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), Et3N (1.5 mL, 10.7 mmol) and acetonitrile (100 mL) was stirred at 50° C. for 4 h and then at room temperature for 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. concentrationThe mixture was concentrated in vacuo
2. custompurified by silica gel chromatography (petroleum ether: ethyl acetate: Et3N=100:10:1)