反应详情

温度

50 °C

To a stirred solution of 2.00 g (1.02 mmol) 4-methoxy-benzothiazole-2,7-diamine in 30 ml DMF at room temperature was added 4.25 g (3.07 mmol) potassium carbonate and the mixture heated to 50° C. A solution of 0.64 ml (1.02 mmol) iodomethane in 10 ml DMF was then added dropwise over 3 h and stirring continued for a further 1 h at 50° C. The mixture was then filtered and the filtrate concentrated in vacuo. Flash chromatography (20/1 dichloromethane/methanol) afforded 600 mg (26%) 4-methoxy-N7,N7-dimethyl-benzothiazole-2,7-diamine as a yellow solid, ES-MS m/e (%): 224 (M+H+, 100); 540 mg (25%) 4-methoxy-N7-methyl-benzothiazole-2,7-diamine as a yellow solid, ES-MS m/e (%): 210 (M+H+, 100) and 340 mg (17%) recovered starting material.

1. filtrationThe mixture was then filtered
2. concentrationthe filtrate concentrated in vacuo