Isosteric expansion of the structural diversity of chiral ligands: Design and application of proline-based N,N′-dioxide ligands for copper-catalyzed enantioselective Henry reactions
作者:En Gao、Meng Li、Lili Duan、Lin Li、Yue-Ming Li
DOI:10.1016/j.tet.2019.130492
日期:2019.9
Chiral N,N′-dioxide catalysts were designed based on isosteric approach. Using l-Proline as the starting material, a variety of chiral N,N′-dioxide ligands were obtained via conventional functional group transformations and were utilized in asymmetricHenry reactions between nitromethane and aromaticaldehydes. Using the N,N′-dioxide-copper(II) complexes as the catalysts, asymmetricHenry reaction
Binaphthyl-Proline Hybrid Chiral Ligands: Modular Design, Synthesis, and Enantioswitching in Cu(II)-Catalyzed Enantioselective Henry Reactions
作者:Chao Yao、Yaoqi Chen、Chao Wang、Ruize Sun、Haotian Chang、Ruiheng Jiang、Lin Li、Xin Wang、Yue-Ming Li
DOI:10.1021/acs.joc.2c01127
日期:——
Chiral O–N–N tridentate ligands were designed from proline and BINOL. Their design strategy and performance were evaluated using a copper(II)-catalyzed asymmetric Henryreaction as a model. The desired β-nitroalcohols were obtained in up to 94% ee’s. Preliminary results suggested that the stereofacial selection of the reactions was mainly controlled by the chiral diamine moiety derived from proline