Diversity Oriented Synthesis of Indoloazepinobenzimidazole and Benzimidazotriazolobenzodiazepine from<i>N</i><sup>1</sup>-Alkyne-1,2-diamines
作者:Ravi Kumar、Rajesh K. Arigela、Srinivas Samala、Bijoy Kundu
DOI:10.1002/chem.201502956
日期:2015.12.14
oriented synthesis of two N‐polyheterocycles indoloazepinobenzimidazole and benzimidazotriazolobenzodiazepine from a common N1‐alkyne‐1,2‐diamine building block is described. The approach involves sequential formation of benzimidazole through cyclocondensation and oxidation, which is followed by the formation of either an azepine ring (through alkyne activation and 6‐endo‐dig cyclization, 1,2‐migration
Cyclocondensation of n-(prop-2-yn-1-yl)- and n-(penta-2,4-diyn-1-yl)- o-phenylenediamines with phenyl isothiocyanate and carbon disulfide
作者:R. V. Novikov、N. A. Danilkina、I. A. Balova
DOI:10.1007/s10593-011-0831-z
日期:2011.9
nuclei simultaneously. FromN-(prop-2-yn-1-yl)-o-phenylenediamines containing an aryl substituent at the triple bond, and N-(penta-2,4-diyn-1-yl)-o-phenylenediamines 2-methylidene-2,3-dihydro[1,3]thiazolo[3,2-a]benzimidazoles are formed. The latter are readily isomerized under the action of base giving thiazolo[3,2-a]benzimidazoles. The cyclocondensation of N-(alk-2-yn-1-yl)-o-phenylenediamines with
Cyclocondensation of N-prop-2-ynyl-and N-pentadiynyl-o-phenylenediamines with phenyl isothiocyanate
作者:R. V. Novikov、M. E. Borovitov、I. A. Balova
DOI:10.1007/s10593-008-0068-7
日期:2008.4
Cyclocondensation of N-prop-2-ynyl-o-phenylenediamine with phenyl isothiocyanate leads to the formation of 1-(3-arylprop-2-ynyl)-2,3-dihydro-1H-benzimidazole-2-thiones. In the reactions of diacetylene derivatives - N-penta-2,4-diynyl-o-phenylenediamine - with phenyl isothiocyanate the formation of two heterocyclic nuclei occurs simultaneously to form [1,3]thiazolidino[3,2-a]benzimidazoles.