Rhodium(II) Acetate‐Catalysed Cyclization of Pyrazol‐5‐amine and 1,3‐Diketone‐2‐diazo Compounds Using
<i>N</i>
,
<i>N</i>
‐Dimethylformamide as a Carbon‐Hydrogen Source: Access to Pyrazolo[3,4‐
<i>b</i>
]pyridines
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。
Rh-Catalyzed C–H activation/intramolecular condensation for the construction of benzo[<i>f</i>]pyrazolo[1,5-<i>a</i>][1,3]diazepines
A novel and mild Rh(iii)-catalyzed C-H activation/intramolecular condensation of 1-aryl-1H-pyrazol-5-amines with cyclic 2-diazo-1,3-diketones was developed, givingaccess to various important benzo[f]pyrazolo[1,5-a][1,3]diazepine scaffolds through sequential C-C/C-N bond formation in a one-pot procedure under additive- and oxidant-free conditions. Furthermore, 3-([1,1'-biphenyl]-2-ylamino)-2-ethoxycyclohex-2-enones