反应 #2260122

反应方程式

5-[4-(tert-butyldimethylsilyloxy)phenyl]-3-(phenylethynyl)pyrazin-2-amine

5-[4-(tert-Butyldimethylsilyloxy)phenyl]-3-(phenylethynyl)pyrazin-2-amine

hydrogen

dichloromethane

→

Compound 7r

收率 99.8%

5-[4-(tert-Butyldimethylsilyloxy)phenyl]-3-phenethylpyrazin-2-amine

收率 99.8%

溶剂

ethyl acetate

反应条件

后处理

1. 1
   workup.STIRRINGstirred at room temperature for an hour
2. 2
   其他The catalyst was removed by filtration
3. 3
   浓缩After concentration under reduced pressure
4. 4
   其他the residue was purified by column chromatography (silica gel 40 g, n-hexane/ethyl acetate=2/1)

实验过程

Under an argon atmosphere, to a solution of 5-[4-(tert-butyldimethylsilyloxy)phenyl]-3-(phenylethynyl)pyrazin-2-amine (7p) (400 mg, 996 μmol) in ethyl acetate (20 mL) was added Palladium/charcoal activated (10% Pd) (80.0 mg) at room temperature. The atomosphere in the reaction flask was replaced with hydrogen gas and the mixture was stirred at room temperature for 3 hours. After replacing the atomosphere of the reaction system again with argon, to the mixture was added dichloromethane (15 mL) and stirred at room temperature for an hour. The catalyst was removed by filtration. After concentration under reduced pressure, the residue was purified by column chromatography (silica gel 40 g, n-hexane/ethyl acetate=2/1) to give Compound 7r (403 mg, 994 μmol, 99.8%) as a brown oily substance. Rf=0.48 (n-hexane/ethyl acetate=2/1); 1H NMR (400 MHz, DMSO-d6) δ 0.18 (s, 6H), 0.93 (s, 9H), 2.92 (t, 3H, J=8.0 Hz), 3.05 (t, 3H, J=8.0 Hz), 6.25 (s, 2H), 6.81-6.90 (AA′BB′, 2H), 7.10-7.18 (m, 1H), 7.18-7.35 (m, 4H), 7.75-7.85 (AA′BB′, 2H), 8.27 (s, 1H); 13C NMR (67.8 MHz, DMSO-d6) δ −4.5 (2C), 18.0, 25.6 (3C), 31.7, 34.0, 120.0 (2C), 125.7, 126.1 (2C), 128.2 (2C), 128.5 (2C), 130.9, 135.6, 138.5, 140.1, 141.9, 152.3, 154.6; IR (KBr, cm−1) 507, 635, 677, 698, 750, 781, 841, 914, 1009, 1103, 1146, 1167, 1213, 1254, 1389, 1420, 1454, 1512, 1605, 2857, 2928, 2955, 3061, 3318.

来源