Rh(III)-Catalyzed Acceptorless Dehydrogenative Coupling of (Hetero)arenes with 2-Carboxyl Allylic Alcohols
作者:Jintao Xia、Zhipeng Huang、Xukai Zhou、Xifa Yang、Feng Wang、Xingwei Li
DOI:10.1021/acs.orglett.7b03881
日期:2018.2.2
Rhodium(III)-catalyzed C–H activation of (hetero)arenes and redox-neutral coupling with 2-carboxyl allylic alcohols has been realized for the construction of β-aryl ketones. This reaction occurred efficiently at a relatively low catalyst loading via initialdehydrogenative alkylation to give a β-keto carboxylic acid, followed by decarboxylation.
2<i>H</i>-Chromene-3-carboxylic Acid Synthesis via Solvent-Controlled and Rhodium(III)-Catalyzed Redox-Neutral C–H Activation/[3 + 3] Annulation Cascade
作者:Zhi Zhou、Mengyao Bian、Lixin Zhao、Hui Gao、Junjun Huang、Xiawen Liu、Xiyong Yu、Xingwei Li、Wei Yi
DOI:10.1021/acs.orglett.8b01477
日期:2018.7.6
redox-neutral synthesis of 2H-chromene-3-carboxylic acids from N-phenoxyacetamides and methyleneoxetanones has been realized via a solvent-controlled and rhodium(III)-catalyzed C–H activation/unusual [3 + 3] annulation sequence. This transformation represents the first example of using an α-methylene-β-lactone unit as the three-carbon source in transition-metal-catalyzed C–H activationsthroughselective alkyl
Rh(III)‐Catalyzed C−H Activation of 2‐Aryl Quinazolinones and Coupling with 2‐Carboxyl Allylic Alcohols for the Synthesis of β‐Aryl Ketone Substituted Quinazolinones
An efficient strategy for access 2-(2-β-aryl ketone) substituted 2-arylquinazolinones was described. The reaction bewteen 2-aryl quinazolinones and 2-carboxyl allylic alcohols was catalyzed by [RhCp*Cl2]2-CF3COOAg through C−H activation and underwent facile decarboxylation, to give the corresponding 2-(2-β-aryl ketone) substituted phenyl quinazolinones in good to excellent yields with broad substrate
polarity and revealing expanded reactivity patterns. Through this analysis formalism, polarity matching has been established for Rh(III)-catalyzed N-amino-directed C–H coupling with 3-methyleneoxetan-2-ones, providing efficient access to 1,2-dihydroquinoline-3-carboxylic acids. The identified reaction, by virtue of the internal oxidative mechanism, showcases mild reaction conditions (room temperature),
Cascade synthesis of spirooxindole δ-lactone derivatives through N-aryl hydroxymethylacrylamides with xanthates
作者:Shucheng Wang、Xuhu Huang、Yanzhao Wen、Zemei Ge、Xin Wang、Runtao Li
DOI:10.1016/j.tet.2015.08.039
日期:2015.10
A novel and highly efficient cascade synthesis of spirooxindole delta-lactone derivatives from N-aryl hydroxymethylacrylamides and xanthates in good yields is described. The reaction proceeds through a radical addition/cyclization and ester exchange, in which two new C-C bonds and one C-O bond were formed. (C) 2015 Elsevier Ltd. All rights reserved.