A simple and efficient method of iodine-mediated aminohalogenation-oxidation of fluorinated N’-propargyl amidines to synthesize 2-fluoroalkyl imidazole-5-carbaldehydes was developed. This method showed good functional group compatibility and wide substrate scope, as variety of substituted substrates proceeded smoothly to give the corresponding products in moderate to excellent yields. And this method was also suitable to unfluorinated substrates. Fluorinated allyl amidines used as starting materials, aminohalogenated products were obtained as the final products. Studies on the mechanism indicated that the carbonylation proceeded via 5-iodomethyl imidazole intermediate, and the carbonyl oxygen atom was demonstrated that originated from dioxygen.
本研究开发了一种简单高效的
碘介导的
氨基卤化-氧化
氟化 N'-
丙炔基脒合成 2-氟烷基
咪唑-5-羰基醛的方法。该方法具有良好的官能团兼容性和广泛的底物范围,各种取代的底物都能顺利合成相应的产物,收率从中等到极好。这种方法也适用于非
氟化底物。以
氟化烯丙基脒为起始原料,
氨基卤化产物为最终产物。机理研究表明,羰基化反应是通过 5-iodomethyl imidazole 中间体进行的,羰基氧原子来源于二氧。