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
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
Intercepting the Banert cascade with nucleophilic fluorine: direct access to α-fluorinated <i>N</i>H-1,2,3-triazoles
作者:J. R. Alexander、P. V. Kevorkian、J. J. Topczewski
DOI:10.1039/d1cc01179k
日期:——
The treatment of propargylic azides with silver(I) fluoride in acetonitrile was found to yield α-fluorinated NH-1,2,3-triazoles via the Banert cascade. The reaction was regioselective and the products result from an initial [3,3] rearrangement. The reaction is demonstrated on >15 examples with yields ranging from 37% to 86%.
Photoredox-catalyzed oxytrifluoromethylation of allenes: stereoselective synthesis of 2-trifluoromethylated allyl acetates
作者:Ren Tomita、Takashi Koike、Munetaka Akita
DOI:10.1039/c7cc01759f
日期:——
We have developed novel oxytrifluoromethylation of aryl-substituted allenes by photoredox catalysis. The present photocatalytic system allows direct and stereoselective synthesis of 2-CF3-allyl acetates bearing tetrasubstituted CF3-alkene scaffolds in a single operation. The obtained CF3-allyl acetates can be applied to further functionalization as CF3-containing building blocks.
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.