Synthesis, Modification, and Characterization of a Family of Homologues of <i>e</i><i>xo</i>-Calix[4]arene: <i>e</i><i>xo</i>-[<i>n</i>.<i>m</i>.<i>n</i>.<i>m</i>]Metacyclophanes, <i>n</i>,<i>m</i> ≥ 3
作者:Dennis H. Burns、Ho−Kit Chan、Jeffrey D. Miller、Charles L. Jayne、David M. Eichhorn
DOI:10.1021/jo0003044
日期:2000.8.1
ring construction in the final step. The exo-[n.m.n.m]metacyclophane ring is conformationally mobile on the NMR time scale, and X-ray crystallography reveals that exo-[3.3.3.3]metacyclophane 2a assumes a cone conformation, and that exo-[6.6.6.6]metacyclophane 6a assumes a chair conformation. Molecular mechanics calculations show that both conformations for each exo-metacyclophane are very similar in energy
分6步(从2-溴茴香醚开始)制备exo- [nmnm] metacyclophanes族(n,m>或= 3)的一般策略,该方法利用[2 + 2]方法提供exo-描述了具有良好至中等产率的间环苯环。可溶性铜催化剂[CuBr-LiSPh-LiBr-THF]用于在几个合成步骤中有效地偶联格氏试剂和烷基或醚甲苯磺酸盐试剂,包括最后一步中的环结构。exo- [nmnm] metacyclophane环在NMR时间尺度上是构象可移动的,并且X射线晶体学揭示exo- [3.3.3.3] metacyclophane 2a呈现圆锥构象,exo- [6.6.6.6] metacyclophane 6a呈现圆锥构象。椅子的构造。分子力学计算表明,每个exo-metacyclophane的两个构象在能量上都非常相似。