반응 #1000747

반응 방정식

4-Bromo-3-chloro-1,2-benzenediamine

propionic acid

HCl

→

title compound

수율 89.0%

5-Bromo-4-chloro-2-ethyl-1H-benzimidazole

수율 89.0%

반응 조건

후처리

1. 1
   추출Treatment with 1 N NaOH was followed by extraction with EtOAc (×3)
2. 2
   세척washing with brine
3. 3
   건조The dried (Na2SO4) organic portions
4. 4
   여과were filtered
5. 5
   농축concentrated
6. 6
   기타chromatographed (SiO2, MeOH/CH2Cl2)

실험 절차

4-Bromo-3-chloro-1,2-benzenediamine (0.17 g, 0.766 mmol), propionic acid (0.17 g, 2.298 mmol), and 4 N HCl (1.724 ml, 6.894 mmol) were combined and heated to 140° C. for 3 h. Treatment with 1 N NaOH was followed by extraction with EtOAc (×3), and washing with brine. The dried (Na2SO4) organic portions were filtered, concentrated, and chromatographed (SiO2, MeOH/CH2Cl2) to obtain 0.177 g of the title compound: 1HNMR (400 MHz, CDCl3) δ 9.50 (broad s, 1H), 7.43 (d, J=8.31 Hz, 1H), 7.35 (broad s, 1H), 2.96 (q, J=7.5 Hz, 2H), 1.43 (t, J=7.5 Hz, 3H); MS (ESI) m/z 261 (M+1).

출처