Lithium–Bromide Exchange versus Nucleophilic Addition of Schiff's base: Unprecedented Tandem Cyclisation Pathways
作者:Samantha A. Orr、Emily C. Border、Philip C. Andrews、Victoria L. Blair
DOI:10.1002/chem.201902140
日期:2019.9.12
tert-butyllithium (tBuLi), we have revealed unprecedented competitive intermolecular and intramolecular cascade annulation pathways, leading to valuable compounds, such as iso-indolinones and N-substituted anthracene derivatives. A series of reaction parameters were probed, including solvent, stoichiometry, sterics and organolithium reagent choice, in order to understand the influences that limit such ring-closing
通过探索芳族席夫碱与叔丁基锂(tBuLi)的溴化锂交换反应性,我们发现了前所未有的竞争性分子间和分子内级联环氧化途径,从而产生了有价值的化合物,例如异吲哚啉酮和N-取代的蒽衍生物。探索了一系列反应参数,包括溶剂,化学计量,空间位阻和有机锂试剂的选择,以了解限制此类闭环途径的影响。对于亚胺上的有机锂有两个可行的反应性选项;即亲核加成或溴化锂交换,观察到令人惊讶的竞争性质,即使在低温条件下,亲核加成仍占主导。考虑到最常用的溴化锂交换溶剂,