反应详情

温度

80 °C

To a solution of 5-iodo-2-aminobenzoic acid (2.6 g; 10 mmol) in ethylene glycol dimethyl ether (DME, 20 mL) add tetrakis(triphenylphosphine)palladium(0) (150 mg) under argon. After the catalyst dissolved completely, add successively 3-methoxybenzeneboronic acid (1.65 g; 11 mmol) and sodium carbonate (1M in water, 30 mL). Heat the mixture at 80° C. for 1 hour. Cool the reaction mixture then wash with 50% EtOAc in hexane. Filter the aqueous layer through a short pad of celite to remove palladium black and carefully pour the filtrate into cold 3N hydrochloric acid (25 mL) under stirring. Collect the precipitate by filtration and air-dry to obtain 5-(3-methoxyphenyl)-2-aminobenzoic acid as a white solid. B. 5-(3-Methoxyphenyl)benzimidazolidin-2-one

1. dissolutionAfter the catalyst dissolved completely
2. temperatureCool the reaction mixture
3. washthen wash with 50% EtOAc in hexane
4. filtrationFilter the aqueous layer through a short pad of celite
5. customto remove palladium black
6. additioncarefully pour the filtrate into cold 3N hydrochloric acid (25 mL)
7. customCollect the precipitate
8. filtrationby filtration
9. customair-dry