反应详情

Compound 4g was prepared by the same method for preparation of 4b, using pure compound 4 (0.200 g, 585 mmol) and butenyl chloroformate as starting materials to yield compound 4g as a white color solid (98 mg, 38%). 1H NMR (300 MHz, CDCl3) δ 12.46 (s, 1H), 9.22 (s, 1H), 7.56–7.53 (m, 2H), 7.30–7.26 (dd, J=8.6 and 2.4 Hz, 1H), 5.85–5.72 (m, 1H), 5.20–5.13 (m, 2H), 4.29 (t, J=6.9 Hz, 2H), 4.16 (m, 1H), 2.47 (q, J=6.8 Hz, 2H), 1.24 (d, J=6.6 Hz, 6H); 13C NMR: δ170.76, 168.08, 159.19, 155.88, 153.96, 132.63, 132.53, 131.26, 130.40, 128.61, 125.65, 118.32, 66.60, 45.23, 32.74, 22.27; MS m/z 440 (M+), 388, 338, 269, 245, 180, 159.