A new synthetic approach towards isoquinobenzazepinone and isoindolinobenzazepinone using acid-mediated cyclisation and Heck reaction
作者:Wong Phakhodee、Poonsakdi Ploypradith、Poolsak Sahakitpichan、Somsak Ruchirawat
DOI:10.1016/j.tet.2008.10.044
日期:2009.1
Six-membered ring cyclisation of N-ethylbenzazepinone, prepared from the condensation of benzazepinone with phenethyl iodide under basic conditions, smoothly provided the corresponding product, isoquino[1,2-b][3]benzazepinone, under acid-mediated conditions. On the other hand, the attempted direct five-membered ring cyclisation using the acid-mediated conditions failed to give the 7,5 fused ring i
在碱性条件下,由苯并ze庚因酮与苯乙基碘的缩合反应制得的N-乙基苯并ze庚酮的六元环环化可在酸性条件下平稳地提供相应的产物异喹啉[1,2- b ] [3]苯并ze庚酮。另一方面,尝试使用酸介导的条件进行的直接五元环环化未能从N-苄基苯并ze庚酮中得到7,5个稠合的环异吲哚并苯并one庚酮,但是获得了7,6个稠合的环产物。然而,通过使用Heck反应然后催化氢化以提供所需的异吲哚并苯并ob庚酮,可以有效地实现N-苄基苯并ze庚酮的五元环环化。