3-Chloroaniline → 2-chloro-N-(3-chlorophenyl)-9H-purin-6-amine

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

1.4 ml (13 mmol) of 3-chloro-aniline are added to a suspension of 650 mg (3.44 mmol) of 2,6-dichloro-purine in 5 ml of 1-pentanol. The reaction mixture is stirred at 100° C. (oil bath temperature) for 3 hours. After cooling to room temperature, the mixture is diluted with isopropanol and stirred at 10° C. for 90 minutes. The precipitate is filtered off and rinsed with isopropanol and diethyl ether. The crystals are partitioned between 50 ml of 2 N (two normal) sodium hydroxide solution, 100 ml of water and 700 ml of ethyl acetate. The aqueous phase is subsequently extracted twice with ethyl acetate. The combined organic extracts are washed twice with water and once with saturated sodium chloride solution and dried over sodium sulfate. After filtration, the filtrate is concentrated under reduced pressure. The crude product is stirred with diethyl ether and the crystals are dried at 50° C. under an HV. 2-Chloro-6-(3-chloro-phenyl-amino)-purine is obtained; Rf=0.47 (ethyl acetate:hexane=3:1); APCI-MS: (M+H)+=280; HPLC: tret(grad 20/1)=10.26 minutes.

Herkunft & Nachweise