Demethylation of 5,n-di-tert-butyl-8,n-dimethoxy[2.n]metacyclophane-1-ynes with BBr3 to afford novel [n]benzofuranophanes
作者:Thamina Akther、Md Monarul Islam、Taisuke Matsumoto、Junji Tanaka、Xing Feng、Carl Redshaw、Takehiko Yamato
DOI:10.1016/j.molstruc.2016.05.054
日期:2016.10
by successive intramolecular cyclization from 5,19-di- tert -butyl-8,22-dimethoxy[ n ]metacyclophane-1-yne ( syn - 1a – b ) by treatment with BBr 3 in CH 2 Cl 2 at room temperature for 8h. [2. n ]Benzofuranophanes 2a – b were also obtained by treatment of 1,2-di- endo -bromo-5,19-di- tert -butyl-8,22-dimethoxy[ n ]metacyclophane ( meso - 3a – b ) with BBr 3 in CH 2 Cl 2 by using the same reaction conditions
摘要 5,19-二叔丁基-8,22-二甲氧基[n]间环芳烷-1-炔(syn - 1a – b ) 通过在室温下用 CH 2 Cl 2 中的 BBr 3 处理 8 小时。[2. n ]苯并呋喃烷 2a – b 也通过用 BBr 处理 1,2-di-endo-bromo-5,19-di-tert-butyl-8,22-dimethoxy[n]metacyclophane (meso - 3a – b) 获得3 在 CH 2 Cl 2 中使用相同的反应条件。2a-b 的 1 H NMR 谱显示羟基质子与呋喃部分的氧形成分子内氢键,X 射线分析表明 H (OH) 和 O (呋喃) 之间的长度分别为 1.981 和 1.823 A,分别。