Nonplanar Aromatic Compounds. 3. A Proposed New Strategy for the Synthesis of Buckybowls. Synthesis, Structure and Reactions of [7]-, [8]- and [9](2,7)Pyrenophanes
作者:Graham J. Bodwell、James J. Fleming、Michael R. Mannion、David O. Miller
DOI:10.1021/jo0007027
日期:2000.8.1
A new strategy for the synthesis of Buckybowls is presented and initial attempts to implement it are reported. This involves annulation of further rings onto polycyclic aromatic systems that prefer to be planar but have been "pre-bent" by the installation of a tether. Pyrenophane 2b reacts with TCNE and PTAD to give 1:1 and 1:2 adducts, respectively. The less strained pyrenophane 2c is unreactive toward
提出了一种合成Buckybowls的新策略,并报告了实施该策略的初步尝试。这涉及将另外的环环合到多环芳族体系上,该多环芳族体系优选为平面的,但是由于安装了系绳而被“预弯曲”。吡咯烷2b与TCNE和PTAD反应,分别得到1:1和1:2的加合物。应变较小的吡咯烷2c对TCNE没有反应,但与PTAD的比例为1:2。尝试在各种条件下对苯并oph烷2e进行亲电子芳族溴化反应,以及对溴环化二烯1c(2c的直接合成前体)进行溴化的尝试均未成功。发生链断裂和加成反应而不是取代。为了避免系链断裂问题,制备了[7]-,[8]-和[9](2,7)吡咯烷酮22b-d。然而,溴化尝试和Friedel-Crafts酰化反应失败。还获得了[6](2,7)邻苯二甲oph22a短暂存在的证据。吡喃苯甲酮22a-d与1,n-二恶英类似物2a-d的结构数据(X射线和AM1计算)的比较表明,系链的性质对pyr部分的弯曲程度和这导