A Type 1 Aldolase, NahE, Catalyzes a Stereoselective Nitro‐Michael Reaction: Synthesis of β‐Aryl‐γ‐nitrobutyric Acids
作者:Douglas J. Fansher、David R. J. Palmer
DOI:10.1002/anie.202214539
日期:2023.2
The stereoselective Michael addition of pyruvate to β-nitrostyrenes catalyzed by NahE, a type 1 aldolase, is reported. β-Aryl-γ-nitrobutyric acids can be isolated after oxidative decarboxylation in high yields on a preparative scale, providing access to precursors of γ-aminobutyric acid (GABA) analogues of demonstrated pharmacological activity.
Catalytic Asymmetric Conjugate Addition of Nitroalkanes to 4-Nitro-5-styrylisoxazoles
作者:Andrea Baschieri、Luca Bernardi、Alfredo Ricci、Surisetti Suresh、Mauroâ F.â A. Adamo
DOI:10.1002/anie.200905018
日期:2009.11.23
Nitro versus nitro: 4‐Nitro‐5‐styrylisoxazoles were used as masked α,β‐unsaturated carboxylic acids in the titled catalyticasymmetric transformation. The 4‐nitroisoxazole core acts as an activator of the conjugated alkene and a latent carboxylate functionality. The reaction proceeded with 5 mol % of a readily prepared phase‐transfer catalyst at room temperature with remarkable diastereo‐ and enantioselectivity