Selective Catalytic Synthesis of α-Alkylated Ketones and β-Disubstituted Ketones via Acceptorless Dehydrogenative Cross-Coupling of Alcohols
作者:Dipanjan Bhattacharyya、Bikash Kumar Sarmah、Sekhar Nandi、Hemant Kumar Srivastava、Animesh Das
DOI:10.1021/acs.orglett.0c04098
日期:2021.2.5
phosphine-free pincer ruthenium(III) catalyzed β-alkylation of secondaryalcohols with primary alcohols to α-alkylated ketones and two different secondaryalcohols to β-branched ketones are reported. Notably, this transformation is environmentally benign and atom efficient with H2O and H2 gas as the only byproducts. The protocol is extended to gram-scale reaction and for functionalization of complex vitamin E
prevalent in biologically active compounds and in pharmaceuticals. A ruthenium-catalyzed direct synthesis of β-disubstituted ketones by cross-coupling of two different secondary alcohols is reported. This new protocol was applied to the synthesis of variety of β-disubstituted ketones from various cyclic, acyclic, symmetrical, and unsymmetrical secondary alcohols. An amine–amide metal–ligand cooperation
assimilating to provide the cross-coupled products. Reactions are sensitive to steric hindrance. This new C-C bond forming methodology requires low catalyst load and catalytic amount of base. Notably, the reaction produces H2 and H2O as the only byproducts making the protocol greener, atom economical and environmentally benign.
Divergent Synthesis of Alcohols and Ketones via Cross‐Coupling of Secondary Alcohols under Manganese Catalysis
作者:Feixiang Sun、Jiamin Huang、Zhihong Wei、Conghui Tang、Weiping Liu
DOI:10.1002/anie.202303433
日期:2023.6.26
A manganese-catalyzed cross-coupling of two secondaryalcohols in a divergent synthesis of either γ-disubstituted alcohols or β-disubstituted ketones is herein reported. A wide range of different alcohols could undergo the cross-coupling process smoothly and furnish the corresponding products by using the same catalyst, with overall moderate to good yields.
Selective control of secondary alcohols upgrading using Ir-catalyzed cross-coupling strategy
作者:Siqi Yang、Zeye Lu、Jiale Ji、Qingshu Zheng、Tao Tu
DOI:10.1007/s11426-023-1843-8
日期:2024.3
The selective coupling of alcohols is a fascinating yet challenging approach for upgrading alcohols. Herein, we accomplished the controlled production of β-disubstituted ketones or upgraded secondaryalcohols via the Ir-catalyzed cross-coupling of secondaryalcohols in excellent yields with broad substrate scopes. This selective control was achieved by using an in-situ generated mono-NHC-Ir or a tris-NHC-Ir