Engaging Alkenyl Halides with Alkylsilicates via Photoredox Dual Catalysis
作者:Niki R. Patel、Christopher B. Kelly、Matthieu Jouffroy、Gary A. Molander
DOI:10.1021/acs.orglett.6b00024
日期:2016.2.19
Single-electron transmetalation via photoredox/nickel dual catalysis provides the opportunity for the construction of Csp3–Csp2 bonds through the transfer of alkyl radicals under very mild reaction conditions. A general procedure for the cross-coupling of primary and secondary (bis-catecholato)alkylsilicates with alkenyl halides is presented. The developed method allows not only alkenyl bromides and
imidazolium salts, γ-substituted allyl chlorides reacted with alkyl Grignard reagents to undergo substitution reactions in an SN2′-selective fashion, where the magnesium ate complexes [(N-heterocyclic carbene-MgR3)−(MgX)+] of imidazol-2-ylidenes or imidazol-4-ylidenes, generated in situ, were postulated as the active species. It was observed that the reactions with imidazol-4-ylidene catalysts were faster
在催化量的1,2-二取代或1,2,3-三取代的咪唑鎓盐的存在下,γ-取代的烯丙基氯与烷基格氏试剂反应,以S N 2'-选择性方式进行取代反应,其中假定将原位生成的咪唑-2-亚胺或咪唑-4-亚胺的镁盐配合物[(N-杂环卡宾-MgR 3)-(MgX)+ ]作为活性物质。观察到与咪唑-4-亚烷基催化剂的反应比与咪唑-2-亚烷基催化剂的反应更快。初步研究了使用手性咪唑盐的对映选择性催化。
Grignard allylic substitution reaction catalyzed by 1,2,3-triazol-5-ylidene magnesium complexes
Allylic chlorides and phosphates reacted with alkyl-Grignard reagent in an S(N)2'-selective manner in the presence of a catalytic amount of 1,2,3-triazol-5-ylidenes to provide a-branched alkenes. (C) 2013 Elsevier Ltd. All rights reserved.
Selective carbalumination of monosubstituted acetylenes by aluminocuprate reagents
作者:A. V. Kuchin、G. A. Tolstikov、N. I. Andreeva
DOI:10.1007/bf00959381
日期:1987.2
CAPORUSSO A. M.; GIACOMELLI G.; LARDICCI L., J. ORG. CHEM., 1979, 44, NO 9, 1495-1501