反应详情

A solution of 4,6-dichloropyrimidine-5-carbonyl chloride (130.5 mg, 0.617 mmol) in anhydrous tetrahydrofuran (1.5 mL) was added dropwise to a solution of methyl 3-(5-(2-(tert-butyldimethylsilyloxy)ethylamino)pyridin-2-yloxy)-2,2-dimethylpropanoate B-18 (157.2 mg, 0.411 mmol) and triethylamine (124.5 mg, 1.233 mmol) in anhydrous tetrahydrofuran (5.0 mL) at 0° C. The reaction mixture was stirred for 30 mins, then allowed to warm to room temperature, stirred for an additional 2 h period and then concentrated to dryness under reduced pressure. The crude residue was purified by flash column chromatography on silica gel (hexanes:ethyl acetate gradient) to give methyl 3-(5-(N-(2-(tert-butyldimethylsilyloxy)ethyl)-4,6-dichloropyrimidine-5-carboxamido)pyridin-2-yloxy)-2,2-dimethylpropanoate B-19 (150 mg, Yield=66%). MS (ESI) [M+1]+ 558.

1. customat 0° C
2. stirringstirred for an additional 2 h period
3. concentrationconcentrated to dryness under reduced pressure
4. customThe crude residue was purified by flash column chromatography on silica gel (hexanes:ethyl acetate gradient)