“All-water” chemistry of tandem N-alkylation–reduction–condensation for synthesis of N-arylmethyl-2-substituted benzimidazoles
作者:Damodara N. Kommi、Dinesh Kumar、Rohit Bansal、Rajesh Chebolu、Asit K. Chakraborti
DOI:10.1039/c2gc36377a
日期:——
also exerts a beneficial effect in the condensation of N-monobenzylated o-phenylenediamines with aldehydes. The water-assisted C–N bond formation chemistry led to metal/base-free synthesis of N-monobenzylated o-nitroanilines and N-monobenzylated o-phenylenediamines. The indispensable/advantageous role of water in the various stage of the N-alkylation–reduction–condensation process exemplifies an ‘all-water’
“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
Compounds of the following formula ##STR1## are useful as central nervous system depressants, tranquilizers, sedatives, growth promotors, anti-convulsants and muscle relaxants in mammalian species.
Specific features of nucleophilic substitution in 1-chloro-3,4-dinitrobenzene
作者:N. V. Zotova、P. M. Kushakova、V. A. Kuznetsov、A. A. Rodin、A. V. Garabadzhiu
DOI:10.1007/s11178-005-0043-z
日期:2004.10
Effects of the solvent, temperature, and nucleophile nature on the selectivity of nucleophilic substitution in 1-chloro-3,4-dinitrobenzene were studied, and optimal conditions were found for the synthesis and isolation of particular products.
Regular Trends in Nucleophilic Substitutions in 2-Alkylamino-4-chloronitrobenzenes
作者:N. V. Zotova、P. M. Kushakova、V. A. Kuznetsov、A. A. Rodin、A. V. Garabadzhiu
DOI:10.1007/s11178-005-0146-6
日期:2005.2
The effect of substituents in position 2 on the reactivity of 2-alkylamino-4-chloronitrobenzenes in nucleophilic substitution by N-nucleophiles of various character was studied.