五个不同的α,α'-双(芳基)-2,3:5,6-双(六亚甲基)吡啶-氯化钴(II)络合物,[2,3:5,6- {C 5 H 10 C(NAr )} 2 C 5 HN] CoCl 2(Ar = 2,6-Me 2 C 6 H 3,Co1 ; 2,6-Et 2 C 6 H 3,Co2 ; 2,6- i -Pr 2 C 6 H 3,Co3 ; 2,4,6-Me 3 C 6 H 2,Co4 ; 2,6-Et 2 -4-MeC 6H 2,Co5),是通过在乙酸中通过一锅模板反应由α,α'-二氧代-2,3:5,6-双(六亚甲基)吡啶与相应的苯胺和氯化钴(II)反应而合成的。Co2和Co3的分子结构揭示了具有两个构象柔性的八元环的扭曲的方锥几何形状,这是配体流形的特征。在用甲基铝氧烷(MAO)或改性的MAO(MMAO)活化后,所有五种配合物均表现出对乙烯聚合的高催化活性(高达3.62×10 6 g PE mol
Ammonium iodide-promoted cyclization of ketones with DMSO and ammonium acetate for synthesis of substituted pyridines
作者:Xiaojun Pan、Qiao Liu、Liming Chang、Gaoqing Yuan
DOI:10.1039/c5ra07584j
日期:——
A simple and efficient method has been developed for the synthesis of symmetrical and unsymmetrical pyridines via NH4I-promoted cyclization of ketones with DMSO and NH4OAc. It was found that methyl ketones always gave selective formation of the unsymmetrical pyridine, while non-methyl ketones gave unpredictable results (symmetrical or non-symmetrical product only, or a mixture of the two). In addition