An efficient copper-catalyzed formation of highly substituted pyrazoles using molecular oxygen as the oxidant
作者:Mamta Suri、Thierry Jousseaume、Julia J. Neumann、Frank Glorius
DOI:10.1039/c2gc35476d
日期:——
An efficient Cu-catalyzed formation of tetra-substituted pyrazoles is reported. In this atom economic process, readily available enamines and nitriles are reacted by C–C and N–N bond formation. Oxygen has been successfully used as the oxidant, which has important economic and environmental advantages. A broad scope of enamines and nitriles can be utilized in this process.
Efficient Synthesis of Pyrazoles: Oxidative CC/NN Bond-Formation Cascade
作者:Julia J. Neumann、Mamta Suri、Frank Glorius
DOI:10.1002/anie.201002389
日期:2010.10.11
Golden section: A novel synthetic strategy for the synthesis of tetrasubstituted pyrazoles is provided. In an efficient CC/NNbond‐formation cascade, enamines and nitriles are oxidatively coupled to deliver pyrazoles in good yields (see scheme). The ready availability of the starting materials, the high level of practicability of the reaction and work up, and the avoidance of hydrazine starting materials
黄金部分:提供了一种合成四取代吡唑的新颖合成策略。在有效的C CC / NN键形成级联反应中,烯胺和腈氧化偶联以高产率提供吡唑(请参阅方案)。起始原料的容易获得,反应和后处理的高度实用性以及避免使用肼起始原料,使得该方法具有吸引力。
PYRAZOLE SYNTHESIS BY COUPLING OF CARBOXYLIC ACID DERIVATIVES AND ENAMINES
申请人:Neumann Julia
公开号:US20130012715A1
公开(公告)日:2013-01-10
The invention describes a novel process for synthesizing pyrazoles by means of oxidative conversion of enamines with suitable N-containing carboxylic acid derivatives.
这项发明描述了一种通过氧化转化烯胺和适当的含氮羧酸衍生物合成吡唑的新方法。
Cu(II)-Catalyzed Enantioselective Conjugate Reduction for the Synthesis of<i>N</i>-Aryl<i>β</i>-Amino Acid Esters
A new set of reaction conditions has been established and allowed for the first non‐noble Cu(II)‐catalyzed asymmetric 1,4‐hydrosilylation of N‐aryl β‐enamino esters under air to afford a selection of N‐aryl β‐amino acid esters of moderate‐to‐good enantiopurities (ee up to 91%).