Pseudopericyclic Dearomative 1,6-Cyclization of 1-(2-Pyridyl)-2-azabuta-1,3-dienes: Synthesis and Ring-Chain Valence Equilibria of 4<i>H</i>
-Pyrido[1,2-<i>a</i>
]pyrazines
作者:Ilya P. Filippov、Mikhail S. Novikov、Alexander F. Khlebnikov、Nikolai V. Rostovskii
DOI:10.1002/ejoc.202000210
日期:2020.5.22
The 1,6‐electrocyclization of 1‐(2‐pyridyl)‐2‐azabuta‐1,3‐dienes, obtained by RhII‐catalyzed reaction of pyridotriazoles with 2H‐azirines, affords stable non‐aromatic 4H‐pyrido[1,2‐a]pyrazines despite the fact that the reaction proceeds with irreversible dearomatization of the pyridine aromatic system.
通过Rh II催化的吡啶三唑与2 H叠氮基的反应获得的1-(2-吡啶基)-2-azabuta-1,3-二烯的1,6-电环化可提供稳定的非芳族4 H吡啶基[ 1,2- a ]吡嗪,尽管该反应会随着吡啶芳族体系的不可逆脱芳香化而进行。