Calix[6]arene Derivatives Selectively Functionalized at Alternate Sites on the Smaller Rim with 2-Phenylpyridine and 2-Fluorenylpyridine Substituents to Provide Deep Cavities
作者:Xianshun Zeng、Andrei S. Batsanov、Martin R. Bryce
DOI:10.1021/jo0614341
日期:2006.12.1
The synthesis is described of calix[6]arene derivatives 4, 9, and 14 functionalized at alternate sites on the smaller rim with 4‘-(pyrid-2‘ ‘-yl)phenylmethoxy, (6‘-phenylpyrid-3‘-ylmethoxy), and 6‘-[2-(9,9-di-n-hexylfluorenyl)]pyrid-3‘-ylmethoxy} substituents, respectively. They were obtained by 3-fold reactions of 2-[4-(bromomethyl)phenyl]pyridine (3), 5-(bromomethyl)-2-phenylpyridine (8), and 5-(bromomethyl)-2-(9
合成是杯的描述[6]芳烃衍生物4,9和14在上较小的轮辋备用站点与4官能“ - (吡啶-2-”“ -基)苯基甲氧基,(6'-苯基吡啶-3'-基甲氧基)和6'-[2-(9,9-二-正己基芴基)]吡啶-3'-基甲氧基}取代基。它们是通过2- [4-(溴甲基)苯基]吡啶(3),5-(溴甲基)-2-苯基吡啶(8)和5-(溴甲基)-2-(9,9)的三倍反应获得的-二-正己基芴基)吡啶(13)与叔丁基杯[6]芳烃的1,3,5-三甲基醚在氢化钠在THF中的存在下产率为56-75%。详细分析11 H NMR谱(包括变温数据为4)已经建立了4,9和14在主要存在Ç 3 v轻微锥形构象Ç小号异构体也观察到。的X射线晶体结构4揭示了类似的锥形构象的两个分子,与所有三个4“ - (吡啶-2-”“ -基)在轴向方向上拉伸苯基甲氧基的取代基。分子I具有二聚体的胶囊结构,其中一个分子的(吡啶-2''-基)苯基甲氧基取