反应详情

温度

110 °C

A mixture of 4-phenylbut-2-enoic acid (2 g, 12.33 mmol) prepared as in Example 6, Step B, 3,4-dimethoxybenzenethiol (2.1 mL, 14.79 mmol, 1.2 eq), and piperidine (0.4 mL (3.7 mmol, 0.3 eq) is heated at 110° C. in a bomb for 18 hours. The reaction is partitioned between ethyl ether and 1 N HCl. The organic layer is dried over anhydrous MgSO4 and concentrated in vacuo. The product is purified by flash silica gel chromatography to afford 3-(3,4-dimethoxyphenylsulfanyl)-4-phenylbutanoic acid as a yellow oil. (4.1 g, 100%): 1H-NMR (300 MHz, CDCl3) δ (TMS) 2.54(d, 0.5×2H), 2.56(d, 0.5×2H), 2.83(d, 0.5×2H), 2.98(d, 0.5×2H), 3.56(m, 1H), 3.85(s, 3H), 3.88(s, 3H), 6.8(d, 1H), 6.97(d, 1H), 7.05(d, 0.5×1H), 7.09(d, 0.5×1H), 7.15-7.32(m, 5H).

1. customThe reaction is partitioned between ethyl ether and 1 N HCl
2. dry with materialThe organic layer is dried over anhydrous MgSO4
3. concentrationconcentrated in vacuo
4. customThe product is purified by flash silica gel chromatography