反应详情

温度

25 °C

Cyclopropylmethanol (80.0 g, 1.11 mol) was treated with n-BuLi (2.5 M in hexane, 9.1 g, 57 mL, 0.14 mol) at a temperature ranging from −15 to 0° C. The reaction mixture was stirred for 1 h at 25° C. Then, a solution of 2-(3-fluoro-4-nitro-phenyl)-4-methyl-pentanoic acid ethyl ester in cyclopropylmethanol (30 mL) was added at 25° C. and the reaction mixture was stirred for 16 h. Water (100 mL) was added and the reaction mixture was extracted with EtOAc (3×100 mL). The combined organic phases were washed with water (3×100 mL), brine (100 mL), and dried (MgSO4). Evaporation of the solvent under reduced pressure gave a brown oil, which was purified by silica gel gradient column chromatography by use of Heptane-EtOAc (9:1-4:1) to give 2-(3-cyclopropylmethoxy-4-nitro-phenyl)-4-methyl-pentanoic acid cyclopropylmethyl ester as a yellow oil (34.0 g, 93%). 1H NMR (300 MHz, CDCl3/TMS): δ 7.78 (d, J=8.4 Hz, 1H), 7.06 (s, 1H), 6.97 (d, J=8.4 Hz, 1H), 4.00-3.83 (m, 4H), 3.69 (t, J=8.0 Hz, 1H), 2.07-1.92 (m, 1H), 1.69-1.60 (m, 1H), 1.52-1.42 (m, 1H), 1.32-1.20 (m, 1H), 1.19-1.00 (m, 1H), 0.92 (d, J=6.3 Hz, 6H), 0.68-0.62 (m, 2H), 0.56-0.48 (m, 2H), 0.42-0.38 (m, 2H), 0.26-0.21 (m, 2H); 13C NMR (75 MHz, CDCl3/TMS): δ 172.9, 152.3, 146.2, 138.8, 125.6, 119.8, 114.4, 74.2, 69.8, 49.8, 42.6, 26.0, 22.5, 22.2, 10.0, 9.7, 3.3.

1. customranging from −15 to 0° C
2. stirringthe reaction mixture was stirred for 16 h
3. extractionthe reaction mixture was extracted with EtOAc (3×100 mL)
4. washThe combined organic phases were washed with water (3×100 mL), brine (100 mL)
5. dry with materialdried (MgSO4)
6. customEvaporation of the solvent under reduced pressure
7. customgave a brown oil, which
8. customwas purified by silica gel gradient column chromatography by use of Heptane-EtOAc (9:1-4:1)