The unusual formation of methyl α-(5,6-dimethoxycarbonyl-2,3-dimethoxyazepin-7-ylidene)-α-[5-methoxycarbonyl-2,3-dimethoxypyrid-6-yl)acetate during the pyrolysis of “Azido-<i>meta</i>-hemipinate”: First example of a reaction involving a concomitant ring expansion and ring extrusion
作者:S. V. Eswaran、H. Y. Neela、S. Ramakumar、M. A. Viswamitra
DOI:10.1002/jhet.5570330454
日期:1996.7
exception in the ring closure reactions of ortho substituted aryl azides, as it provides no rate acceleration to this reaction. Pyrolysis of “azido-meta-hemipinate”, an aryl azide containing such a substituent, led us to the title compound, a new azepinylidene-pyridylacetic ester, whose structure has been established unambiguously by a single crystal X-ray diffraction study. This is the first report of a
在邻位取代的芳基叠氮化物的闭环反应中,邻位甲氧基羰基取代基是唯一的例外,因为它没有为该反应提供速率加速。的“叠氮基-热解的元-hemipinate”,含有这样的取代基的芳叠氮化物,使我们的标题化合物,一种新的azepinylidene吡啶基酯,其结构已通过单晶X射线衍射研究明确地建立的。这是该反应的第一篇报道,该反应既包括扩环为氮杂七烯富瓦烯,也包括扩环为吡啶基环残基。