Chiral Proton Catalysis: A Catalytic Enantioselective Direct Aza-Henry Reaction
作者:Benjamin M. Nugent、Ryan A. Yoder、Jeffrey N. Johnston
DOI:10.1021/ja031906i
日期:2004.3.1
during an enantioselectivereaction, this work represents the first example of this phenomenon outside of a protein. A chiral, nonracemic BisAMidine (BAM) ligand was designed, synthesized, and complexed to the proton of a Brønsted acid. The resulting coordination compound catalyzed the production of enantioenriched product from the combination of a Schiff base and nitroalkane (the aza-Henryreaction). This
A catalyticasymmetric nitro-Mannich (aza-Henry) reaction with rareearth metal/alkali metal heterobimetallic catalysts is described. A Yb/K heterobimetallic catalyst assembled by an amide-based ligand promoted the asymmetric nitro-Mannich reaction to afford enantioenriched anti-b-nitroamines in up to 86% ee. Facile reduction of the nitro functionality allowed for efficient access to optically active
描述了与稀土金属/碱金属异双金属催化剂的催化不对称硝基-曼尼希 (氮杂-亨利) 反应。由基于酰胺的配体组装的 Yb/K 杂双金属催化剂促进了不对称硝基-曼尼希反应,以提供高达 86% ee 的对映体富集的抗 b-硝基胺。硝基官能团的轻松还原允许有效获取光学活性 1,2-二胺。