An efficient method for the direct allylation of alkylhalides catalyzed by simple cobalt(II) bromide has been developed. This reaction, using a variety of substituted allylicacetates or carbonates, provides the linear product as the major product. It displays broad substrate scope and good functional group tolerance.
o-DPPB-Directed Copper-Mediated and -Catalyzed Allylic Substitution with Grignard Reagents
作者:Peter Demel、Manfred Keller、Bernhard Breit
DOI:10.1002/chem.200600225
日期:2006.8.25
explored as a directing leaving group in copper-mediated and copper-catalyzed allylicsubstitution with Grignardreagents. Complete control of chemo-, regio- and stereoselectivity with complete syn-1,3-chirality transfer was observed as a result of the directed nature of the reaction. No excess of organometallic reagent is required and the directing group can be recovered quantitatively. Coordination
Action d'organomagnesiens sur des sulfures et des sels de sulfonium allyliques catalysee par des sels cuivreux
作者:Y. Gendreau、J.F. Normant、J. Villieras
DOI:10.1016/s0022-328x(00)91810-2
日期:1977.12
Grignard reagents react with allylsulphides, in the presence of catalytic amounts of copper(I) salts, giving alkenes. The corresponding sulphonium salts react more rapidly. Allyic rearrangement cannot be completely avoided.
Ni-Catalyzed Alkylative Dimerization of Vinyl Grignard Reagents Using Alkyl Fluorides
作者:Jun Terao、Hiroyasu Watabe、Nobuaki Kambe
DOI:10.1021/ja042565r
日期:2005.3.1
Alkyl halides underwent unique cross-coupling reaction with vinylmagnesium chloride in the presence of Ni catalyst to give 2-alkyl-3-butenyl Grignardreagent (1) in high yields. This reaction proceeded efficiently at 25 degrees C in THF using primary and secondary alkylfluorides. On the other hand, PhCH=CHMgBr gave double alkylative vinyl coupling product 4 in good yield as the sole coupling product
Enantioselective Copper-Mediated Allylic Substitution with Grignard Reagents Employing a Chiral Reagent-Directing Leaving Group
作者:Bernhard Breit、Daniel Breuninger
DOI:10.1055/s-2004-831247
日期:——
Enantioselective copper-mediated allylic substitution with Grignard reagents was achieved employing the ortho-diphenylphosphanylferrocene carboxylate (o-DPPF) system as a planar chiral reagent-directing leaving group. Careful optimization of reaction parameters resulted in excellent regioselectivities and enantioselectivies of up to 95% ee.
利用邻二苯基膦酰二茂铁羧酸酯(邻DPPF)体系作为平面手性试剂导向离去基团,实现了铜介导的烯丙基取代格氏试剂的对映体选择性。通过对反应参数的精心优化,获得了极佳的区域选择性和高达 95% ee 的对映选择性。