Medium-sized cyclophanes. Part 58. Synthesis and conformational studies of [2.n]metacyclophan-1-enes and [n.1]metacyclophanes
作者:Takehiko Yamato、Koji Fujita、Hirohisa Tsuzuki
DOI:10.1039/b010075g
日期:——
rearrangements of [2.n]metacyclophane-1,2-diols afford [n.1]metacyclophanes in good yield. The [2.n]metacyclophan-1-ene-to-[n.1]metacyclophane ratio of the products is strongly governed by the number of the methylene bridges. The proportion of the rearrangement product increases with increasing length of the bridge. Conformational studies of [n.1]metacyclophanes as well as of [2.n]metacyclophan-1-enes in both
一系列syn-和anti- [2。n ]元环phan-1-烯和[2。通过对1,n-双(5-乙酰基-2-甲氧基苯基)烷烃进行McMurry环化,可以高收率制备n ]间环phane-1,2-二醇。有趣的是,在相同的偶合反应中没有吡啶[2。观察到提供[ n .1]甲基环已烷的n ]甲基环己烯基-1,2-二醇,这归因于TiCl 4或环化反应期间由McMurry试剂产生的酸。实际上,质子酸或路易斯酸会导致频哪醇重排[2。n ]元环phane-1,2-二醇可提供高收率的[ n .1] metacyclophanes。[2。Ñ ] metacyclophan -1-烯TO- [ Ñ 0.1]的产品metacyclophane比率强烈地受到的数量支配亚甲基桥梁。重排产物的比例随着桥长度的增加而增加。[ n .1]个亚基和[2.]的构象研究。还描述了溶液和固态的n ] metacyclophan-1-enes。