Synthesis of 1<i>H</i>-Indazoles from Imidates and Nitrosobenzenes via Synergistic Rhodium/Copper Catalysis
作者:Qiang Wang、Xingwei Li
DOI:10.1021/acs.orglett.6b00727
日期:2016.5.6
Nitrosobenzenes have been used as a convenient aminating reagent for the efficient synthesis of 1H-indazoles via rhodium and copper catalyzed C–H activation and C–N/N–N coupling. The reaction occurred under redox-neutral conditions with high efficiency and functional group tolerance. Moreover, a rhodacyclic imidate complex has been identified as a key intermediate.
Rh(III)-Catalyzed C–C/C–N Coupling of Imidates with α-Diazo Imidamide: Synthesis of Isoquinoline-Fused Indoles
作者:He Wang、Lei Li、Songjie Yu、Yunyun Li、Xingwei Li
DOI:10.1021/acs.orglett.6b01284
日期:2016.6.17
Imidate esters and diazo compounds have been established as bifunctional substrates for the construction of biologically active fused heterocycles viarhodium-catalyzed C–H activation and C–C/C–N coupling. This reaction occurs undermildconditions with high efficiency, step economy, and low catalyst loading.
Rh(III)-Catalyzed C–C Coupling of Diverse Arenes and 4-Acyl-1-sulfonyltriazoles via C–H Activation
作者:Miaomiao Tian、Bingxian Liu、Jiaqiong Sun、Xingwei Li
DOI:10.1021/acs.orglett.8b02078
日期:2018.8.17
4-Acyl-1-sulfonyltriazoles act as versatile carbene reagents in Cp*Rh(III)-catalyzed ortho-selective coupling with arenes via C–H activation. The coupling led to olefination with possible cyclization, depending on the nature of the arene.
Solid-phase synthesis of 1-substituted 4,5-dihydro-1,2,4-triazin-6-ones
作者:Blanca Martı́nez-Teipel、Enrique Michelotti、Martha J Kelly、Damian G Weaver、Francis Acholla、Kebede Beshah、Jordi Teixidó
DOI:10.1016/s0040-4039(01)01095-4
日期:2001.9
The solid-phase synthesis of 1-substituted 4,5-dihydro-1,2,4-triazin-6-ones from imidate esters and substituted hydrazines is reported. The synthesis starts with the reaction of imidic esters with polymer-bound glycine to form the imidate esters. A rehearsal library of 59 compounds was synthesized.
Access to Isoquinolines and Isoquinolin-3-ols via Rh(III)-Catalyzed Coupling/Cyclization Cascade Reaction of Arylimidates and Diazo Compounds
作者:Xing Guang Li、Min Sun、Qiao Jin、Kai Liu、Pei Nian Liu
DOI:10.1021/acs.joc.6b00264
日期:2016.5.6
A Rh(III)-catalyzed coupling/cyclization cascade reaction is described, which involves arylimidates and diazocompounds and proceeds via intermolecular C–C bond formation and subsequent intramolecular C–N bond formation. Mechanistic investigation revealed that the reaction is a two-step process: the initial Rh(III)-catalyzed coupling/cyclization proceeds very fast and the following dehydration is rather