Transition-metal chloride mediated addition reaction of diorganomagnesium to easily enolizable ketones
作者:Mutsumi Sada、Seijiro Matsubara
DOI:10.1016/j.tet.2011.02.009
日期:2011.4
is difficult to perform with Grignardreagent (RMgX) or with diorganomagnesium (R2Mg), because a deprotonation to form a magnesium enolate occurs predominantly. To avoid the prior enolization, a complex reagent of a transition-metal salt and R2Mg was examined: A combination of R2Mg with iron(II) chloride (FeCl2) or ytterbium(III) chloride (YbCl3) gave a complex reagent that can realize a nucleophilic
Samarium(II) triflate was readily prepared by the reaction of samarium(III) triflate with sec-butyllithium at room temperature in THF. Its reducing ability was examined by pinacol coupling of carbonyl compounds. Sm(OTf)2 mediated Grignard-type reaction in THF-HMPA effectively; alkylation and allylation of ketones or aldehydes by simple alkyl, allyl, and benzyl halides proceeded via organosamarium intermediates
三氟甲磺酸钐 (II) 很容易通过三氟甲磺酸钐 (III) 与仲丁基锂在室温下在 THF 中反应制备。通过羰基化合物的频哪醇偶联来检测其还原能力。Sm(OTf)2在THF-HMPA中有效介导格氏型反应;通过有机钐中间体通过简单的烷基、烯丙基和苄基卤化物对酮或醛进行烷基化和烯丙基化。
Iron(II) Chloride-mediated Addition of Dialkylmagnesium to Carbonyl Compounds
作者:Mutsumi Sada、Seijiro Matsubara
DOI:10.1246/cl.2008.800
日期:2008.7.5
Addition reactions to carbonyl compounds with a complex reagent, prepared from organomagnesium and iron(II) chloride, were examined. The reagent works as effective nucleophile to an easily enolizab...
研究了使用由有机镁和氯化铁 (II) 制备的复杂试剂与羰基化合物的加成反应。该试剂作为有效的亲核试剂可轻松烯醇化...
Catalytic reductive ring opening of epoxides enabled by zirconocene and photoredox catalysis
The reductive ring opening of epoxides is a powerful transformation to convert readily accessible epoxides into a diverse array of valuable alcohols, including pharmaceuticals, agrochemicals, and functional polymers. Although significant progress has been made, the established methods were limited to titanocene-catalyzed reactions. Herein, we report an unprecedented zirconocene-catalyzed ring opening