ChemInform Abstract: Cycloaddition of 2‐Acylmethyl‐1H‐benzimidazoles to 4‐Arylidene‐1,3‐oxazol‐5‐ones.

Abstract

Fused pyridine derivatives R 0450Cycloaddition of 2-Acylmethyl-1H-benzimidazoles to 4-Arylidene-1,3-oxazol--5-ones. -Cycloaddition of 2-phenacylbenzimidazole (I) to arylideneoxazolones (II) occurs regioselectively to afford previously unknown tetrahydropyridobenzimidazoles (III) in high yield. Analogous cycloaddition of 2-acetonylbenzimidazole (IV) is accompanied by a prototropic isomerization. -(DZVINCHUK, I. B.; LOZINSKII, M. O.; Chem. Heterocycl. Compd. (N. Y.) 43 (2007) 7, 850-855; Inst. Org. Chem., Acad. Sci. Ukr., Kiev 253094, Ukraine; Eng.) -H. Toeppel 12-156