efficient rongalite-mediated three-component radical annulation reaction to furnish fully substituted pyrazoles from aryldiazonium salts and α,β-unsaturated aldehydes or ketones under metal- and oxidant-free conditions at room temperature has been developed. In this transformation, aryldiazonium salts served as the precursor of both the aryl and aryl hydrazine units. Mechanistic investigations indicated
在室温下,在无
金属和无氧化剂的条件下,已经开发出了一种高效的由
锌铁矿介导的三组分自由基环化反应,可以从芳基重氮盐和α,β-不饱和醛或酮提供完全取代的
吡唑。在该转化中,芳基重氮盐用作芳基和芳基
肼单元的前体。机理研究表明,在反应过程中,白
云母可以同时起自由基
引发剂和还原剂的作用。