反应详情

To a solution of methyl 3-[bis(tert-butoxycarbonyl)amino]-6-(1-tert-butoxycarbonyl-4-piperidyl)pyrazine-2-carboxylate (285 mg) in DCM (7 mL) was added TFA (3 mL) dropwise. The reaction mixture was stirred at room temperature for 1 h, then diluted with acetonitrile and concentrated in vacuo. The reaction mixture was diluted with ethyl acetate, washed with 50% saturated sodium bicarbonate solution (2×20 mL), water, and brine. The product was not able to be extracted from aqueous layer with ethyl acetate, and was taken forward directly to the subsequent acylation step using Schotten-Baumen conditions LC/MS m/z 237.1 [M+H]+.

1. concentrationconcentrated in vacuo
2. additionThe reaction mixture was diluted with ethyl acetate
3. washwashed with 50% saturated sodium bicarbonate solution (2×20 mL), water, and brine
4. extractionto be extracted from aqueous layer with ethyl acetate