Ti/Ni-Mediated Inter- and Intramolecular Conjugate Addition of Aryl and Alkenyl Halides and Triflates
作者:Irene R. Márquez、Delia Miguel、Alba Millán、M. Luisa Marcos、Luis Álvarez de Cienfuegos、Araceli G. Campaña、Juan M. Cuerva
DOI:10.1021/jo402626u
日期:2014.2.21
extent, chlorides and triflates to α,β-unsaturated carbonyls at room temperature, without requiring the previous formation of an organometallic nucleophile. The reaction proceeds inter- and intramolecularly with good functional group compatibility, which is key for the development of free protecting group methodologies. Carbo- and heterocycles of five- and six-membered rings are obtained in good yields.
在这项工作中,我们表明,镍催化剂和Cp 2 TiCl的独特组合可以在室温下直接共轭添加芳基和链烯基碘化物,溴化物,并在较小程度上将氯化物和三氟甲磺酸盐生成α,β-不饱和羰基。 ,而无需事先形成有机金属亲核试剂。该反应在分子间和分子内以良好的官能团相容性进行,这是开发自由保护基方法的关键。五元环和六元环的碳环和杂环以高收率获得。此外,从循环伏安法,UV-vis和HRTEM测量中获得了有关机理的一些见解。