反应详情

温度

110 °C

A mixture of Example 21A (1.0 g, 2.8 mmol), tert-butyl (2E)-3-(tributylstannyl)-2-propenylcarbamate (prepared according to the procedure described in Synthesis, 1991, (12), 1201, 1.5 g, 3.36 mmol), and potassium flouride (195 mg, 3.36 mmol) in toluene (10 mL) was degassed, treated with Pd(PPh3)4 (194 mg, 0.17 mmol), degassed, and heated to 110° C. for 14 hours under a nitrogen atmosphere. The mixture was concentrated and purified by flash chromatography on silica gel with dichloromethane/ethyl acetate (6:4) to provide the desired product (1.3 g, 3.36 mmol). 1H NMR (DMSO-d6, 400 MHz) δ 7.93 (s, 1H), 7.35 (s, 1H), 6.55 (d, 1H), 6.21 (dt, 1H), 5.81 (br s, 2H), 4.73 (br s, 1H), 3.98 (s, 2H), 1.48 (s, 9H); reverse phase HPLC (5% to 95% acetonitrile over 25 minutes, 1 mL/min, 254 nm, hypersil HS 100 Å, C18, 5 μm, 250×4.6 column) Rt=15.5 minutes; MS m/e 385.1.

1. customwas degassed
2. customdegassed
3. concentrationThe mixture was concentrated
4. custompurified by flash chromatography on silica gel with dichloromethane/ethyl acetate (6:4)