Synthesis of 3- and 5-formyl-4-phenyl-1H-pyrazoles: promising head units for the generation of asymmetric imineligands and mixed metal polynuclear complexes
作者:Juan Olguín、Sally Brooker
DOI:10.1039/c0nj00774a
日期:——
-yl)-4-phenylpyrazole (18), synthesised from inexpensive phenylacetic acid, with formyl or hydroxymethyl groups was achieved by lithiation methods. The resulting monoaldehydes, 4-phenyl-5-pyrazole carbaldehyde (20) and 5-formyl-3-(2′-tetrahydropyranyloxymethyl)-4-phenyl-1-(tetrahydropyran-2-yl)pyrazole (28), should facilitate access to new, asymmetric, imine ligands based on a 4-phenyl-1H-pyrazole
报道了两种合成方法用于生成在3-和/或5-位被取代的4-苯基-1 H-吡唑。二甲基-4-碘-1-(四氢吡喃-2-基)-3,5-吡唑羧酸酯(10)的4位官能化以生成二甲基-4-苯基-1-(四氢吡喃-2-基)-3通过C–C Suzuki–Miyaura交叉偶联反应可得到1,5-吡唑羧酸酯(14)水。但是,该反应的收率低,导致我们开发了第二种方法,其中N-(四氢吡喃-2-基)-4-苯基吡唑(18),由廉价合成苯乙酸通过锂化方法获得具有甲酰基或羟甲基的化合物。产生的单醛4-苯基-5-吡唑甲醛(20)和5-甲酰基-3-(2'-四氢吡喃基氧基甲基)-4-苯基-1-(四氢吡喃-2-基)吡唑(28),应有助于获得基于4-的新的不对称亚胺配体苯基-1 H-吡唑部分。异金属四核配合物[Fe II(Ni II L 2)3 ](BF 4)2 ·溶剂的成功合成证明了这一点。同样地,醇分离途中28,N-(四氢吡喃-2