nichtkonzertierte [2 + 2]-Cycloaddition von 1H-1,2-Diazepinen an Ketene hergestellt. Sie bilden eineneueKlassevonbicyclischenβ-Lactamen die strukturell den Cephalosporinantibiotika etwas ähneln. Diese Addukte besitzen jedoch keine saure Gruppe in α-Stellung zum Brückenkopfstickstoffatom; auch war keine bakteriostatische Wirkung zu erwarten. Ausgehend von monosubstituierten Ketenen und 1,2-Diazepinen
Reactions of 1H-1,2- and 1H-1,3-diazepines with dimethyl acetylenedicarboxylate
作者:Jyoji Kurita、Naoki Kakusawa、Takashi Tsuchiya
DOI:10.1039/c39870001880
日期:——
The title reactions yield the 3a, 7a-dihydropyrrolo[3,2-b]pyridines (2) and 3a,7a-dihydroindazoles (9), respectively, probably via the diazonine intermediates (4) and (8) derived from the initially formed [2 + 2]π cycloadducts; the indazoles (9) further react with the reagent to give the dimethyl phthalates (6) and the pyrazoles (7)via the [4 + 2]π cycloadducts (10).
标题反应可能分别通过最初形成的重氮基中间体(4)和(8)生成3a,7a-二氢吡咯并[3,2- b ]吡啶(2)和3a,7a-二氢吲唑(9)。[2 + 2]π个环加合物;的吲唑(9)还与所述试剂反应,得到二甲基邻苯二甲酸酯(6)和吡唑(7)经由所述[4 + 2]πcycloadducts(10)。
Cycloaddition Reactions of Azepines and Diazepines with Conjugated Double Bonds Possessing Electron-Withdrawing Groups
作者:Katsuhiro Saito、Shigenori Iida、Toshio Mukai
DOI:10.1246/bcsj.57.3483
日期:1984.12
Cycloadditions of 1-ethoxycarbonyl-1H-azepine with 5-methoxycarbonyl-2-pyrone gave [4+2] and [4+6] type adducts and a benzazepine derivative, while the reaction of the azepine derivative with 3-methoxycarbonyl-2-pyrone afforded only a [4+2] type adduct. Similarly, an addition of 1-ethoxycarbonyl-1H-1,2-diazepine with 5-methoxycarbonyl-2-pyrone gave a benzodiazepine derivative. Reactions of the azepine
The reaction of 1-ethoxycarbonyl-1H-azepine with chlorosilane derivatives in HMPA in the presence of magnesium afforded the silanol derivatives, which upon heating gave the corresponding siloxane derivatives. In the same manner, tropone and 2,5-dimethyl-3,4-diphenylcyclopentadienone afforded the reduced dimers of them. However, tetraphenylcyclopentadienone and 2,5-dimethoxy-3,4-diphenylcyclopentadienone
Cycloaddition reactions of 1,2-diazepines with nitrile oxides. synthesis of 1,2,9-triaza-8-oxabicyclo-[5.3.0]-3,5,9-decatriene derivatives
作者:Jacques Streith、Gérard Wolff、Hans Fritz
DOI:10.1016/0040-4020(77)84084-2
日期:1977.1
A new heterocyclic system, 1,2,9-triaza-8-oxabicyclo-[5.3.0]-3,5,9-decatriene 4, has been synthesized by regiospecific 1,3-dipolar cycloaddition of nitrile oxides to the imine double bond of 1,2-diazepines. Bis-adduct 5a is obtained in only trace amounts showing that the imine double bond is more reactive than the Δ4-olefinic bond.