Synthesis of benzimidazoles containing a fused alicyclic ring by Rhodium - catalysed hydroformylation of N-alkenyl-1,2-diaminobenzenes
作者:Despina Anastasiou、Eva M. Campi、Hassan Chaouk、W.Roy Jackson
DOI:10.1016/s0040-4020(01)90361-8
日期:1992.9
Rhodium-catalysed reactions of N-alkenyl-1,2-diaminobenzenes(3) with hydrogen and carbon monoxide give benzimidazoles containing a fused alicyclic ring ((8) and (9)) in excellent yields. In some cases intermediate bicyclic compounds can be isolated and the 1H and 13C n.m.r. spectra of one of these, the 3,4,5,6-tetrahydro-4-methyl-3H-1,6-benzodiazocine (6), shows evidence for unusual atropisomerism
铑催化的N-烯基-1,2-二氨基苯(3)与氢和一氧化碳的反应以优异的收率得到了含有稠合脂环族环((8)和(9))的苯并咪唑。在某些情况下,可以分离出中间双环化合物,并且其中一种(3,4,5,6-四氢-4-甲基-3H-1,6-苯并重氮化合物)(1)的1 H和13 C nmr光谱显示不寻常的阻转异构现象的证据。
Catalyst-Controlled Nickel-Catalyzed Intramolecular <i>endo</i>-Selective C–H Cyclization of Benzimidazoles with Alkenes
作者:Zi-Jian Liu、Jiang-Fei Li、Feng-Ping Zhang、Xue-Tao Xu、Mengchun Ye
DOI:10.1021/acs.orglett.2c04012
日期:2023.1.20
Compared with the widely explored exo-selective C–H cyclization, transition metal-catalyzed endo-selective C–H cyclization of benzimidazoles with alkenes has been a formidable challenge. Previous efforts mainly rely on substrate-controlled methods, rendering the product complexity restricted. Herein we report a catalyst-controlled method to facilitate endo-cyclization, in which a bulky N-heterocyclic
A metal catalysed route to benzimidazoles containing a fused alicyclic ring
作者:Despina Anastasiou、Hassan Chaouk、W. Roy Jackson
DOI:10.1016/s0040-4039(00)74365-6
日期:1991.11
Rhodium catalysed reactions of N-alkenyl-1,2-diaminobenzenes (1) with hydrogen and carbon monoxide give benzimidazoles containing a fused alicyclic ring (6,7) in excellent yields.