N-haloamidines. VII. 4-amino-5-chloroimidazoles and 4-amino-5-unsubstituted imidazoles from N-chloro-N′-arylbenzamidines and 1,1-diaminoethenes
作者:Elisabetta Rossi、Elena Pini
DOI:10.1016/0040-4020(96)00365-1
日期:1996.6
N-chloro-N′-arylbenzamidines react with 1,1-diaminoethenes to give in good yields 4-amino-5-chloroimidazoles. The behaviour of these compounds in some nucleophilic substitution reactions and their reduction to 4-amino-5-unsubstitutedimidazoles is reported.
Quinazolines by electrocyclic ring closure of 1,3-diaza-1,3-dienes
作者:Elisabetta Rossi、Giuseppe Celentano、Riccardo Stradi、Alberto Strada
DOI:10.1016/s0040-4039(00)94659-8
日期:1990.1
N-imidoyliminotripheny]phosphorane reacts with aliphatic and aromatic aldehydes to give an 1,3-diaza-1,3-diene intermediate 3,4-dihydro quinazolines and quinazolines. The ratio between the reaction products depends from the aldehyde employed.
A convenient room-temperature one-pot procedure for the preparation of benzimidazoles derivatives from N-arylamidines has been developed. The reaction of N-aryl-N'-chloro amidines, generated by the treatment of N-arylamidines with N-chlorosuccinimide, in presence of sodium hydroxide provides benzimidazoles in good to excellent yields. Nitrogen anion generated in situ from succinimide (by-product of the chlorination step using NCS) and hydroxide anion was found to be highly effective as Bronsted base to promote the cyclization into benzimidazole of N-aryl-N'-chloroamidine.
Synthesis and biological activity of novel antibacterial quinazolines
作者:Preet M.S. Bedi、V. Kumar、Mohinder P. Mahajan
DOI:10.1016/j.bmcl.2004.07.065
日期:2004.10
Novel quinazolines, having interesting antibacterial activity have been prepared, characterized and tested against a panel of susceptible and resistant Gram positive and Gram negative organisms. (C) 2004 Elsevier Ltd. All rights reserved.
Borovikova, G. S.; Tsymbal, I. F.; Levchenko, E. S., Journal of Organic Chemistry USSR (English Translation), 1984, p. 1626 - 1631
作者:Borovikova, G. S.、Tsymbal, I. F.、Levchenko, E. S.、Borovik, E. I.