Transfer Reagents 4: Retro-Diels–Alder Routes to 3,6-Di(2-pyridyl)pyridazinonorbornadiene, a Test Bed for the Relative Dienofugacity of Isobenzofuran, Isoindole, and Anthracene
作者:Davor Margetić、Douglas Butler、Ronald Warrener
DOI:10.1055/s-0033-1339879
日期:——
reacted with 3,6-di(2-pyridyl)-s-tetrazine to produce pyridazines (diene-protected alkenes), following dehydrogenation (by DDQ) of the intermediate dihydropyridazines. The title 3,6-di(2-pyridyl)-pyridazinonorbornadiene was produced under flash vacuum pyrolysis conditions by ejection of anthracene (590 °C), isobenzofuran (630 °C) or isoindole (580 °C) from the corresponding pyridazines, establishing
在中间体二氢哒嗪脱氢(通过 DDQ)之后,降冰片二烯环加合物与 3,6-二(2-吡啶基)-s-四嗪反应生成哒嗪(二烯保护的烯烃)。标题 3,6-二(2-吡啶基)-哒嗪壬降冰片二烯是在快速真空热解条件下通过从相应的哒嗪中喷射出蒽 (590 °C)、异苯并呋喃 (630 °C) 或异吲哚 (580 °C) 产生的,建立异吲哚>蒽>异苯并呋喃。在 B3LYP/6-31G* 理论水平计算各自的逆狄尔斯-阿尔德活化能正确预测了实验发现的异苯并呋喃 > 蒽 > 异吲哚顺序。空腔 bis-3,