反应详情

温度

-40 °C

To a suspension of 2-(2-(4-chlorophenyl)imidazo[1,2-a]pyridin-3-yl)-N′-hydroxyacetimidamide (83.3 mmol, 25.0 g) in dry CHCl3 (600 mL) was cooled to −40° C. in an ice/EtOH bath under N2 atmosphere, Py. (100.0 mmol, 8.1 mL) was added in one portion, and followed by slowly adding ethyl 2-chloro-2-oxoacetate (166.6 mmol, 18.6 mL). After that, the reaction mixture was allowed to slowly rise up to r.t., and kept stirring for 1.0 H, D, then heated to 80 C for another 2 hs. The reaction mixture was cooled to r.t. and filtered, and the filtrate was evaporated under reduced pressure to give the brown residue, which was applied to C.C.eluted by petroleum/acetone (4:1, 2:1, 1:1, and 0:1). The acetone portion was concentrated in vacuo to give the solid, which was washed with acetone for 3 times, to obtain the product, 18.0 g (58.0%), as a white solid. m/e+=383 (M+H+).

1. addition(100.0 mmol, 8.1 mL) was added in one portion
2. customto slowly rise up to r.t.
3. temperatureheated to 80 C for another 2 hs
4. temperatureThe reaction mixture was cooled to r.t.
5. filtrationfiltered
6. customthe filtrate was evaporated under reduced pressure
7. customto give the brown residue, which
8. concentrationThe acetone portion was concentrated in vacuo
9. customto give the solid, which
10. washwas washed with acetone for 3 times
11. customto obtain the product, 18.0 g (58.0%)