反応 #86418

反応方程式

4-bromo-2-nitroaniline

tert-butyl 4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-5,6-dihydropyridine-1(2H)-carboxylate

tripotassium phosphate trihydrate

→

title compound

収率 75.0%

tert-butyl 4-(4-amino-3-nitrophenyl)-5,6-dihydropyridine-1(2H)-carboxylate

収率 75.0%

溶媒

dioxane

water

反応条件

後処理

1. 1
   ろ過Filtration and concentration
2. 2
   その他gave crude product, which
3. 3
   その他was purified by silica gel column chromatography

実験手順

To a degassed mixture of 4-bromo-2-nitroaniline (1 g, 4.6 mmol), tert-butyl 4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-5,6-dihydropyridine-1(2H)-carboxylate (1.42 g, 4.6 mmol), tripotassium phosphate trihydrate (3.9 g, 14.64 mmol) in dioxane and water (30 mL, 8:1) was added Pd(dppf)2Cl2 (337 g, 0.46 mmol). The mixture was refluxed at 110° C. for 3 hours. Filtration and concentration gave crude product, which was purified by silica gel column chromatography to afford the title compound (1.1 g, yield: 75%). MS (ESI): 320 [M+H]+.

出典