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。
Nickel-catalyzed reductive cleavage of aryl alkyl ethers to arenes in absence of external reductant
The reductive cleavage of the C-O bonds of arylethers has numerous potential in organic synthesis. Although several catalysts that can promote the reductive cleavage of arylethers have been...
Nickel-Catalyzed Formal Homocoupling of Methoxyarenes for the Synthesis of Symmetrical Biaryls via C–O Bond Cleavage
作者:Keisuke Nakamura、Mamoru Tobisu、Naoto Chatani
DOI:10.1021/acs.orglett.5b03151
日期:2015.12.18
A new method has been developed for the nickel-catalyzed homocoupling of methoxyarenes via C–O bond cleavage using a diboron reagent. The use of 1,3-dicyclohexylimidazol-2-ylidene as a ligand was found to be critical to the success of the reaction. This new method allows the synthesis of a wide range of biaryl compounds.
An ethericNegishicoupling: The first cross‐coupling reaction between aryl alkyl ethers and dianion‐type zincate reagents to afford biaryl compounds through selective cleavage of the ethericC(sp2)O bond was developed. Dianion‐type zincates showed excellent reactivity toward the aromatic ethersundermildconditions, with good functional group compatibility (see scheme).