Catalytic Asymmetric Synthesis of Pyrroloindolines via a Rhodium(II)-Catalyzed Annulation of Indoles
作者:Jillian E. Spangler、Huw M. L. Davies
DOI:10.1021/ja4025337
日期:2013.5.8
Herein we report the synthesis of pyrroloindolines via a catalytic enantioselective formal [3+2] cycloaddition of C(3)-substituted indoles. This methodology utilizes 4-aryl-1-sulfonyl-1,2,3-triazoles as carbenoid precursors and the rhodium(II)-tetracarboxylate catalyst Rh2(S-PTAD)4. A variety of aryl-substituted pyrroloindolines were prepared in good yields and with high levels of enantioinduction
Harnessing the β-Silicon Effect for Regioselective and Stereoselective Rhodium(II)-Catalyzed C–H Functionalization by Donor/Acceptor Carbenes Derived from 1-Sulfonyl-1,2,3-triazoles
作者:Zachary J. Garlets、Huw M. L. Davies
DOI:10.1021/acs.orglett.8b00427
日期:2018.4.20
The regioselective and enantioselective intermolecular sp3 C–H functionalization of silicon-substituted alkanes was accomplished using Rh2(S-NTTL)4 with readily available 1-sulfonyl-1,2,3-triazoles as carbene precursors. These reactions generate a diverse array of stereodefined substituted silaalkanes.
Cascade Rh(<scp>ii</scp>) and Yb(<scp>iii</scp>) catalyzed synthesis of substituted naphthofurans <i>via</i> transannulation of <i>N</i>-sulfonyl-1,2,3-triazoles with β-naphthols
An efficient cascade Rh(II) and Yb(III) catalyzed transannulation of N-sulfonyl-1,2,3-triazoles with β-naphthols has been accomplished for the synthesis of substituted naphthofurans in good yields. The reaction involves the initial rhodium catalyzed insertion of azavinyl carbene into the O–H bond followed by ytterbium catalyzed annulative C–C bond formation and concomitant aerial oxidation. The developed
Arylation of Rhodium(II) Azavinyl Carbenes with Boronic Acids
作者:Nicklas Selander、Brady T. Worrell、Stepan Chuprakov、Subash Velaparthi、Valery V. Fokin
DOI:10.1021/ja3062453
日期:2012.9.12
A highly efficient and stereoselective arylation of in situ-generated azavinyl carbenes affording 2,2-diaryl enamines at ambient temperatures has been developed. These transition-metal carbenes are directly produced from readily available and stable 1-sulfonyl-1,2,3-triazoles in the presence of a rhodium carboxylate catalyst. In several cases, the enamines generated in this reaction can be cyclized