Regioselective synthesis of multisubstituted isoquinolones and pyridones via Rh(<scp>iii</scp>)-catalyzed annulation reactions
作者:Liangliang Shi、Ke Yu、Baiquan Wang
DOI:10.1039/c5cc05977a
日期:——
A mild and efficient Rh(III)-catalyzedregioselective synthesis of isoquinolones and pyridones has been developed. The protocol uses readily available N-methoxybenzamide or N-methoxymethacrylamide and diazo compounds as the starting materials. The...
Regiocontrolled Coupling of Aromatic and Vinylic Amides with α-Allenols To Form γ-Lactams via Rhodium(III)-Catalyzed C–H Activation
作者:Zhi Zhou、Guixia Liu、Xiyan Lu
DOI:10.1021/acs.orglett.6b02903
日期:2016.11.4
rhodium(III)-catalyzed C–H activation has been demonstrated. This [4 + 1] annulationreaction provides an efficient method for the synthesis of isoindolinones and 1,5-dihydro-pyrrol-2-ones bearing a tetrasubstituted carbon atom α to the nitrogen atom with good functional group tolerance. The hydroxyl group in the allene substrate is essential in controlling the chemo- and regioselectivity of the reaction probably by
α-MsO/TsO/Cl Ketones as Oxidized Alkyne Equivalents: Redox-Neutral Rhodium(III)-Catalyzed CH Activation for the Synthesis of N-Heterocycles
作者:Da-Gang Yu、Francisco de Azambuja、Frank Glorius
DOI:10.1002/anie.201310272
日期:2014.3.3
α‐Halo and pseudohalo ketones are used for the first time as C(sp3)‐based electrophiles in transition‐metal‐catalyzed CHactivation and as oxidizedalkyneequivalents in RhIII‐catalyzed redox‐neutral annulations to generate diverse N‐heterocycles. This transformation is efficient and scalable. Due to the mild reaction conditions, a variety of functional groups could be tolerated.
Mild Rhodium(III)-Catalyzed Cyclization of Amides with α,β-Unsaturated Aldehydes and Ketones to Azepinones: Application to the Synthesis of the Homoprotoberberine Framework
作者:Zhuangzhi Shi、Christoph Grohmann、Frank Glorius
DOI:10.1002/anie.201301426
日期:2013.5.10
Seven! The title reaction can be described as an intermolecular annulation involving tandemCHactivation, cyclization to give the seven‐membered ring, and condensation steps. Biologically interesting azepinone derivatives can be prepared in this way. The synthetic potential of this method was demonstrated by the construction of the homoprotoberberine ring system.
Mild Rhodium(III)-Catalyzed C–H Allylation with 4-Vinyl-1,3-dioxolan-2-ones: Direct and Stereoselective Synthesis of (<i>E</i>)-Allylic Alcohols
作者:Shang-Shi Zhang、Jia-Qiang Wu、Ye-Xing Lao、Xu-Ge Liu、Yao Liu、Wen-Xin Lv、Dong-Hang Tan、Yao-Fu Zeng、Honggen Wang
DOI:10.1021/ol503229c
日期:2014.12.19
A rhodium(III)-catalyzed C–H direct allylation reaction with 4-vinyl-1,3-dioxolan-2-ones has been developed. The reaction provides a facile and stereoselective access to substituted-(E)-allylic alcohols under mild and redox-neutral reaction conditions. Olefinic C–H activation is applicable, giving multifunctionalized skipped dienes in good yields. Minimal double-bond migration was observed.