2-Methoxyethanol → HCID 86690871、化合物

反応式

Br[C:2]1[CH:7]=[N:6][C:5]([Br:8])=[CH:4][N:3]=1.[CH3:9][O:10][CH2:11][CH2:12][OH:13].CC(C)([O-])C.[Na+]>C1COCC1>[Br:8][C:5]1[CH:4]=[N:3][C:2]([O:13][CH2:12][CH2:11][O:10][CH3:9])=[CH:7][N:6]=1

参加物

実験手順

A mixture of 2,5-dibromopyrazine (22-1, 20.0 g, 84.1 mmol), 2-methoxyethanol (6.40 g, 84.1 mmol), and sodium tert-butoxide (11.3 g, 118 mmol) in 168 mL of THF was stirred at room temperature overnight. The solution was concentrated under reduced pressure and added with ethyl acetate. The mixture was filtered and the filtrate was concentrated under reduced pressure. The residue was purified by column chromatography on silica gel (EtOAc:hexanes=1:5 as eluant) to give 2-bromo-5-(2-methoxyethoxy)pyrazine (22-2, 17.2 g) as yellow oil in 88% yield: 1H NMR (500 MHz, CDCl3) δ 8.16 (d, J=1.0 Hz, 1 H), 8.07 (d, J=1.0 Hz, 1 H), 4.46 (t, J=5.0 Hz, 2 H), 3.74 (m, 2 H), 3.43 (s, 3 H).