反应详情

To a suspension of 0.01 g 2-(4-methoxy-7-morpholin-4-yl-benzothiazol-2-yl)-4,5,6,7-tetrahydro-1H-imidazo[4,5-c]pyridine hydrochloride in 0.8 ml tetrahydrofurane were added at 0–4° C. 0.06 ml N-ethyldiisopropylamine and 0.003 ml ethyl chloroformate in 0.26 ml tetrahydrofurane. The mixture was refluxed over night, additional 0.06 ml N-ethyldiisopropylamine and 0.05 ml ethyl chloroformate were added and heating was continued for 4 hours. 0.015 ml benzylamine were added and the mixture was kept at 80° C. for 1 hour. Silicagel was added and the solvent was distilled off. The residue was transferred to a column prefilled with silicagel and was chromatographed with ethylacetate. A second chromatography first with ethylacetate/hexane 1:1 and then with ethylacetate/methanol 9:1 yielded 0.003 g (25%) 2-(4-methoxy-7-morpholin-4-yl-benzothiazol-2-yl)-1,4,6,7-tetrahydro-imidazo[4,5-c]pyridine-5-carboxylic acid ethyl ester as yellow solid; MS (ISP): m/e=444 (M+H+).

1. additionwere added at 0–4° C
2. temperatureThe mixture was refluxed over night
3. temperatureheating
4. waitthe mixture was kept at 80° C. for 1 hour
5. additionSilicagel was added
6. distillationthe solvent was distilled off
7. customwas chromatographed with ethylacetate