One-pot three-component reaction of 3-(polyfluoroacyl)chromones with active methylene compounds and ammonium acetate: regioselective synthesis of novel RF-containing nicotinic acid derivatives
作者:Vyacheslav Ya. Sosnovskikh、Roman A. Irgashev、Mikhail I. Kodess
DOI:10.1016/j.tet.2008.01.076
日期:2008.3
Reactions of 3-(polyfluoroacyl)chromones with acetoacetamide and ethyl acetoacetate in the presence of ammonium acetate proceed at the C-2 atom of the chromone system with pyrone ring-opening and subsequent cyclization to 5-salicyloyl-2-methyl-6-(trifluoromethyl)nicotinamides, ethyl 5-salicyloyl-2-methyl-6-(trifluoromethyl)nicotinates, and ethyl 5-hydroxy-2-methyl-5-(polyfluoroalkyl)-5H-chromeno[4
在乙酸铵存在下,3-(聚氟酰基)色酮与乙酰乙酰胺和乙酰乙酸乙酯的反应在色酮系统的C-2原子处进行,且吡喃酮开环,随后环化为5-水杨酰基-2-甲基-6-(三氟甲基)烟酰胺,5-水杨酰基-2-甲基-6-(三氟甲基)烟酸酯和乙基5-羟基-2-甲基-5-(多氟烷基)-5 H-苯并[4,3 - b ]吡啶-3 -羧酸盐。与β-aminocrotononitrile相似的反应,得到5-羟基-2-甲基-5-(多氟烷基)-5 ħ -chromeno [4,3- b ]吡啶-3-甲腈。