NOUVELLE SYNTHÈSE DE [1,2-A]BENZIMIDAZOLO-1,3,5,2-TRIAZAPHOSPHORINES ET DE [1,2-A]BENZIMIDAZOLO-1,3,5,2- TRIAZAPHOSPHORINE-2-THIONES

Abstract

The condensation of N₁-benzimidazolyl amidines 1 with tris(dimethy- lamino)phosphine leads to the corresponding [1,2a]Benzimidazolo-1,3,5,2-triazaphosphorines 3 . The N₂-phosphoroamidine intermediates 2′ are isolated and yielded the corresponding cyclic compounds 4 upon heating. The oxidation by sulfur of the compounds 3 gives the thiooxide derivatives 4 .

The structure of these compounds is unambiguously confirmed by IR, ¹H, ³¹P, and ¹³C NMR spectroscopy and by MS for some products.

Keywords:

• [1,2a]benzimidazolo-1,3,5,2-triazaphosphorine-2-thiones
• [1,2a]benzimidazolo-1,3,5,2-triazaphosphorines
• N₁-benzimidazolyl amidines
• N₁-benzimidazolyl N₂-phosphoroamidines
• tris(dimethylamino)phosphine

Les auteurs remercient le Secrétariat d'Etat pour la Recherche Scientifique et Technique (SERST) LAB-CH02 pour le support financier.