N1‐(2‐chlorocyclohexyl) amidine 2a and N‐(2‐chlorocyclohexyl)acetamide (3) via the competitive addition of acetonitrile and N‐chloro‐N‐tosylamino anion to cyclohexenechloronium ion. This reaction can be catalyzed by Cu(OAc)2, primarily affording 2a. Furthermore, the resulting 2a can be cyclized to benzimidazol 14a in good yield by treating with KOH in dioxane.
结果表明,
二氯胺-T(1)与
环己烯在
乙腈中反应生成N 1-(2-
氯环己基)2 2a和N-(2-
氯环己基)乙酰胺(3)通过竞争性添加
乙腈和N-
氯- N-
甲苯磺酰基
氨基阴离子为
环己烯氯鎓离子。该反应可以由Cu(OAc)2催化,主要得到2a。此外,通过在
二恶烷中用KOH处理,可以将所得的2a以良好的产率环化成
苯并咪唑14a。