4‐b]pyridines through a rhodium‐catalysed intermolecular cyclization of pyrazol‐5‐amine and cyclic 1,3‐diketone‐2‐diazo compounds, has been developed. A methyl carbon of N,N‐dimethylformamide (DMF) performed as a carbon‐hydrogen source for the construction of the pyridine ring. Various pyrazolo[3,4‐b]pyridine derivatives were obtained under mild conditions using air as the terminal oxidant.
已经开发了通过
铑催化的
吡唑-5-胺和环状1,3-二酮-2-重氮化合物与
吡唑并[3,4- b ]
吡啶的通道。N,N-二甲基甲酰胺(
DMF)的甲基碳是构成
吡啶环的碳氢源。在温和的条件下,使用空气作为末端氧化剂,可以得到各种
吡唑并[3,4- b ]
吡啶衍生物。