Nitrogen Stereodynamics and Complexation Phenomena as Key Factors in the Deprotonative Dynamic Resolution of Alkylideneaziridines: A Spectroscopic and Computational Study
作者:Leonardo Degennaro、Luisa Pisano、Giovanna Parisi、Rosmara Mansueto、Guy J. Clarkson、Michael Shipman、Renzo Luisi
DOI:10.1021/acs.joc.5b00848
日期:2015.6.19
heterosubstituted organolithiums, generated by lithiation of alkylideneaziridines. Factors such as the nitrogen inversion barrier, the stereochemistry at the nitrogen atom, the substitution pattern of the alkylideneaziridines, and the reaction conditions are taken into consideration. The interplay between nitrogen stereodynamics and complexation phenomena seems to be crucial in determining the stereochemical
本工作旨在阐明由亚烷基叠氮基吡啶的锂化产生的手性杂取代有机锂的反应中观察到的立体选择性的起源。考虑诸如氮转化阻挡层,氮原子上的立体化学,亚烷基氮杂氮杂环丁烷的取代方式以及反应条件等因素。氮立体动力学和络合现象之间的相互作用似乎对于确定锂化/捕集序列的立体化学结果至关重要。通过协同使用NMR实验(在锂化中间体上运行)和计算数据,对发现进行了合理化。已经证明,在这样的系统中,确定立体化学的步骤是去质子化反应,提出了基于去质子动态分辨率的模型。这样的发现可以发现在氮丙啶以外的动态系统中的应用。