Efficient synthesis of benzimidazo[1,2-<i>a</i>]pyrimidinone derivatives<i>via</i>catalyst-free reactions of Baylis-Hillman acetates, alcohols, and amines with 2-aminobenzimidazole
Benzimidazo[1,2‐a]pyrimidinone and its derivatives were easily prepared in good to excellent yields via tandem reactions of 2‐aminobenzimidazole with Baylis–Hillmanacetates, alcohols, and amines without the use of catalyst and additive in one‐pot process. The method provided an efficient and facile route to the title fused heterocyclic compounds with different functional groups. J. Heterocyclic Chem
Catalyst-free tandem Michael addition-cyclization reactions in aqueous media for the synthesis of benzimidazo[1,2-a]pyrimidinone derivatives
作者:ChuanLi Ren、Yan Wang、Dong Wang、YongJun Chen、Li Liu
DOI:10.1007/s11426-010-4033-9
日期:2010.7
The catalyst-free reactions of Baylis-Hillmanalcohols (1a-i) with 2-aminobenzimidazole (2) in THF-H2O (1:4) were developed for the convenient and greener synthesis of benzimidazo[1,2-a]pyrimidinone derivatives (3a-i). The pesticidal activities of 3a-i were examined to investigate a new biological activity of the imidazo[1,2-a]pyrimidinone-type compounds.