Ruthenium- and rhodium-catalyzed oxidative couplings between versatile directed aromatic C–H bonds and allylicalcohols have been achieved. This method provides efficient synthesis of functional β-aryl ketones and aldehydes in good to excellent yields, and the carbonyl group in the desired products was a significant synthon for organic synthesis.
Rhodium(III)-Catalyzed Oxidative C–H Alkylation of Aniline Derivatives with Allylic Alcohols To Produce β-Aryl Ketones
作者:Shrikant M. Khake、Naoto Chatani
DOI:10.1021/acscatal.2c00854
日期:2022.4.15
The Rh(III)-catalyzed C–H oxidative alkylation of aniline derivatives with readily available secondary allyl alcohols using a pyrimidine-directing group, leading to the production of β-aryl ketones, is described. A wide variety of functional groups are tolerated in the reaction. In the reaction with an allyl alcohol bearing a methyl group at the α-hydroxy carbon, such as but-3-en-2-ol (2a), a metal
描述了使用嘧啶导向基团的 Rh(III) 催化苯胺衍生物的 C-H 氧化烷基化与容易获得的仲烯丙醇,从而产生 β-芳基酮。反应中允许有多种官能团。在与在α-羟基碳上带有甲基的烯丙醇如丁-3-烯-2-醇( 2a )的反应中,不需要金属氧化剂。与此形成鲜明对比的是,当2a中的甲基被乙基、丙基、戊基和苯基取代时,不会发生反应。在这些情况下,必须添加 Ag 2 CO 3才能使反应顺利进行。机械实验表明2a作为烷基化试剂和氧化剂,通过 β-羟基消除来再生活性 Rh(III) 物种。相反,Ag 2 CO 3在与除2a以外的反应物的烯丙醇反应中需要再生活性 Rh(III) 物质。因此,催化剂再生步骤根据烯丙醇的结构而不同。