Synthetic routes based on Newman's1-7 synthesis of a number of polycyclic aromatic hydrocarbons were modified and developed to give a convenient preparation (Scheme 1) of 11 helical molecules formally based on hexalindione (1). In contrast to Newman's work determined the stereochemistry at C6a-C12b in (1a-k) and in some cases, were able to control it. We also investigated the competitive formation of six- and seven- membered rings in the reaction yielding the hexacyclic derivatives (1d, e). In addition, we report an unusual fragmentation (Scheme 2) leading to the unexpected by-product 4-methoxyacetophenone (16) in the synthesis of (1h).
在纽曼 1-7 合成一些多环芳香烃的基础上,对合成路线进行了修改和发展,从而方便地制备出 11 种正式基于己二酮 (1) 的螺旋分子(方案 1)。与纽曼的工作不同的是,我们确定了 (1a-k) 中 C6a-C12b 的立体化学结构,并在某些情况下能够对其进行控制。我们还研究了在生成六环衍生物(1d, e)的反应中,六元环和七元环的竞争性形成。此外,我们还报告了在合成(1h)的过程中出现的一种不寻常的裂解(方案 2),由此产生了意想不到的副产物 4-甲氧基苯乙酮 (16)。