(Pyrimidin-5-yl)boronic acid → 1-Methyl-4-nitro-2-[6-(5-pyrimidinyl)pyrimidin-4-ylamino]benzene

Participants

Reaction Steps

3.28 g of 2-[(6-chloro)pyrimidin-4-ylamino]-1-methyl-4-nitrobenzene (Reference Example 20 (step 1)) were dissolved with heating in 130 ml of anhydrous ethanol. 1.69 g of dihydroxy(5-pyrimidinyl)borane was added, and then deaeration was performed, followed by purging with argon. 5.82 g of potassium carbonate and 2.15 g of tetrakis(triphenylphosphine)palladium (0) were added in turn, and then the mixture was heated at reflux for 7.5 hours. The reaction solution was mixed with water, followed by extraction with ethyl acetate twice, and dried over anhydrous magnesium sulfate, and then the solvent was distilled off under reduced pressure. The residue was crystallized by adding chloroform-methanol to obtain 808 mg of the objective compound as ocherous crystals.

Provenance & Evidence