Reaction of monocyclic ferrocenyl-4,5-dihydropyrazoles with β-dicarbonyl compounds
作者:E. I. Klimova、E. A. Vazquez Lopez、T. Klimova、M. Martinez Garcia、N. N. Meleshonkova、L. Ruiz Ramirez
DOI:10.1007/s11176-005-0106-4
日期:2004.12
Monocyclic 3- and 5-ferrocenyl-4,5-dihydropyrazoles with a free NH group in the molecule react with acetylacetone to form the corresponding enaminocarbonyl compounds. The latter were isolated as a single isomer, presumably E. 3-Ferrocenyldihydropyrazoles and 5-ferrocenyl-3-(p-methoxyphenyl)-4,5-dihydropyrazole analogously react with acetoacetic ester. 5-Ferrocenyl-3-phenyl-, 3-(p-bromophenyl)-5-ferrocenyl, and 3,5-diferrocenyl-4,5-dihydropyrazoles react with acetoacetic ester to form acetoacetylpyrazolides.
分子中含有一个游离 NH 基团的单环 3-和 5-二茂铁基-4,5-二氢吡唑与乙酰丙酮反应生成相应的烯氨羰基化合物。后者被分离为单一异构体,推测为 E。3-二茂铁基二氢吡唑和 5-二茂铁基-3-(对甲氧基苯基)-4,5-二氢吡唑与乙酰乙酸酯发生类似反应。5-二茂铁基-3-苯基-、3-(对溴苯基)-5-二茂铁基和 3,5-二茂铁基-4,5-二氢吡唑与乙酰乙酸酯反应生成乙酰乙酰吡唑烷。