Nuclear magnetic resonance investigations of small rings. 3. Carbon-13 NMR spectra of benzo-annulated and exo- and endo-benzocyclobuta-annulated derivatives of exo-cyclopropanorbornane
corresponding pyridazines in a high yield. Two stable diazines, primary product of corresponding 1,4‐dihydropyridazine, were also isolated. Structures were then determined by 1H‐NMR, and 13C‐NMR beside to elemental analyses. The novelpyridazine derivatives (8, 9) efficiently inhibited the cytosolic human carbonicanhydrase isoenzymes I and II (hCA I and II). In addition, these novelpyridazine derivatives
Reactions of bicyclic olefins with palladium chloride–copper chloride
作者:Raymond Baker、Douglas E. Halliday
DOI:10.1039/p29740000208
日期:——
lead predominantly to rearranged chloroacetates. Species possessing carboniumion character have been suggested as intermediates in the pathway involving palladium. Carboniumion formation in the cupric chloride catalysed reactions is much less pronounced. The important role of substituents in determining the rearrangements has been demonstrated and confirmed by the reactions, in acid media, of the
Bromination of ‘
<i>endo</i>
‐Benzocyclobutanorbornene': Synthesis of ‘
<i>endo</i>
‐ 11,12‐Dibromobenzocyclobutanorbornene': High‐Temperature Bromination, Part XIV
rbornene' 5 at −50° led in high yield to the formation of the rearranged dibromides 6 and 7. However, high-temperature bromination of 5 in decalin at 150° gave exclusively nonrearranged product 8 in 98% yield. From the elimination of nonrearranged product 8, ‘endo-bromobenzocyclobutanorbornene' 9 and ‘endo-benzocyclobutanorbornene' 5 were obtained. Similarly, bromination of monobromide 9 at 77° yielded
One‐Pot Synthesis of Polycyclic 4,5‐Dihydropyridazine‐3(2<i>H</i>)‐ones by Inverse Electron‐Demand Diels–Alder (IEDDA) Reactions from Alkenes
作者:Ramazan Koçak、Murat Güney
DOI:10.1002/chem.202302096
日期:2023.10.26
A new practical catalyst-free method for one-pot synthesis of polycyclic 4,5-pyridazine-3(2H)-ones from alkenes was developed. 4,5-Pyridazine-3(2H)-ones were obtained in high yields in the presence of water by Inverse Electron-Demand Diels–Alder (IEDDA) reactions between norbornene and barrelene-derived polycyclic alkenes, and s-tetrazines with leaving groups at the 3,6-positions. This method also
开发了一种实用的无催化剂一锅合成烯烃多环4,5-哒嗪-3(2 H )-酮的新方法。在水存在下,通过降冰片烯和桶烯衍生的多环烯烃和 s-四嗪之间的逆电子需求狄尔斯-阿尔德 (IEDDA) 反应,高产率地获得了 4,5-哒嗪-3(2 H)-酮。 3,6位的基团。该方法在单环烯烃环戊烯和直链烯烃苯乙烯中也取得了成功。
Popescu, Angela; Matei, Irina; Gheorghiu, Mircea D., Revue Roumaine de Chimie, 1991, vol. 36, # 4-7, p. 707 - 714
作者:Popescu, Angela、Matei, Irina、Gheorghiu, Mircea D.、Turdibekov, K. M.、Struchkov, Yu. T.