In Situ Generation and Synthetic Application of 2-Phenylbenzimidazoline to the Selective Reduction of Carbon–Carbon Double Bonds of Electron-Deficient Olefins
作者:Hidenori Chikashita、Shuichi Nishida、Makoto Miyazaki、Yasuhiro Morita、Kazuyoshi Itoh
DOI:10.1246/bcsj.60.737
日期:1987.2
efficiently generated in situ from o-phenylenediamine and benzaldehyde in alcohols. A generally applicable method for the selective reduction of carbon–carbon double bonds of a variety of electron-deficient olefins with an alcoholic solution of PBI is described. The reduction of α,β-unsaturated ketones to the corresponding saturated ketones could also be accomplished (but, less effectively) with PBI with
2-苯基苯并咪唑啉 (PBI) 作为一种温和、选择性和方便的还原剂,可以在醇中从邻苯二胺和苯甲醛有效地原位生成。描述了一种用 PBI 的醇溶液选择性还原各种缺电子烯烃的碳 - 碳双键的普遍适用的方法。在路易斯酸催化剂的帮助下,使用 PBI 也可以将 α,β-不饱和酮还原为相应的饱和酮(但效率较低)。1-甲基-2-(邻硝基苯基)苯并咪唑啉通过邻硝基苯甲醛与N-甲基-邻苯二胺还原的苄叉丙二腈反应制备和分离得到苄基丙二腈和1-甲基-2-(邻硝基苯基)苯并咪唑的高浓度产量。这表明 PBI 作为本还原系统中实际还原物质的有效性。从机制研究来看,目前的减少可以解释为涉及一对同步传输的机制......