反应详情

温度

55 °C

2,4,5,6-tetrachloropyrimidine (0.0134 mol), 1,4-dioxane (30 ml), 2,4,6-trimethyl aniline (0.0134 mol), and N,N-bis(1-methylethyl)ethanamine (0.0136 mol) were added to a flask under argon and stirred at 55° C. for 16 hours. The solvent was evaporated, and the residue was dissolved in CH2Cl2, then purified by column chromatography over silica gel (eluent: CH2Cl2/hexane 1/4, and 1/2). The desired fractions were collected and their solvent was evaporated, yielding 0.15 g 4,5,6-trichloro-N-(2,4,6-trimethylphenyl)-2-pyrimidinamine (interm. 6) and 3.15 g 2,5,6-trichloro-N-(2,4,6-trimethylphenyl)-4-pyrimidinamine (interm. 7). b) A mixture of intermediate 7 (0.00474 mol) in NH3, (2.0 M in 2-propanol; 20 ml) was heated in a pressure vessel at 75–80° C. for 40 hours. The temperature was increased to 110–115° C. The solvent was evaporated to produce 1.85 g of residue. The sample was heated with NH3, (0.5 M in 1,4-dioxane; 20 ml) at 125° C. for 18 hours. The solvent was evaporated, yielding 1.7 g of a mixture of two isomers, i.e. 2,5-dichloro-N4-(2,4,6-trimethylphenyl)-4,6-pyrimidinediamine (interm. 8) and 5,6-dichloro-N4-(2,4,6-trimethylphenyl)-2,4-pyrimidinediamine (interm. 9).

1. customThe solvent was evaporated
2. dissolutionthe residue was dissolved in CH2Cl2
3. custompurified by column chromatography over silica gel (eluent: CH2Cl2/hexane 1/4, and 1/2)
4. customThe desired fractions were collected
5. customtheir solvent was evaporated