Water → 2-[2-Amino-4-(1,3-dihydroisoindole-2-carbonyl)quinazolin-6-yl]benzoic acid

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Reaction Conditions

Reaction Steps

266 mg of ethyl 2-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)benzoate, 399 mg of potassium carbonate, 3 ml of water and 17.7 mg of [1,1′-bis(diphenylphosphino)ferrocene]dichloropalladium(II) are added to a solution of 300 mg of 2-amino-6-iodo-4-(1,3-dihydroisoindol-2-ylcarbonyl)quinazoline (“A130”) in 10 ml of ethanol under argon. The mixture is heated at 120° C. for 30 min, during which a clear solution forms. It is filtered through kieselguhr while hot. On cooling, ethyl 2-[2-amino-4-(1,3-dihydroisoindole-2-carbonyl)quinazolin-6-yl]benzoate crystallises out (retention time LC-MS: 2.056 min; “gradient polar” method). The crystals are taken up in 10 ml of sodium hydroxide solution (2 N) and stirred at 25° C. for 12 h. The mixture is extracted three times with 10 ml of diethyl ether each time, the aqueous phase is adjusted to pH 7, and the mixture is re-extracted with 10 ml of diethyl ether each time. The organic phase is dried over sodium sulfate and filtered, the filtrate is evaporated to dryness in vacuo.

Provenance & Evidence