Continuous-flow synthesis of 3,5-disubstituted pyrazoles <i>via</i> sequential alkyne homocoupling and Cope-type hydroamination
作者:Sándor B. Ötvös、Ádám Georgiádes、Dániel Ozsvár、Ferenc Fülöp
DOI:10.1039/c9ra01590f
日期:——
A flow chemistry-based approach is presented for the synthesis of 3,5-disubstituted pyrazoles via sequential copper-mediated alkyne homocoupling and Cope-type hydroamination of the intermediary 1,3-diynes in the presence of hydrazine as nucleophilic reaction partner. The proposed multistep methodology offers an easy and direct access to valuable pyrazoles from cheap and readily available starting materials
提出了一种基于流动化学的方法,在肼作为亲核反应伙伴的情况下,通过顺序铜介导的炔烃同源偶联和中间 1,3-二炔的 Cope 型加氢胺化合成 3,5-二取代吡唑。所提出的多步骤方法提供了一种从廉价且容易获得的起始材料中轻松直接地获得有价值的吡唑的方法,而无需分离任何中间体。