Pyrolytic cascades: a convenient entry to 5H-pyrrolo[2,1-a]isoindol-5-ones and related heterocyclic systems
作者:Hamish McNab、Simon Parsons、Elizabeth Stevenson
DOI:10.1039/a904885e
日期:——
Flash vacuum pyrolysis (FVP) of 1-(2-methoxycarbonylphenyl)pyrrole 2 at 925 °C (0.001 Torr) gives pyrrolo[2,1-a]isoindol-5-one 1 (79%) by a cascade process involving rate determining 1,5-aryl migration, elimination of methanol and electrocyclisation of the resulting ketene intermediate 3; the related heterocyclic systems 6, 9 and 12 were made by analogous methods.
在925°C(0.001 Torr)下对1-(2-甲氧基羧基苯基)吡咯2进行快速真空热解(FVP)可以通过一个级联过程得到吡咯并[2,1-a]异吲哚-5-酮1(产率79%),该过程涉及速率决定的1,5-芳基迁移、甲醇的消除和生成的酮烯中间体3的电环化;相关的杂环系统6、9和12也是通过类似的方法制得的。