Dynamic Biphasic Counterion Exchange in a Configurationally Stable Aziridinium Ion: Efficient Synthesis and Isolation of a Koga C<sub>2</sub>-Symmetric Tetraamine Base
作者:Matthew J. Frizzle、Sebastien Caille、Teresa L. Marshall、Kenneth McRae、Kelly Nadeau、Gary Guo、Steven Wu、Michael J. Martinelli、George A. Moniz
DOI:10.1021/op0602371
日期:2007.3.1
An efficient synthetic process for chiral tetraamine base (R,R)-5 is reported that leverages mechanistic understanding to enable control over key transformations. Specifically, a configurationally stable and observable aziridinium ion intermediate was found to undergo counterion exchange impacting the feasibility of the process. Mechanistic investigations revealed that both counterion exchange and
据报道,一种有效的手性四胺碱(R,R)-5的合成方法,利用机制的理解来控制关键的转化。具体而言,发现构型稳定且可观察到的叠氮鎓离子中间体经历了抗衡离子交换,从而影响了该方法的可行性。机理研究表明,抗衡离子交换和氮丙啶鎓离子的捕集都是双相事件,前者可在较低温度下被抑制,从而促进了小规模和大规模反应。机械方面的见识导致了一种有效的一锅法的发展,该方法可以制备数公斤的(R,R)-5为结晶固体,无需色谱法,具有优异的化学和手性纯度。