Nickel(0)-catalyzed cross coupling of aryl O-carbamates and aryl triflates with Grignard reagents. Directed ortho metalation-aligned synthetic methods for polysubstituted aromatics via a 1,2-dipole equivalent
摘要:
The first Ni(0)-catalyzed cross-coupling reactions of aryl O-carbamates and aryl triflates with Grignard reagents (Scheme I) to give diversely polysubstituted aromatics 2d and 2e (Table I) which feature regiospecificity based on directed ortho metalation (carbamate), minimal beta-hydride elimination (triflate), and dependence on steric and electronic effects are described.
Nickel-Catalyzed Csp<sup>2</sup>–Csp<sup>3</sup>Bond Formation via C–F Bond Activation
作者:Yee Ann Ho、Matthias Leiendecker、Xiangqian Liu、Chengming Wang、Nurtalya Alandini、Magnus Rueping
DOI:10.1021/acs.orglett.8b02351
日期:2018.9.21
A nickel-catalyzed cross coupling of aryl fluorides via C–Fbondactivation has been developed. The alkylation method allows selective replacement of aryl fluorides by alkyl groups and enables the synthesis of diverse and otherwise difficult to access scaffolds in good yields.
Palladium-Catalyzed C(<i>sp</i><sup>3</sup>)–C(<i>sp</i><sup>2</sup>) Cross-Coupling of (Trimethylsilyl)methyllithium with (Hetero)Aryl Halides
作者:Dorus Heijnen、Valentín Hornillos、Brian P. Corbet、Massimo Giannerini、Ben L. Feringa
DOI:10.1021/acs.orglett.5b00905
日期:2015.5.1
The palladium-catalyzed direct cross-coupling of a range of organic chlorides and bromides with the bifunctional C(sp3)-(trimethylsilyl)methyllithium reagent is reported. The use of Pd-PEPPSI-IPent as the catalyst allows for the preparation of structurally diverse and synthetically versatile benzyl- and allylsilanes in high yields under mild conditions (room temperature) with short reaction times.
Nickel-Catalyzed Cross-Coupling of Anisoles with Alkyl Grignard Reagents via C–O Bond Cleavage
作者:Mamoru Tobisu、Tsuyoshi Takahira、Naoto Chatani
DOI:10.1021/acs.orglett.5b02200
日期:2015.9.4
Nickel-catalyzed cross-coupling of methoxyarenes with alkylGrignardreagents, which involves the cleavage of the C(aryl)–OMe bond, has been developed. The use of 1,3-dicyclohexylimidazol-2-ylidene as a ligand allows the introduction of a variety of alkyl groups, including Me, Me3SiCH2, ArCH2, adamantyl, and cyclopropyl. The method can also be used for the alkylative elaboration of complex molecules
已经开发了镍催化的甲氧基芳烃与烷基格氏试剂的交叉偶联,这涉及到C(芳基)-OMe键的裂解。使用1,3-二环己基咪唑-2-亚烷基作为配体允许引入各种烷基,包括Me,Me 3 SiCH 2,ArCH 2,金刚烷基和环丙基。该方法还可用于带有C(芳基)–OMe键的复杂分子的烷基化修饰。