Photochemistry of <i>o</i>-Pyrrolylstilbenes and Formation of Spiro-2<i>H</i>-pyrroles and Their Rearrangement to Dihydroindoles
作者:Nikola Basarić、Željko Marinić、Marija Šindler-Kulyk
DOI:10.1021/jo061435t
日期:2006.12.1
and biradicals 12. Intramolecular cyclization of intermediates 10−12 gives rise to polycyclic compounds spiro-2H-pyrroles 7, pyrroloisoindoles 3, and pyrroloisoquinolines 8. Spiro-2H-pyrroles 7 rearrange on silica gel, giving dihydroindoles 2.
1,2-二苯乙烯基吡咯1a - 1c的激发态通过两个光化学过程失活:顺式-反式异构化和NH到二苯乙烯双键的氢转移。NH转移导致形成两个醌二甲烷中间体10和11,以及双自由基12。中间体的分子内环化10 - 12产生了多环化合物螺-2 ħ -pyrroles 7,pyrroloisoindoles 3,和pyrroloisoquinolines 8。Spiro-2 H-吡咯7在硅胶上重新排列,得到二氢吲哚2。