尽管有良好的文献先例,但将过量的 2-联苯溴化镁添加到 4,5-二甲氧基-1,3-茚二酮中,然后进行酸处理,并没有得到所需的二醇前体以形成具有固有微孔的有机分子。相反,二氢异苯并呋喃衍生物以中等产率分离,其结构完全通过单晶 X 射线晶体学表征。表明该产物是通过依次格氏加成、逆醛醇反应、第二次格氏加成和酸介导的二氢异苯并呋喃环形成形成的。
尽管有良好的文献先例,但将过量的 2-联苯溴化镁添加到 4,5-二甲氧基-1,3-茚二酮中,然后进行酸处理,并没有得到所需的二醇前体以形成具有固有微孔的有机分子。相反,二氢异苯并呋喃衍生物以中等产率分离,其结构完全通过单晶 X 射线晶体学表征。表明该产物是通过依次格氏加成、逆醛醇反应、第二次格氏加成和酸介导的二氢异苯并呋喃环形成形成的。
Synthesis, Structure, and Nucleophile-Induced Rearrangements of Spiroketones
作者:Przemyslaw Maslak、Sridhar Varadarajan、Jeffrey D. Burkey
DOI:10.1021/jo990867j
日期:1999.10.1
Three tetraketones based on the 2,2'-spirobiindan-1,1',3,3'-tetraone skeleton were prepared and investigated. All three compounds show spiroconjugation between their perpendicular pi-networks. The interaction results in lowering of the energy of the LUMO of the systems by ca. 0.2-0.3 eV as compared to non-spiroconjugated models. The spiroketones are susceptible to nucleophile-induced retro-Claisen condensations that lead to molecular rearrangements destroying spiro connectivity.