A new and efficientnickel-catalyzed alkylation of CAr–O electrophiles with B-alkyl-9-BBNs is described. The transformation is characterized by its functional group tolerance and provides a practical and versatile access to various Csp2–Csp3 bonds through Csp2–O substitution, without the restriction of β-hydride elimination. Moreover, the advantage of the newly developed method was demonstrated in
描述了一种新的,高效的镍催化的C Ar –O亲电试剂与B-烷基-9-BBN的烷基化反应。该转变的特征在于其对官能团的耐受性,并通过C sp2- O取代为各种C sp2- C sp3键提供了实用而通用的访问途径,而没有消除β-氢化物的限制。此外,新开发方法的优势在选择性和顺序的C–O键激活过程中得到了证明。
Nickel-Catalyzed C–O Bond-Cleaving Alkylation of Esters: Direct Replacement of the Ester Moiety by Functionalized Alkyl Chains
作者:Xiangqian Liu、Jiaqi Jia、Magnus Rueping
DOI:10.1021/acscatal.7b00941
日期:2017.7.7
Two efficient protocols for the nickel-catalyzed aryl–alkyl cross-coupling reactions using esters as coupling components have been established. The methods enable the selective oxidative addition of nickel to acyl C–O and aryl C–O bonds and allow the aryl–alkyl cross-coupling via decarbonylative bond cleavage or through cleavage of a C–O bond with high efficiency and good functional group compatibility
Chemical Equivalent of Arene Monooxygenases: Dearomative Synthesis of Arene Oxides and Oxepines
作者:Zohaib Siddiqi、William C. Wertjes、David Sarlah
DOI:10.1021/jacs.0c02724
日期:2020.6.3
pathways of arenes in eukaryotes. The resulting areneoxides serve as versatile precursors to phenols, oxepines, or trans-dihydrodiol-based metabolites. Although such compounds have an important biological and chemical relevance, the lack of methods for their production has hampered access to their utility. Herein, we report a general arenophile-based strategy for the dearomative synthesis of arene oxides
作者:Lucas W. Hernandez、Ulrich Klöckner、Jola Pospech、Lilian Hauss、David Sarlah
DOI:10.1021/jacs.8b01726
日期:2018.4.4
We describe the development of an arenophile-mediated, nickel-catalyzed dearomative trans-1,2-carboamination protocol. A range of readily available aromatic compounds was converted to the corresponding dienes using Grignard reagents as nucleophiles. This strategy provided products with exclusive trans-selectivity and high enantioselectivity was observed in case of benzene and naphthalene. The utility
A Mild Ni/Cu-Catalyzed Silylation via C<i>–</i>O Cleavage
作者:Cayetana Zarate、Ruben Martin
DOI:10.1021/ja412107b
日期:2014.2.12
A Ni/Cu-catalyzed silylation of unactivated C-O electrophiles derived from phenols or benzyl alcohols is described. This transformation is characterized by its wide scope and mild conditions, providing a direct access to synthetically versatile silylated compounds. The protocol allows for the coupling of C(sp(2))-O and even C(sp(3))-O bonds with similar efficiency.