Nickel-Catalyzed Kumada Coupling of Benzyl Chlorides and Vinylogous Derivatives
作者:Rita Soler-Yanes、Manuel Guisán-Ceinos、Elena Buñuel、Diego J. Cárdenas
DOI:10.1002/ejoc.201403007
日期:2014.10
Kumada-type cross-coupling of functionalized benzyl and allyl chlorides with alkylmagnesium reagents were discovered. The use of Ni(acac)2–TMEDA (acac = acetylacetonate, TMEDA = N,N,N′,N′-tetramethyl-1,2-ethylenediamine) allows the presence of reactive functional groups on the electrophile. On the other hand, the use of diallyl ether was shown to provide fast coupling at low temperature with a low catalyst
发现了功能化苄基和烯丙基氯与烷基镁试剂的快速 Ni 催化 KumaDA 型交叉偶联的条件。Ni(acac)2-TMEDA(acac = 乙酰丙酮化物,TMEDA = N,N,N',N'-四甲基-1,2-乙二胺)的使用允许在亲电子试剂上存在反应性官能团。另一方面,二烯丙基醚的使用显示出在低温下以低催化剂负载提供快速偶联。该反应似乎遵循一个激进的途径。
Suzuki Coupling of Potassium Cyclopropyl- and Alkoxymethyltrifluoroborates with Benzyl Chlorides
作者:Virginie Colombel、Frederik Rombouts、Daniel Oehlrich、Gary A. Molander
DOI:10.1021/jo202686p
日期:2012.3.16
Efficient Csp3–Csp3 Suzuki couplings have been developed with both potassium cyclopropyl- and alkoxymethyltrifluoroborates. Moderate to good yields have been achieved in the cross-coupling of potassium cyclopropyltrifluoroborate with benzyl chlorides possessing electron-donating or electron-withdrawing substituents. Benzyl chloride was also successfully cross-coupled to potassium alkoxymethyltrifluoroborates
Evidence for the transition from SN to ET mechanism in the reaction of arene radical anion with alkyl halide evoked by the introduction of an electron withdrawing substituent into radical anion
作者:Elena V. Panteleeva、Tamara A. Vaganova、Vitalij D. Shteingarts、Isaak I. Bilkis
DOI:10.1016/0040-4039(95)01685-b
日期:1995.11
salts of benzonitrile and 1.4-dicyanobenzene radicalanions with cyclopropylmethyl bromide provides benzylcyclopropane, in the first case, and 4-alkyl- benzonitriles together with 2-alkyl-1,4-dicyanobenzenes containing both cyclopropylmethyl and it's isomeric 3-butenyl fragment, in the second case. These results provide evidence for the change of reaction mechanism from SN to ET.