Reaktion #46488

Reaktionsgleichung

Acrylic acid

2-amino-5-bromopyridine

Na2CO3

→

title compound

Ausbeute 62.5%

(E)-3-(6-Aminopyridin-3-yl)acrylic acid

Ausbeute 62.5%

Lösungsmittel

H2O

Reaktionsbedingungen

Aufarbeitung

1. 1
   Temperaturthe mixture was heated
2. 2
   Temperaturat reflux
3. 3
   Filtrationfiltered
4. 4
   workup.ADDITIONAdditional H2O (0.5 L) was added
5. 5
   workup.ADDITIONto improve mixing
6. 6
   Filtrationthe solid was collected by suction filtration
7. 7
   WaschenThe filter pad was washed sequentially with H2O (2×0.5 L), cold absolute EtOH (100 mL), and Et2O (2×250 mL)
8. 8
   SonstigeDrying in high vacuum at elevated temperature

Vorschrift

Acrylic acid (23 mL, 0.33 mole) was added carefully to a solution of 2-amino-5-bromopyridine (25.92 g, 0.15 mole) and Na2CO3 (55.64 g, 0.53 mole) in H2O (600 mL). PdCl2 (0.53 g, 0.003 mole) was then added, and the mixture was heated at reflux. After 24 hr, the reaction was cooled to RT and filtered, and the filtrate was adjusted to pH 6 with aqueous HCl. Additional H2O (0.5 L) was added to improve mixing, and the mixture was stirred for 1 hr. The pH was readjusted to 6, then the solid was collected by suction filtration. The filter pad was washed sequentially with H2O (2×0.5 L), cold absolute EtOH (100 mL), and Et2O (2×250 mL). Drying in high vacuum at elevated temperature gave the title compound (15.38 g, 62%) as a tan solid: 1H NMR (300 MHz, DMSO-d6) δ 8.11 (d, J=2.0 Hz, 1 H), 7.75 (dd, J=8.7, 2.0 Hz, 1 H), 7.43 (d, J=15.8 Hz, 1 H), 6.53 (s, 2 H), 6.45 (d, J=8.7 Hz, 1 H), 6.22 (d, J=15.8 Hz, 1 H); MS (ES) m/e 165 (M+H)+.

Quelle