Controllable chemoselectivity in the coupling of bromoalkynes with alcohols under visible-light irradiation without additives: synthesis of propargyl alcohols and α-ketoesters
作者:Ke Ni、Ling-Guo Meng、Hongjie Ruan、Lei Wang
DOI:10.1039/c9cc04090k
日期:——
The chemoselectivity of visible-light-induced coupling reactions of bromoalkynes with alcohols can be controlled by simple changes to the reaction atmosphere.
可见光诱导的溴代炔与醇的偶联反应的化学选择性可以通过对反应气氛进行简单改变来控制。
Aerobic Oxidation of Propargylic Alcohols to α,β-Unsaturated Alkynals or Alkynones Catalyzed by Fe(NO3)3·9H2O, TEMPO and Sodium Chloride in Toluene
作者:Shengming Ma、Jinxian Liu、Xi Xie
DOI:10.1055/s-0031-1290811
日期:2012.5
practical aerobic oxidation of propargylic alcohols using Fe(NO3)3⋅9H2O, TEMPO and sodium chloride in toluene at room temperature was applied to various type of propargylic alcohols affording α,β-unsaturated alkynals or alkynones in good to excellent yields. This protocol could be applied in academic laboratories as well as in industrial-scale production. A practical aerobic oxidation of propargylic alcohols
Synthesis of Indenes by Tandem Gold(I)-Catalyzed Claisen Rearrangement/Hydroarylation Reaction of Propargyl Vinyl Ethers
作者:Antonia Rinaldi、Vittoria Langé、Enrique Gómez-Bengoa、Giovanna Zanella、Dina Scarpi、Ernesto G. Occhiato
DOI:10.1021/acs.joc.9b00646
日期:2019.5.17
The tandemgold(I)-catalyzed propargyl Claisen rearrangement/hydroarylation reaction of suitable propargyl vinyl ethers, followed by in situ reduction of the resulting carbonyl group, provides functionalized indenes in good to excellent yields. The reaction occurs at room temperature in dichloromethane in the presence of 3 mol % [IPrAuCl]/AgBF4 as the best catalytic system. Instead, cyclization of
Nickel-Catalyzed Directed Hydroarylation of Alkynes with Boronic Acids
作者:Luke E. Hanna、Mikhail O. Konev、Elizabeth R. Jarvo
DOI:10.1002/ejoc.201801494
日期:2019.1.10
Stereoselective synthesis of trisubstituted alkenes using a nickel catalyst under mild reaction conditions is reported. A propargylic carbamate serves as a directing group. Products are allylic carbamates that can undergo further transformation, for example, by copper‐mediated allylicsubstitution
We have achieved the nickel-catalyzed asymmetric propargylic amination of propargylic carbonates bearing an internal alkyne group. A wide variety of propargylic carbonates and N-methylaniline derivatives were tolerated under the reaction conditions, providing the corresponding chiral propargylic amines in up to 97% yield with up to 97% ee.