Unified Synthesis of Azepines by Visible-Light-Mediated Dearomative Ring Expansion of Aromatic <i>N</i>-Ylides
作者:Matthew J. Mailloux、Gabrielle S. Fleming、Shruti S. Kumta、Aaron B. Beeler
DOI:10.1021/acs.orglett.0c04050
日期:2021.1.15
unified approach to azepines by dearomative photochemical rearrangement of aromatic N-ylides. Deprotonation of quaternary aromatic salts with 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) or N,N,N′,N’-tetramethylquanidine (TMG) under visible light irradiation provides mono- and polycyclic azepines in yields up to 98%. This ring-expansion presents a new mode of access to functionalized azepines from N-heteroarenes
在本文中,我们报告了通过芳香性N-基团的脱芳香族光化学重排对a庚烷的统一方法。在可见光照射下,用1,8-二氮杂双环[5.4.0]十一碳-7-烯(DBU)或N,N,N',N'-四甲基quan啶(TMG)对季芳族盐进行质子化可提供单环和多环氮杂环庚烷产率高达98%。这种扩环反应提供了一种使用两个简单的步骤和简单的起始原料从N-杂芳烃中获得官能化氮杂环庚烷的新模式。