反应详情

温度

100 °C

To a suspension of 4.28 g (16.9 mmol) (7-amino-4-methoxy-benzothiazol-2-yl)-carbamic acid methyl ester in 100 ml dioxane and 50 ml ethylene glycol was added 100 ml 5 N NaOH and the mixture was heated at 100° C. for 16 h. After cooling to room temperature, the reaction mixture was concentrated in vacuo and the residue diluted with 300 ml tetrahydrofuran and stirred for 10 minutes. The mixture was filtered and the filtrate concentrated in vactio. The residue was triturated in ether to afford 2.73 g (83%) 4-methoxy-benzothiazole-2,7-diamine as a brown solid. ES-MS m/e (%): 196 (M+H+, 100). b) 4-Methoxy-N7,N7-dimethyl-benzothiazole-2,7-diamine

1. temperatureAfter cooling to room temperature
2. concentrationthe reaction mixture was concentrated in vacuo
3. additionthe residue diluted with 300 ml tetrahydrofuran
4. filtrationThe mixture was filtered
5. concentrationthe filtrate concentrated in vactio
6. customThe residue was triturated in ether