反应详情

温度

50 °C

Compound 494 (0.03 g, 0.08 mmol) was dissolved in 1,4-dioxan (0.5 mL) and n-butyl isocyanate (0.014 mL, 0.12 mmol) was added. The solution was stirred at 50° C. for 18 h. Work up as described in the preparation of compound 259. The crude product was purified by flash chromatography using a gradient of EtOAc/petroleum ether (40-60) 15:85→60:40 as the eluent. This afforded the title compound as a slightly coloured solid. 13C NMR (CD3OD) δ 198.5, 161.0 (dd), 158.3, 157.9 (dd), 151.1, 141.0, 138.9, 136.1, 135.0, 132.7, 132.1, 128.9, 127.4 (dd), 126.0 (dd), 122.5, 120.9, 116.6, 112.9, 112.6 (dd), 105.8 (dd), 40.6, 33.3, 21.0, 19.7, 14.1

1. customThe crude product was purified by flash chromatography