AlCl<sub>3</sub>-Promoted Conjugate Reduction of α,β Unsaturated Carbonyl Compounds with 1,3-Dimethyl-2-phenylbenzimidazoline
作者:Hidenori Chikashita、Kazuyoshi Itoh
DOI:10.1246/bcsj.59.1747
日期:1986.6
substrates. The catalytic efficiency of Lewis acids was found to be proportional to the efficiency to form a complex with a carbonyl group. The reduction of 2-cinnamoylpyridine with 2-deuterated DMBI revealed that in the reduction product, a deuterium atom was located at the β-position with respect to the carbonyl group. On the other hand, the reduction of the same substrate with DMBI followed by quenching
以1,3-二甲基-2-苯基苯并咪唑啉(DMBI)为还原剂,将除α,β-不饱和醛外的多种α,β-不饱和羰基化合物还原为相应的饱和羰基化合物在 AlCl3 的帮助下。基于 DMBI 的氢化物供体能力以及 AlCl3 作为底物的亲电活化剂的作用讨论了还原反应。发现路易斯酸的催化效率与与羰基形成络合物的效率成正比。用 2-氘代 DMBI 还原 2-肉桂酰基吡啶表明,在还原产物中,氘原子位于羰基的 β 位。另一方面,用 DMBI 还原相同的底物,然后用 D2O 淬灭,得到在 α 位含有氘标记的还原产物。这些结果被解释为涉及烯醇中间体产生的机制......