反应详情

温度

130 °C

A mixture of 4.08 g (30 millimoles (mmol)) of 4,5-dimethyl-benzene-1,2-diamine (hereinafter compound “1”) and 2.04 grams (g) (10 mmol) of 1-chloro-dodecane in 20 milliliters (mL) of triethylamine was stirred at 130° C. for 6 hrs under argon. After cooling and addition of dichloromethane (100 mL), the organic solution was washed with aqueous Na2CO3 solution (10%, 40 mL). The aqueous layer was extracted twice with dichloromethane (2×100 mL). The combined organic extracts were dried over MgSO4 and rotary evaporated to dryness. The thin-layer chromatography retention factor (Rf) of the target compound (2) was 0.55 with dichloromethane (MC):methanol (MeOH) (95:5) mixture. Compound (2) was purified by flash chromatography on silica gel in MC:MeOH (95:5) to produce 1.8 g of reddish crystals (60% yield); mp 53-54° C.; 1H NMR (400 MHz, CDCl3) δ 6.56 (1H, s), 6.50 (1H, s), 3.20 (3H, broad s), 3.1 (2H, t, J=8 Hz), 2.26 (3H, s), 2.21 (3H, s), 1.68 (2H, q, J=7 Hz), 1.46 (2H, m), 1.34 (16H, s), 0.92 (3H, t, J=8 Hz); 13C NMR (100 MHz, CDCl3) δ 136.0, 131.8, 128.1, 125.9, 118.4, 113.93, 44.7, 31.9, 29.9, 29.69, 29.65, 29.5, 29.4; Anal. Calcd. for C20H36N2 (MW=304.51): C, 78.88; H, 11.92; N, 9.20. Found: C, 78.95; H, 12.16; N, 9.32.

1. temperatureAfter cooling
2. washthe organic solution was washed with aqueous Na2CO3 solution (10%, 40 mL)
3. extractionThe aqueous layer was extracted twice with dichloromethane (2×100 mL)
4. dry with materialThe combined organic extracts were dried over MgSO4
5. customrotary evaporated to dryness
6. customCompound (2) was purified by flash chromatography on silica gel in MC