环吡啶鎓盐的 Ir 催化不对称氢化是一种方便有效合成手性吲哚里西啶的新策略。在[Ir(cod)Cl] 2和( R )-DM-SegPhos存在下,衍生自2-(2-酰基苯基)吡啶的环状吡啶鎓盐的不对称氢化反应顺利进行,得到所需的手性7,8-苯并吲哚里西啶6具有中等对映选择性(高达 86:14 er)和出色的非对映选择性(>20:1 dr),收率高至极好。通过重结晶,6j的对映体纯度提高到92:8。
Manganese-Catalyzed Direct Nucleophilic C(sp<sup>2</sup>)H Addition to Aldehydes and Nitriles
作者:Bingwei Zhou、Yuanyuan Hu、Congyang Wang
DOI:10.1002/anie.201506187
日期:2015.11.9
Herein, a manganese‐catalyzed nucleophilicaddition of inert C(sp2)H bonds to aldehydes and nitriles is disclosed by virtue of a dual activation strategy. The reactions feature mild reaction conditions, excellent regio‐ and stereoselectivity, and a wide substrate scope, which includes both aromatic and olefinic CH bonds, as well as a large variety of aldehydes and nitriles. Moreover, mechanistic studies
An efficient and direct ruthenium-catalyzed regioselective hydroxymethylation of (hetero)arenes via C-H activation with paraformaldehyde as a hydroxymethylating reagent is described. The corresponding products can be obtained in good to excellent yield. A number of aryl aldehydes can also be used in place of paraformaldehyde giving the desired alcohol products with similarly good results.
Rhodium(III)‐Catalyzed Aryl Borrowing Amination of Diaryl Methanols Containing Pyridine‐Directing Groups
作者:Zheng‐Qiang Liu、Jing Tao、Xin Zhuang、Chuan‐Ming Hong、Zhen Luo、Yu‐Fei Wu、Qing‐Hua Li、Tang‐Lin Liu
DOI:10.1002/adsc.202100772
日期:2021.12.7
The rhodium(III)-catalyzed aryl borrowing amination of various diaryl methanols with sulfonamides have been developed. The amination of alcohols via C−C bond activation is less developed and remains a challenge. These aryl borrowing reactions feature mild reaction conditions, good functional group tolerance, and compatibility with a wide range of alcohols, overall comprising an atom- and step-economic
Grignard-Type Arylation of Aldehydes via a Rhodium-Catalyzed CH Activation under Mild Conditions
作者:Luo Yang、Camille A. Correia、Chao-Jun Li
DOI:10.1002/adsc.201100232
日期:2011.5
An efficient Grignard‐type arylation of aldehydes via aryl CHactivation was achieved under mild conditions catalyzed by rhodium. The reaction provides an easy access to a wide variety of benzyl alcohols and can tolerate various functional groups as well as air and water.
Ruthenium(II)-Catalyzed Grignard-Type Nucleophilic Addition of C(sp<sup>2</sup>)–H Bonds to Unactivated Aldehydes
作者:Lidong Yang、Zezhao Liu、Tingyu Tang、Shibiao Tang、Bin Li、Baiquan Wang
DOI:10.1021/acs.joc.2c02039
日期:2022.11.4
The Grignard-type nucleophilicaddition of C(sp2)–H bonds to aldehydes catalyzed by high-oxidation-state transition metal complexes is limited to activated aldehydes. Herein, we report the first example of Grignard-type nucleophilicaddition of C(sp2)–H bonds to unactivated aldehydes catalyzed by high-oxidation-state ruthenium(II). The reaction has mild reaction conditions and good functional group