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。
Direct Arylation/Alkylation/Magnesiation of Benzyl Alcohols in the Presence of Grignard Reagents via Ni-, Fe-, or Co-Catalyzed sp<sup>3</sup> C–O Bond Activation
作者:Da-Gang Yu、Xin Wang、Ru-Yi Zhu、Shuang Luo、Xiao-Bo Zhang、Bi-Qin Wang、Lei Wang、Zhang-Jie Shi
DOI:10.1021/ja307045r
日期:2012.9.12
Direct application of benzyl alcohols (or their magnesium salts) as electrophiles in various reactions with Grignardreagents has been developed via transition metal-catalyzed sp(3) C-O bond activation. Ni complex was found to be an efficient catalyst for the first direct cross coupling of benzyl alcohols with aryl/alkyl Grignardreagents, while Fe, Co, or Ni catalysts could promote the unprecedented
已经通过过渡金属催化的 sp(3) CO 键活化开发了苯甲醇(或其镁盐)在与格氏试剂的各种反应中作为亲电试剂的直接应用。发现 Ni 配合物是苯甲醇与芳基/烷基格氏试剂首次直接交叉偶联的有效催化剂,而 Fe、Co 或 Ni 催化剂可以促进苯甲醇在( n) 己基MgCl。这些方法提供了将苯甲醇转化为各种功能的直接途径。
A Nonsymmetric Pincer-Catalyzed Suzuki−Miyaura Arylation of Benzyl Halides and Other Nonactivated Unusual Coupling Partners
The catalytic activity of a PCN-type palladium pincer complex is evaluated in the construction of C(sp(2))-C C(sp(2)) and C(sp(2))-C(sp(3)) bonds by Suzuki-Miyaura cross-couplings employing nontypical subs such as benzyl halides, alpha-haloenones, or alkylboronic acids as coupling partners. Most of the reported reactions are achieved in aqueous media, with all of the advantages implied.