[2+2] Cycloaddition and ring expansion reactions of cyclic phosphonium and aminophosphonium salts: synthesis and structure of the first eight-membered ylide-type heterocycles
作者:Tetsuya Uchiyama、Tetsuya Fujimoto、Akikazu Kakehi、Iwao Yamamoto
DOI:10.1039/a807891b
日期:——
A series of new eight-membered heterocycles, 4 and 6, was isolated from the reactions of simple six-membered aza-ylides with acetylene and nitrile derivatives. These structures were elucidated by X-ray crystal analysis. On the other hand, the reactions of five-membered ylides and aza-ylides with nitrile derivatives formed seven-membered ylides, which were hydrolyzed immediately during aqueous work-up to give phosphine oxide derivatives.
从简单的六元氮杂环与乙炔和腈衍生物的反应中分离出一系列新的八元杂环,即 4 和 6。这些结构通过 X 射线晶体分析得以阐明。另一方面,五元醯化物和氮杂环醯化物与腈衍生物反应生成七元醯化物,这些醯化物在水处理过程中立即水解,生成氧化膦衍生物。