Triphenylphosphine → 5-[2-Amino-6-(2-tert-butoxycarbonylaminoethylsulfanyl)pyrimidin-4-yl]-2,4-dichlorobenzoic acid methyl ester

Participants

Reaction Conditions

Reaction Steps

A mixture of the crude product of 2,4-dichloro-5-(4,4,5,5-tetramethyl[1,3,2]dioxaborolan-2-yl)benzoic acid methyl ester (320 mg) obtained in Step 3 of Example 2-8, [2-(2-amino-6-chloropyrimidin-4-ylsulfanyl)ethyl]carbamic acid tert-butyl ester (177 mg, 0.58 mmol) obtained in Step 1 above, palladium acetate (5 mg, 0.02 mmol), triphenylphosphine (19 mg, 0.07 mmol), 1N aqueous sodium bicarbonate solution (725 μl), and dimethoxyethane (4.4 ml) was stirred at 80° C. for 2 hours. After the reaction solution was cooled to room temperature, water was added thereto and extracted with ethyl acetate. The organic layer was sequentially washed with water and a saturated aqueous sodium chloride solution, and then dried over anhydrous sodium sulfate. After filtration, the filtrate was concentrated under reduced pressure. The resulting residue was purified by silica gel column chromatography (developing solvent: n-hexane:ethyl acetate=3:1 to 1:1) to yield 5-[2-amino-6-(2-tert-butoxycarbonylaminoethylsulfanyl)pyrimidin-4-yl]-2,4-dichlorobenzoic acid methyl ester (96 mg).

Provenance & Evidence