1-硝基-4-(1,2,3-三唑基/四唑基)苯与芳基乙腈在酒精介质中在过量碱存在下的反应产生了新的2,1-苯并恶唑。这些发现表明由于它们的电子缺陷特性,被唑环活化的硝基芳烃具有高反应活性。此外,发现在二取代的硝基芳烃中区域选择性地发生异恶唑环的环化。在1-(4-硝基苯基)-1-的情况下ħ四唑,四唑环裂解比σ更快ħ形成-adduct。 1 H -1,2,3-三唑-四唑-亲核取代-2,1-苯并恶唑-环化
Synthesis of 1-(R-Phenyl)-5-(R-Methyl)-1H-1,2,3-triazole-4-carboxylic Acids by One-Pot Tandem Reaction
摘要:
Substituted 1H-1,2,3-triazole-4-carboxylic acids were synthesized by a three-component reaction of arylazides, ethyl 4-chloro-3-oxobutanoate, and either O- or S-nucleophiles in the presence of a base catalyst. The reaction most probably proceeded as a [3+2] cyclocondensation reaction between arylazide and ethyl 4-chloro-3-oxobutanoate with the further nucleophilic substitution of chlorine in the chloromethyl group. Reaction optimization was performed to carry out the reaction with an O-nucleophile. Conditions were found under which diethyl 2,5-dihydroxyterephthalate (the product of self-condensation of two molecules of ethyl 4-chloro-3-oxobutanoate with the further oxidation by azide) was obtained.