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-Li
SPh-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。