Enantio- and Diastereoselective Cu(II)-Catalyzed Conjugate Borylation/Michael Addition Cascade: Synthesis of Spiroindane Boronates was written by Khalse, Laxman Devidas;Gorad, Sachin S.;Ghorai, Prasanta. And the article was included in Organic Letters in 2022.Electric Literature of C2CuF6O6S2 This article mentions the following:
The authors report a Cu(II)-(S,S)-iPr-FOXAP-catalyzed borylative Michael/Michael addition cascade cyclization of unsym. dienone for the synthesis of highly substituted and functionalized all-C spiroindane boronates under mild conditions. Optically active spiroindanes bearing boronic ester were obtained with excellent yields and good to excellent enantioselectivities (≤97% ee) and diastereoselectivities (up to >20:1 dr). Scale-up synthesis of this method and synthetic transformations of spiroindane boronates are also illustrated. In the experiment, the researchers used many compounds, for example, Copper(II) trifluoromethanesulfonate (cas: 34946-82-2Electric Literature of C2CuF6O6S2).
Copper(II) trifluoromethanesulfonate (cas: 34946-82-2) belongs to copper catalysts. The evolution of transition metal catalysts has attained a stage of civilization that authorizes for an extensive scope of chemical bonds formation partners to be combined efficiently. Copper of different valence states can be used to catalyze the coupling reaction, especially the Ullmann coupling reaction. Electric Literature of C2CuF6O6S2
Referemce:
Copper catalysis in organic synthesis – NCBI,
Special Issue “Fundamentals and Applications of Copper-Based Catalysts”