General Silver-Catalyzed Hydroazidation of Terminal Alkynes by Combining TMS-N<sub>3</sub> and H<sub>2</sub>O: Synthesis of Vinyl Azides
作者:Zhenhua Liu、Peiqiu Liao、Xihe Bi
DOI:10.1021/ol501661k
日期:2014.7.18
A general hydroazidation of unactivated alkynes using silver catalysis is reported. The reactions of diverse terminal alkynes with trimethylsilyl azide (TMS-N3) in the presence of H2O afforded the corresponding vinyl azides in good to excellent yields. This reaction has a broad substrate scope, good functional group tolerance, simple operation, and high reaction efficiency, thus providing an easy access
Organocatalytic Vinyl Azide-Carbonyl [3+2] Cycloaddition: High-Yielding Synthesis of Fully Decorated<i>N</i>-Vinyl-1,2,3-Triazoles
作者:Dhevalapally B. Ramachary、G. Surendra Reddy、Swamy Peraka、Jagjeet Gujral
DOI:10.1002/cctc.201601317
日期:2017.1.23
For the first time, an enolate‐mediated organocatalytic vinyl azide‐carbonyl [3+2] cycloaddition (OrgVACC) of various ketones/aldehydes with vinyl azides is reported. It is an efficient intermolecular reaction with excellent outcomes with reference to rate, yield, selectivity, operational simplicity, substrate scope, catalyst simplicity, and vast applications.
Visible-Light-Driven Synthesis of 4-Alkyl/Aryl-2-Aminothiazoles Promoted by In Situ Generated Copper Photocatalyst
作者:Wen-Long Lei、Tao Wang、Kai-Wen Feng、Li-Zhu Wu、Qiang Liu
DOI:10.1021/acscatal.7b02818
日期:2017.11.3
Room-temperature synthesis of 4-alkyl/aryl-2-aminothiazoles from vinyl azides and ammonium thiocyanate was accomplished with the aid of copper salts and blue LED irradiation. Mechanism investigation indicates that in situ-formed Cu(NCS)2– plays dual important roles in the reaction: (1) as the photocatalyst to activate vinyl azides, (2) as the Lewis acid catalyst to promote ring opening of 2H-azirines