反応 #42472

反応方程式

methyl 8-bromo-4-butyl-3,4-dihydro-2H-1,4-benzoxazine-6-carboxylate

copper cyanide

hydrochloric acid

→

title compound

収率 66.7%

Methyl 4-butyl-8-cyano-3,4-dihydro-2H-1,4-benzoxazine-6-carboxylate

収率 66.7%

溶媒

NMP

反応条件

後処理

1. 1
   温度The resulting mixture was cooled to room temperature
2. 2
   抽出The acidic aqueous layer was extracted with ethyl acetate
3. 3
   洗浄washed with 1 N hydrochloric acid (15 mL), saturated sodium bicarbonate (15 mL), and brine
4. 4
   乾燥dried (magnesium sulfate)
5. 5
   ろ過filtered
6. 6
   濃縮concentrated under reduced pressure
7. 7
   その他Purification by flash column chromatography (silica, 1:9 ethyl acetate/hexanes)

実験手順

To a flask containing methyl 8-bromo-4-butyl-3,4-dihydro-2H-1,4-benzoxazine-6-carboxylate (0.33 g) was added NMP (7 mL), followed by copper cyanide (0.18 g). The mixture was then heated to 175° C. and stirred overnight. The resulting mixture was cooled to room temperature and poured into 1 N hydrochloric acid. The acidic aqueous layer was extracted with ethyl acetate, washed with 1 N hydrochloric acid (15 mL), saturated sodium bicarbonate (15 mL), and brine, dried (magnesium sulfate), filtered, and concentrated under reduced pressure. Purification by flash column chromatography (silica, 1:9 ethyl acetate/hexanes) provided 184 mg of the title compound: 1H NMR (300 MHz, CDCl3) δ 7.55, 7.43, 4.41, 3.89, 3.39, 3.31, 1.58, 1.40, 0.97.

出典