反应详情

To a suspension of 4-bromo-3-methylbenzoic acid (25 g) and 4-(dimethylamino)pyridine (“DMAP”, 2.1 g) in CH2Cl2 (320 mL) was added N-(3-dimethylaminopropyl)-N′-ethylcarbodiimide (“EDC”, 22.4 g) portionwise. Then, (aminomethyl)trimethylsilane (8.6 mL) was added, while cooling to keep the internal temperature below 20° C. The reaction was stirred at room temperature overnight. Water was added under vigorous stirring, and the layers were separated. The aqueous layer was extracted twice with CH2Cl2, and the combined organic phase dried (Na2SO4), and filtered over silica gel using CH2Cl2 and methyl tert-butyl ether (MTBE) to afford the title compound (32.8 g, 94%).

1. temperaturewhile cooling
2. customthe internal temperature below 20° C
3. customthe layers were separated
4. extractionThe aqueous layer was extracted twice with CH2Cl2
5. dry with materialthe combined organic phase dried (Na2SO4)
6. filtrationfiltered over silica gel