作者:Robert A. Pascal、Andrey Dudnikov、LeaAnn A. Love、Xin Geng、Kelly J. Dougherty、Joel T. Mague、Christina M. Kraml、Neal Byrne
DOI:10.1002/ejoc.201700732
日期:2017.8.2
A series of propeller-shaped, C3-symmetric cyclophanes have been synthesized by the macrocyclization of 1,3,5-trimercaptobenzene (12) with either a tris[o-(halomethyl)aryl]phosphine (e.g. 11) or a tris[o-(halomethyl)aryl]benzene (e.g. 24). Two phosphine-capped cyclophanes (5 and 6) were prepared in this way; they proved to be configurationally stable, and both were resolved into pure enantiomers by
通过 1,3,5-三巯基苯 (12) 与三 [o-(卤甲基) 芳基] 膦 (例如 11) 或三 [o -(卤甲基)芳基]苯(例如24)。以这种方式制备了两种膦封端的环芳烃(5 和 6);它们被证明是构型稳定的,并且在手性载体上通过超临界流体色谱法将两者拆分成纯对映异构体。特别是化合物 6,表现出较大的比旋光度 ([α]D ≈ 800) 和强圆二色性。制成的一种三芳基苯封端的环烷 (9) 对外消旋化具有适度的屏障 (ΔGrac‡ = 15.7 kcal/mol)。还报告了对此类化合物旋光度趋势以及 9 外消旋化途径的计算研究。