反应详情

A solution of crude 6-(bromomethyl)-2-(2-nitrophenyl)thiazolo[5,4-b]pyridine (4.0 g), Boc-piperazine (1.99 g, 10.7 mmol), triethylamine (Et3N) (1.5 mL, 10.7 mmol) and acetonitrile (100 mL) was stirred at 50° C. (4 h) and then at room temperature (60 h). TLC demonstrated that the reaction was complete. The mixture was concentrated in vacuo and purified by silica gel chromatography (petroleum ether:ethyl acetate:Et3N=100:10:1) to afford tert-butyl 4-((2-(2-nitrophenyl)thiazolo[5,4-b]pyridin-6-yl)methyl)piperazine-1-carboxylate as a yellow solid (3.6 g, yield: 74% over 2 steps).

1. customat room temperature
2. custom(60 h)
3. concentrationThe mixture was concentrated in vacuo
4. custompurified by silica gel chromatography (petroleum ether:ethyl acetate:Et3N=100:10:1)