Contrasting Responses of Pyrido[2,1-<i>a</i>]isoindol-6-ones and Their Sultam Counterparts to Photochemical Activation
作者:Leo A. Paquette、Robert D. Dura、Isabelle Modolo
DOI:10.1021/jo802476c
日期:2009.3.6
sultam counterparts. The synthetic routing takes advantage of the ready availability of N-allylphthalimide and N-allylsaccharin and proceeds via the proper incorporation of small side chains into the heterocyclic ring. Positionally selective introduction of the conjugated diene functionality was realized efficiently. Detailed study of the excited-state chemistry of 7 and 8 showed both lactams to be
基于闭环置换的策略允许访问未报告的一对吡啶并异吲哚酮及其先前未知的sultam对应物。合成路线利用了N-烯丙基邻苯二甲酰亚胺和N-烯丙基糖精的现成优势,并且通过将小侧链适当地掺入杂环中而进行。有效地实现了共轭二烯官能团的位置选择性引入。对7和8的激发态化学的详细研究表明,两种内酰胺均在丙酮敏感的条件下经历[4 + 2]二聚化。涉及不同的区域选择性,响应为8比7所显示的效率高得多。在任何条件下都无法从9和10的光解产物中分离出二聚体。当后者的苏丹阿酰胺进行广泛的聚合反应时,9通过在350 nm处的直接照射分别通过涉及S-N键和杂环裂解的[1,3]-σ转变为46和47。