Reactions of Diazo Compounds with Alkenes Catalysed by [RuCl(cod)(Cp)]: Effect of the Substituents in the Formation of Cyclopropanation or Metathesis Products
作者:Marino Basato、Cristina Tubaro、Andrea Biffis、Marco Bonato、Gabriella Buscemi、Filippo Lighezzolo、Pamela Lunardi、Chiara Vianini、Franco Benetollo、Alessandro Del Zotto
DOI:10.1002/chem.200801211
日期:2009.1.26
The reaction of diazo compounds with alkenes catalysed by complex [RuCl(cod)(Cp)] (cod=1,5‐cyclooctadiene, Cp=cyclopentadienyl) has been studied. The catalytic cycle involves in the first step the decomposition of the diazo derivative to afford the reactive [RuCl(Cp)C(R1)R2}] intermediate and a mechanism is proposed for this step based on a kinetic study of the simple coupling reaction of ethyl diazoacetate
研究了络合物[RuCl(cod)(Cp)](cod = 1,5-环辛二烯,Cp =环戊二烯基)催化重氮化合物与烯烃的反应。催化循环在第一步中涉及重氮衍生物的分解,以提供反应性的[RuCl(Cp)C(R 1)R 2 }]中间体,并在动力学研究的基础上提出了该步骤的机理。重氮乙酸乙酯的简单偶联反应。在Ru卡宾在烯烃的存在中间的进化依赖于取代基的性质在两个重氮Ñ 2 C(R 1)R 2(R 1,R 2 =苯基,H; pH值,CO 2我; Ph,Ph; C(R 1)R 2=芴)和烯烃底物R 3(H)CC(H)R 4(R 3,R 4 = CO 2 Et,CO 2 Et; Ph,Ph; Ph,Me; Ph,H; Me,Br ; Me,CN; Ph,CN; H,CN; CN,CN)。记录到该配合物具有显着的反应活性,尤其是对不稳定的芳基重氮化合物和电子贫烯烃的反应。获得的结果表明,可以形成环丙烷