A convenient one-pot synthesis of 2-benzimidazolyl-thioacetophenones and thiazolo[3,2-a]benzimidazoles
作者:Abd El-Wareth A.O. Sarhan、Hasan A.H. El-Sherief、Abdalla M. Mahmoud
DOI:10.1016/0040-4020(96)00569-8
日期:1996.7
etophenones 3a-d. Which on cyclization yield thiazolo[3,2-a]-benzimidazoles 4a-d. Acetylation of 3a,d gave the N-acetyl derivatives 5a,d. Cyclization of 3a-d or 5d in acetic anhydride or acetic anhydride / pyridine mixture afforded 6a-d. While reaction of 1 with aliphatic or alicyclic ketones gave directly 2,3-disubstituted thiazolo[3,2-a]benzimidazoles 7a-f and 8a-d respectively.