p-Toluenesulfonic acid → 5-Chlorobenzoxazole

反応式

[NH2:1][C:2]1[CH:7]=[C:6]([Cl:8])[CH:5]=[CH:4][C:3]=1[OH:9].[CH3:10]C1C=CC(S(O)(=O)=O)=CC=1.CC(OO)=O>C1COCC1>[Cl:8][C:6]1[CH:5]=[CH:4][C:3]2[O:9][CH:10]=[N:1][C:2]=2[CH:7]=1

参加物

反応条件

温度: 60 °C

実験手順

To a 250 mL 3-neck round bottom flask equipped with a distillation head, glass stopper, septum, thermocouple and magnetic stir bar was charged 2-amino-4-chlorophenol (20.00 g, 0.139 mol). The solid was dissolved in THF (60 mL) and p-TsOH (0.265 g, 1.39 mmol) was added. The brown solution was warmed to 60° C. over 10 min and aged for 90 min. HPLC assay of the reaction mixture showed 1 LCAP unreacted starting material. The temperature was increased from 60° C. to 74° C., and at 63° C. solvent distillation began. A total of 58 mL was collected during the first distillation. The mixture was diluted with THF (60 mL) and a total of 67 mL of solvent was removed between 71 and 84° C. The mixture was again diluted with THF (60 mL) and 61 mL of solvent was removed between 74 and 114° C. The dark brown solution was cooled to room temperature. The final mass of the solution was 27.96 g. Analysis of the crude stream by 1H NMR showed 0.1 wt % MeOH present in the sample. 1H NMR (500 MHz, CDCl3): δ=8.10 (s, 1H), 7.76 (d, J=1.5 Hz, 1H), 7.50 (d, J=8.7 Hz, 1H), 7.36 ppm (dd, J=8.7, 1.7 Hz, 1H).