Synthesis and application of chitosan supported vanadium oxo in the synthesis of 1,4-dihydropyridines and 2,4,6-triarylpyridines <i>via</i> anomeric based oxidation
作者:Maliheh Safaiee、Bahar Ebrahimghasri、Mohammad Ali Zolfigol、Saeed Baghery、Abbas Khoshnood、Diego A. Alonso
DOI:10.1039/c8nj02062k
日期:——
area electron diffraction (SAED), X-ray photoelectron spectroscopy (XPS) and inductively coupled plasma mass spectrometry (ICP-MS). The synthesized catalyst has been successfully used as a reusable catalyst in the synthesis of dihydropyridines and triarylpyridines.
An efficient and concise approach for the synthesis of 2,4,6-triphenyl pyridines has been developed through copper-catalysed oxidative decarboxylativecoupling of C(sp3) aryl acetic acids with oxime acetates in DMF at 150 °C under an oxygen atmosphere. Various functional groups were well tolerated and provided the corresponding 2,4,6-triphenyl pyridines in good to excellent yields.
The B(C6F5)3-catalyzed oxidativedeamination/cyclization cascade reaction of benzylamines and ketones for the construction of 2,4,6-triarylpyridines under metal-/solvent-free conditions has been successfully achieved. The advantages of this strategy include good functional group tolerance, low catalyst loading and high yields.
已成功实现了B(C 6 F 5)3催化的苄胺和酮的氧化脱氨基/环化级联反应,用于在无金属/无溶剂条件下构建2,4,6-三芳基吡啶。该策略的优点包括良好的官能团耐受性,低催化剂负载量和高收率。
An Efficient Synthesis of 2,4,6-Triarylpyridines by Use of Benzyl Halides under Neat Conditions
作者:Mehdi Adib、Neda Ayashi、Peiman Mirzaei
DOI:10.1055/s-0035-1560365
日期:——
An efficient synthesis of 2,4,6-triarylpyridines is described. Heating a mixture of an acetophenone, a benzyl halide, and ammonium acetate under neat conditions afforded the corresponding Krohnke pyridines in excellent yields.