent B, solvent B: 10:1:0.5 ethyl acetate:methanol:triethylamine) to afford the title compound (8.7 g, 72% yield). 1H NMR (300 MHz, DMSO-d6) δ ppm 0.41-0.53 (m, 4 H), 1.15-1.27 (m, 1 H), 1.38 (s, 9 H), 3.98 (s, 3 H), 4.20 (d, J=7.12 Hz, 2 H), 6.70 (s, 1 H); MS (ESI) m/z 304 [M+H]+.

1. concentrationconcentrated
2. customThe residue was purified by column chromatography
3. washeluted with a gradient of 15-100% hexane in solvent B, solvent B