反应详情

温度

4 °C

A solution of 0.029 g (0.16 m mole) of the product of step A, in 1 ml ethanol containing 0.42 m mole sodium ethoxide, was placed under a nitrogen atmosphere and cooled to 4° C. with stirring. After 5 minutes, 0.035 g (0.21 m mole) of solid 4-methyl-5-chloromethylimidazole was added. The mixture was stirred for 40 minutes, poured into brine (30 ml) and then extracted with chloroform (3×15 ml). After drying (Na2SO4), the solvent was removed by evaporation. The residue was purified by thin layer chromatography on silica gel plates using a methanol-chloroform (1:4) solvent system to give 0.022 g (50%) of the title compound as a syrup which crystallized on standing at room temperature. Trituration with chloroform gave the crystalline product, m.p. 147°-149° C. I.R. (nujol): 3360 (NH), 3300 (C≡CH), 2160 (C≡N), 1600 and 1585 (C=N) cm-1 ; n.m.r. (acetone D6): δ 8.53 (1H, NH), 7.68 (s, 1H), 7.00 (1H, NH), 4.13 (q, 2H, J=2.5 Hz), 3.73 (s, 2H), 3.53 (m, 2H), 2.73 (m, 3H), 2.21 (s, 3H).

1. stirringThe mixture was stirred for 40 minutes
2. extractionextracted with chloroform (3×15 ml)
3. dry with materialAfter drying (Na2SO4)
4. customthe solvent was removed by evaporation
5. customThe residue was purified by thin layer chromatography on silica gel plates