反应详情

Potassium hydroxide/ethanol (10%; 0.035 mol) was added to a solution of 2,6-dichlorophenol (0.035 mol) in tetrahydrofuran (100 ml). The mixture was stirred and 2,4,6-trichloropyrimidine (0.044 mol) was added. The mixture was stirred overnight at 60° C. The reaction was quenched with NaOH 1N solution. The aqueous layers were extracted with EtOAc several times and then the organic layers were combined and washed with NaOH 3N and saturated NaCl, dried and concentrated. The residue was recrystallized from CH2Cl2/hexane. The precipitate was filtered off and dried, yielding 5.98 g 2,4-dichloro-6-(2,6-dichlorophenoxy)pyrimidine (55%) (interm. 12). b) Reaction under Argon atmosphere. 2,4,6-trimethylaniline (0.0678 mol) was added to 2,4-dichloropyrimidine (0.0664 mol) in 1,4-dioxane (100 ml). N,N-di(1-methylethyl)-ethaneamine (0.0830 mol) was added. The reaction mixture was stirred and refluxed for 4 days and the solvent was evaporated. The residue was dissolved in CH2Cl2, washed with a saturated NaHCO3 solution, then dried (Na2SO4), filtered and the solvent was evaporated to give 17.1 g solid residue. This solid was dissolved in CH2Cl2:hexane (1:1; 150 ml), and the resulting solution was concentrated to 100 ml, then filtered. The residue was purified by column chromatography on KP-Sil (eluent: CH2Cl2). The desired fractions were collected and the solvent was evaporated. The less polar fraction was stirred in CH2Cl2 for 3 hours and filtered, yielding 0.44 g 4-chloro-N-(2,4,6-tri-methylphenyl)-2-pyrimidinamine (intermediate 48). A second fraction was recrystallized from acetonitrile, filtered off and dried, yielding 2-chloro-1V-(2,4,6-trimethyl-phenyl)-4-pyrimidinamine (intermediate 49).

1. stirringThe mixture was stirred overnight at 60° C
2. customThe reaction was quenched with NaOH 1N solution
3. extractionThe aqueous layers were extracted with EtOAc several times
4. washwashed with NaOH 3N and saturated NaCl
5. customdried
6. concentrationconcentrated
7. customThe residue was recrystallized from CH2Cl2/hexane
8. filtrationThe precipitate was filtered off
9. customdried