[CH3:1][C:2]1[C:10]([B:11]2[O:15][C:14]([CH3:17])([CH3:16])[C:13]([CH3:19])([CH3:18])[O:12]2)=[CH:9][CH:8]=[CH:7][C:3]=1[C:4](O)=[O:5].S(Cl)([Cl:22])=O>CN(C=O)C.C(Cl)(Cl)Cl>[CH3:1][C:2]1[C:10]([B:11]2[O:15][C:14]([CH3:17])([CH3:16])[C:13]([CH3:19])([CH3:18])[O:12]2)=[CH:9][CH:8]=[CH:7][C:3]=1[C:4]([Cl:22])=[O:5]2-Methyl-3-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)-benzoic acid (1.2 g, 46.0 mmol) was placed into 40 ml scintillation vial equipped with a small stir bar. 10.0 ml of anhydrous chloroform was added following by 1.8 ml of thionyl chloride and 2 drops of anhydrous DMF. After 3 hours, the solvent and excess thionyl chloride were evaporated under vacuum. The brown residue was treated with 40 ml of hexane, filtered, and concentrated to give 985 mg (Yield=70.5%) of the product as a greenish oil. 1H NMR (CDCl3, 400 MHz) δ 8.15 (d, 1H), 7.95 (d, 1H), 7.3 (t, 1H), 2.75 (s, 3H), 1.4 (s, 12H). The reaction was run several times and the yield was ranging from 60 to 99%.
読み込み中…
