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。
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。
Synthesis of Structurally Diverse Benzotriazoles via Rapid Diazotization and Intramolecular Cyclization of 1,2‐Aryldiamines
作者:Réka J. Faggyas、Nikki L. Sloan、Ned Buijs、Andrew Sutherland
DOI:10.1002/ejoc.201900463
日期:2019.9
mild conditions, using a polymer‐supported nitrite reagent and p‐tosic acid. The functional group tolerance of this approach was further demonstrated with effective activation and cyclization of N‐alkyl, ‐aryl, and ‐acyl ortho‐aminoanilines leading to the synthesis of N1‐substituted benzotriazoles. The synthetic utility of this one‐pot heterocyclization process was exemplified with the preparation of a
“All-water” one-pot diverse synthesis of 1,2-disubstituted benzimidazoles: hydrogen bond driven ‘synergistic electrophile–nucleophile dual activation’ by water
作者:Damodara N. Kommi、Pradeep S. Jadhavar、Dinesh Kumar、Asit K. Chakraborti
DOI:10.1039/c3gc37004f
日期:——
promoting the subsequent nitro reduction and in the final cyclocondensation steps. The role of water in promoting the cyclocondensation reaction through hydrogen bonds is realized by the differential product yields during the reaction of mono-N-phenyl-o-phenylenediamine with benzaldehyde performed separately in water and D2O. The better hydrogen bond donor and hydrogen bond acceptor abilities of water
A selenium‐catalyzed carbonylative reaction for the synthesis of 2‐benzimidazolones from 2‐nitroanilines has been developed. In this strategy, to avoid the usage of toxic CO gas, TFBen (benzene‐1,3,5‐triyl triformate) was used as a solid and stable CO precursor, and a variety of desired 2‐benzimidazolones were produced in moderate to excellent yields.
Synthesis of functionalised indolines by radical-polar crossover reactions
作者:John A. Murphy、Faiza Rasheed、Stéphane Gastaldi、T. Ravishanker、Norman Lewis
DOI:10.1039/a607060d
日期:——
Functionalised indolines have been prepared by treating
tetrathiafulvalene (TTF) with
2-(N-acyl-N
-allylamino)benzenediazonium tetrafluoroborates.
N-Benzoyl-protected substrates afford complex reaction
mixtures due to competing radical cyclisation onto the benzoyl group.
Acetamides react more efficiently affording good yields of product
alcohols when the reactions are carried out in moist acetone
A concise synthesis of a benzimidazole analogue of mycophenolic acid using a BF3-Et2O catalyzed amino-claisen rearrangement.
作者:Gaifa Lai、Wayne K. Anderson
DOI:10.1016/s0040-4039(00)91811-2
日期:1993.10
A nine-step synthesis of the benzimidazole analogue, 2, of mycophenolicacid is reported involving both the BF3-Et2O catalysed aromatic amino- and the ortho ester Claisen rearrangements as key steps.