作者:Stephanie Seel、Guillaume Dagousset、Tobias Thaler、Annette Frischmuth、Konstantin Karaghiosoff、Hendrik Zipse、Paul Knochel
DOI:10.1002/chem.201204076
日期:2013.4.2
We have developed a practical stereoretentive iodine/lithium‐exchange process that allows the stereodefined preparation of cis‐ and trans‐cycloalkyllithium compounds from their corresponding stereodefined iodides. Quenching with electrophiles offers stereospecific access to both cis‐ (up to 96 % cis) and trans‐cycloalkyl derivatives (up to 99 % trans). A detailed study of the thermodynamic stabilities
我们开发了一种实用的立体保留碘/锂交换方法,该方法可以从其相应的立体定义的碘化物中立体定义制备顺式和反式环烷基锂化合物。用亲电试剂猝灭可同时获得顺式(最多96%顺式)和反式-环烷基衍生物(最多99%反式)的立体定向。报告了对轴向和赤道取代的环己基锂试剂的热力学稳定性,立体化学行为和反应性的详细研究。从头算计算表明,低聚环己基锂结构的形成对于解释观察到的立体化学偏好至关重要。