Abstractmagnified imageChiral supramolecular metal‐organic frameworks assembled from copper complexes catalyse Henry and aza‐Henry reactions of aromatic and aliphatic aldehydes and N‐protected aromatic imines in high yield and good to excellent enantioselectivity. Reactions can be performed in the absence of base in ethanol or water.
Abstractmagnified imageChiral supramolecular metal‐organic frameworks assembled from copper complexes catalyse Henry and aza‐Henry reactions of aromatic and aliphatic aldehydes and N‐protected aromatic imines in high yield and good to excellent enantioselectivity. Reactions can be performed in the absence of base in ethanol or water.
Chiral Ammonium Betaines: A Bifunctional Organic Base Catalyst for Asymmetric Mannich-Type Reaction of α-Nitrocarboxylates
作者:Daisuke Uraguchi、Kyohei Koshimoto、Takashi Ooi
DOI:10.1021/ja8041004
日期:2008.8.1
A chiralammoniumbetaine, an intramolecular ion-pairing quaternary ammonium aryloxide 3, has been designed and its vast potential as an enantioselective organic base catalyst has been successfully demonstrated in the highly enantioselective direct Mannich-type reaction of alpha-substituted alpha-nitrocarboxylates 2 with various N-Boc imines 1. The present study provides a conceptually new approach
Chiral Proton Catalysis: Enantioselective Brønsted Acid Catalyzed Additions of Nitroacetic Acid Derivatives as Glycine Equivalents
作者:Anand Singh、Ryan A. Yoder、Bo Shen、Jeffrey N. Johnston
DOI:10.1021/ja068073r
日期:2007.3.1
unsymmetrical, bifunctional chiral proton catalyst (2) has been developed to enable the highly diastereo- and enantioselective synthesis of epimerizable addition products from nitroacetic acid esters. The strategy is analogous to O'Donnell's glycine Schiff base alkylations that have been broadly applied to the synthesis of α-amino acids. In this regard, nitroacetic acid esters provide complementary
Davis, Tyler A.; Wilt, Jeremy C.; Johnston, Jeffrey N., Journal of the American Chemical Society, 2010, vol. 132, p. 2880 - 2882
作者:Davis, Tyler A.、Wilt, Jeremy C.、Johnston, Jeffrey N.
DOI:——
日期:——
Versatile Supramolecular Copper(II) Complexes for Henry and Aza-Henry Reactions
作者:Guoqi Zhang、Eiji Yashima、Wolf-D. Woggon
DOI:10.1002/adsc.200900069
日期:2009.6
Abstractmagnified imageChiral supramolecular metal‐organic frameworks assembled from copper complexes catalyse Henry and aza‐Henry reactions of aromatic and aliphatic aldehydes and N‐protected aromatic imines in high yield and good to excellent enantioselectivity. Reactions can be performed in the absence of base in ethanol or water.