Toward Customized Tetrahydropyran Derivatives through Regioselective α-Lithiation and Functionalization of 2-Phenyltetrahydropyran
作者:Luciana Cicco、Valeria Addante、Andrea Temperini、Carsten Adam Donau、Konstantin Karaghiosoff、Filippo Maria Perna、Vito Capriati
DOI:10.1002/ejoc.201600365
日期:2016.7
In this contribution, the first direct and efficient functionalization of the preformed 2-phenyltetrahydropyran (2-PhTHP) nucleus by electrophilic interception of the corresponding alpha-lithiated derivative by employing sBuLi as the base and THF as the solvent at -78 degrees C was explored. The presence of N,N,N',N'-tetramethylethylenediamine (TMEDA) proved to be critical to governing reaction feasibility
在这一贡献中,通过使用 sBuLi 作为碱和 THF 作为溶剂,在 -78 摄氏度下,通过亲电拦截相应的 α-锂化衍生物,对预先形成的 2-苯基四氢吡喃 (2-PhTHP) 核进行了首次直接有效的功能化. N,N,N',N'-四甲基乙二胺 (TMEDA) 的存在被证明对于控制极性和非极性溶剂中的反应可行性以及提高反应产率至关重要。发现基于碳和杂原子的卤化物以及脂肪族和芳香族醛和酮、异氰酸酯和羧酸衍生物都是有能力的亲电子试剂。己烷/TMEDA的组合降低了α-锂化光学活性2-PhTHP的外消旋化速率,