Phosphine-Catalyzed Interrupted Morita-Baylis-Hillman Reaction and Switchable Domino Reactions of α-Substituted Activated Olefins with Formaldehyde and Mechanism Elucidation
作者:Jing Gu、Ben-Xian Xiao、Qin Ouyang、Wei Du、Ying-Chun Chen
DOI:10.1002/cjoc.201800466
日期:2019.2
3‐Olefinic oxindoles can undergo interrupted Morita‐Baylis‐Hillman reaction with formaldehyde. Apart from the previous reported dephosphoration to access reductive aldol‐type products, here we uncovered that completely different pathways were followed by tuning the substitutions of 3‐olefinic oxindoles. In combination with formalin, an unexpected domino phosphorus‐ylide formation, aldol‐type addition
3-烯烃氧吲哚可能会中断Morita-Baylis-Hillman与甲醛的反应。除了先前报道的脱磷获得还原性醛醇型产品外,我们在这里发现完全不同的途径是通过调节3烯烃氧基吲哚的取代来实现的。与福尔马林合用时,观察到意外的多米诺骨牌磷内酯形成,醛醇型加成,血醛缩醛形成和O取代过程产生了1,3-二氧戊环衍生物。此外,通过简单地用低聚甲醛代替福尔马林,提供了通过关键的氢化物转移过程生产甲酸酯衍生物的可转换序列。进行密度泛函理论计算以很好地阐明催化反应机理。