Thermal condensation of substituted imidazoles with trifluoroacetaldehyde
作者:Shozo Fujii、Yasuo Maki、Hiroshi Kimoto、Louis A. Cohen
DOI:10.1016/s0022-1139(00)80517-5
日期:1986.8
The title condensation provides the corresponding (1′-hydroxy-2′,2′,2′-trifluoroethyl)imidazoles in yields dependent on the electronic nature of the substituent: ortho-para directors promote the reaction while meta directors retard it strongly. 1-Alkylimidazoles gave only 2-adducts. 2-Substituted imidazoles yielded 4(5)-adducts together with small amounts of 4,5-bis-adducts. 4(5)-Substituted imidazoles