Rhodium(III)‐Catalyzed Synthesis of Skipped Enynes via C(sp
<sup>3</sup>
)–H Alkynylation of Terminal Alkenes
作者:Franco Della‐Felice、Margherita Zanini、Xiaoming Jie、Eric Tan、Antonio M. Echavarren
DOI:10.1002/anie.202014877
日期:2021.3.8
The RhIII‐catalyzedallylicC−H alkynylation of non‐activated terminalalkenes leads selectively to linear 1,4‐enynes at room‐temperature. The catalytic system tolerates a wide range of functional groups without competing functionalization at other positions. Similarly, the vinylic C−H alkynylation of α,β‐ and β,γ‐ unsaturated amides gives conjugated Z‐1,3‐enynes and E‐enediynes.
Highly stereoselective conjugate β‐borylation, using a new chiral NHC‐based copper catalyst, has been achieved. The chiral NHC copper complex was prepared in gram scale and showed high enantioselectivity and activity (up to 10 000 turnovers at 100 ppm of catalyst loading). This method was employed in the synthesis of a chiral β‐borylated ester from simple unconjugated alkenes though an unprecedented
Ligand-enabled gold-catalyzed 1,2-heteroarylation of alkenes
作者:Akash G. Tathe、Chetan C. Chintawar、Vivek W. Bhoyare、Nitin T. Patil
DOI:10.1039/d0cc03707a
日期:——
By adopting the interplay between ligand-enabled Au(I)/Au(III) catalysis and the unique π-activation mode of gold complexes, a highly coveted 1,2-heteroarylation of alkenes has been accomplished. The present ligand-enabled approach not only circumvents the requirement for strong sacrificial oxidants or photocatalysts but also operates under mild reaction conditions by utilizing simple and non-prefunctionalized