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
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
Dimeric Manganese-Catalyzed Direct Nucleophilic Addition of C(sp<sup>2</sup>)–H Bonds to Inert Aldehydes
作者:Hongxin Liu、Junqin Peng、Bin Li、Baiquan Wang
DOI:10.1021/acs.joc.2c01908
日期:2022.11.4
An efficient direct nucleophilic addition reaction of C(sp2)–H bonds to aldehydes catalyzed by a dimeric manganese has been developed. This reaction has a broad range of substrates, and high yields were also obtained with inert aliphatic aldehydes as substrates. A dimeric Mn2(CO)8Br2 was proven to be a more efficient catalyst precursor than the monomeric Mn(CO)5Br.
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