Synthesis of Pyrimido[2,1-b]benzoxazolium, Pyrimido[2,1-b]benzothiazolium and Pyrimido[1,2-a]benzimidazolium Salts by Reaction of 3-Isothiocyanato-2-propeniminium Salts witho-Functionalized Anilines
摘要:
3-Isothiocyanato-2-propeniminium salts 1 react with o-phenylenediamine, o-aminophenol or o-aminothiophenol to give o-substituted 1-phenyl-2(1H)-pyrimidinethiones 4, which cyclize upon treatment with methyl iodide to afford pyrimido[2,1-b]benzoxazolium, pyrimido[2,1-b]benzothiazolium and pyrimido[1,2-a]benzimidazolium salts 5 (X = O, S or NH, respectively) by a new condensation reaction.
Riemer Beate, Liebscher Juergen, Synthesis, (1993) N 1, S 75-76
作者:Riemer Beate, Liebscher Juergen
DOI:——
日期:——
Synthesis of Pyrimido[2,1-<i>b</i>]benzoxazolium, Pyrimido[2,1-<i>b</i>]benzothiazolium and Pyrimido[1,2-<i>a</i>]benzimidazolium Salts by Reaction of 3-Isothiocyanato-2-propeniminium Salts with<i>o</i>-Functionalized Anilines
作者:Beate Riemer、Jürgen Liebscher
DOI:10.1055/s-1993-25799
日期:——
3-Isothiocyanato-2-propeniminium salts 1 react with o-phenylenediamine, o-aminophenol or o-aminothiophenol to give o-substituted 1-phenyl-2(1H)-pyrimidinethiones 4, which cyclize upon treatment with methyl iodide to afford pyrimido[2,1-b]benzoxazolium, pyrimido[2,1-b]benzothiazolium and pyrimido[1,2-a]benzimidazolium salts 5 (X = O, S or NH, respectively) by a new condensation reaction.