Efficient Synthesis of 5-Fluoroalkylated 1<i>H</i>-1,2,3-Triazoles and Application of the Bromodifluoromethylated Triazole to Prepare New<i>gem</i>-Difluorinated Triazole Compounds
作者:Shizheng Zhu、Weimin Peng
DOI:10.1055/s-2003-36784
日期:——
A series of 5-fluoroalkylated 1H-1,2,3-triazoles was prepared in good yield by the regiospecific 1,3-dipolar cycloaddition reaction of the (Z) ethyl 3-fluoroalkyl-3-pyrrolidino-acrylates with aryl or benzyl azides. In the cases of benzyl azides, addition of Na2CO3 was crucial for a high yield of the triazoles. The tetrakis(dimethylamino)ethylene (TDAE) promoted reaction of the bromo-difluoromethylated 1H-1,2,3-triazole with aldehyde afforded a new class of novel gem-difluorinated triazole compounds.
通过 3-氟烷基-3-吡咯烷丙烯酸(Z)乙酯与芳基或苄基叠氮化物的 1,3-二极环加成反应,制备了一系列 5-氟烷基化的 1H-1,2,3-三唑,收率很高。在苄基叠氮化物的情况下,加入 Na2CO3 是获得高产率三唑的关键。在四(二甲基氨基)乙烯(TDAE)的促进下,溴二氟甲基化的 1H-1,2,3-三唑与醛发生反应,生成了一类新型的宝石二氟化三唑化合物。