Silver-Catalyzed 1,3-Dipolar Cycloaddition of Azomethine Ylides with β-Boryl Acrylates
作者:Ana López-Pérez、Marwin Segler、Javier Adrio、Juan C. Carretero
DOI:10.1021/jo1024915
日期:2011.3.18
The Ag-catalyzed 1,3-dipolar cycloaddition of (E)-beta-borylacrylates with azomethine ylides is described. The resulting 3-borylpyrrolidine derivatives were obtained in high yields and complete endo selectivities using AgOAc/dppe as catalyst system and B(dam) as boryl group. Transformation of the B(dam) group into pinacol borane and oxidation afforded 3-hydroxyproline derivatives in high yields.
Lee, Jack Chang Hung; Hall, Dennis G., Journal of the American Chemical Society, 2010, vol. 132, p. 5544 - 5545
作者:Lee, Jack Chang Hung、Hall, Dennis G.
DOI:——
日期:——
Optimization of Reaction and Substrate Activation in the Stereoselective Cross-Coupling of Chiral 3,3-Diboronyl Amides
作者:Jack Chang Hung Lee、Ho-Yan Sun、Dennis G. Hall
DOI:10.1021/acs.joc.5b00991
日期:2015.7.17
acidity of the second boron group in these substrates plays a significant role in facilitating these otherwise challenging cross-coupling processes. β-Diboronyl esters may be successfully cross-coupled in excellent yield and enantiomeric excess with prior conversion of the pinacol boronate to the corresponding trifluoroborate salt. In contrast, a substrate bearing a Weinreb amide can undergo direct