Ni<sup>I</sup>Catalyzes the Regioselective Cross-Coupling of Alkylzinc Halides and Propargyl Bromides to Allenes
作者:Rita Soler-Yanes、Iván Arribas-Álvarez、Manuel Guisán-Ceinos、Elena Buñuel、Diego J. Cárdenas
DOI:10.1002/chem.201603758
日期:2017.1.31
We describe the unprecedented formation of allenes by Ni‐catalyzed cross‐coupling of propargyl bromides with alkylzinc halides. The reaction regioselectivity is complementary to the previously reported formation of propargyl‐coupled compounds. Experiments support the formation of NiI complexes as the active species and the participation of radical intermediates. Kinetic studies showed that the reaction
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
Regioselective Iron‐Catalysed Cross‐Coupling Reaction of Aryl Propargylic Bromides and Aryl Grignard Reagents
作者:Inés Manjón‐Mata、M. Teresa Quirós、Elena Buñuel、Diego J. Cárdenas
DOI:10.1002/adsc.201901203
日期:2020.1.7
An iron‐catalysed Kumada‐type cross‐coupling reaction between aryl substituted propargylic bromides and arylmagnesium reagents has been developed. Propargylic coupling products were the main or only outcome, and propargyl/allene regioselectivity was shown to depend on the electronic nature of the substituents on the triple bond of the substrate and on the arylmagnesium halide. Best selectivities were
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
Iron-Catalyzed Coupling of Propargyl Bromides and Alkyl Grignard Reagents
作者:Pablo Domingo-Legarda、Rita Soler-Yanes、M. Teresa Quirós-López、Elena Buñuel、Diego J. Cárdenas
DOI:10.1002/ejoc.201800849
日期:2018.9.23
An iron‐catalyzed cross‐coupling reaction of propargyl bromides with alkylmagnesium reagents affords either allene‐ or propargyl‐coupled products in smooth conditions, and tolerates the presence of functional groups.