Metal catalyst-free N-allylation/alkylation of imidazole and benzimidazole with Morita–Baylis–Hillman (MBH) alcohols and acetates
作者:Olfa Mhasni、Jalloul Bouajila、Farhat Rezgui
DOI:10.3762/bjoc.19.93
日期:——
substitution of cyclic MBH alcohols and acetates with imidazole or benzimidazole, in toluene at reflux with an azeotropic distillation, was successfully carried out with no catalysts or additives, affording the corresponding N-substituted imidazole derivatives in good yields. On the other hand, in refluxing toluene or methanol, the aza-Michael addition of imidazole onto acyclic MBH alcohols was performed using
摘要 在没有催化剂或添加剂的情况下,在回流甲苯中成功地用咪唑或苯并咪唑对环状 MBH 醇和乙酸酯进行高度 α-区域选择性 N-亲核烯丙基取代,并进行共沸蒸馏,得到了相应的 N-取代咪唑衍生物。产量。另一方面,在回流甲苯或甲醇中,使用 DABCO 作为添加剂将咪唑氮杂迈克尔加成到无环 MBH 醇上,产生相应的 1,4-加合物,产率为 70-84%。 贝尔斯坦 J. 组织。化学。 2023, 19, 1251–1258。doi:10.3762/bjoc.19.93