我们在此报告了一种对映体富集的N-取代吡啶酮的催化合成方法。通过使用由 Carreira [P/烯烃] 配体生成的手性铱催化剂,烯丙醇与吡啶酮的分子间不对称烯丙基胺化顺利进行,具有优异的化学选择性、区域选择性和对映选择性 (>19:1 N / O , >19:1 b /l 和≥89% ee)。该反应是在温和条件下的动力学拆分过程,并且对吡啶酮和烯丙醇都显示出广泛的底物范围。这种方法的潜力通过仅 0.6 mol% 催化剂负载的克级反应和胺化产物向有用骨架的多种转化得到证明。
Highly Regio- and Enantioselective Synthesis of N-Substituted 2-Pyridones: Iridium-Catalyzed Intermolecular Asymmetric Allylic Amination
作者:Xiao Zhang、Ze-Peng Yang、Lin Huang、Shu-Li You
DOI:10.1002/anie.201409976
日期:2015.2.2
The first iridium‐catalyzed intermolecularasymmetric allylic amination reaction with 2‐hydroxypyridines has been developed, thus providing a highly efficientsynthesis of enantioenriched N‐substituted 2‐pyridone derivatives from readily available starting materials. This protocol features a good tolerance of functional groups in both the allylic carbonates and 2‐hydroxypyridines, thereby delivering
Enantioselective Palladium(II)-Catalyzed Formal [3,3]-Sigmatropic Rearrangement of 2-Allyloxypyridines and Related Heterocycles
作者:Alessandro Rodrigues、Ernest E. Lee、Robert A. Batey
DOI:10.1021/ol9025759
日期:2010.1.15
Enantioselectivepalladium(II)-catalyzed formal [3,3]-sigmatropic rearrangement of (E)- and (Z)-allyloxy substituted N-heterocycles generates N-allyl N-heterocyclic amides in good yields and high enantioselectivities (up to 96% ee). The chiral palladacycle COP-Cl (5 mol %) is used as a catalyst with silver(I) trifluoroacetate (10 mol %) at 35−45 °C. Examples of heterocycles synthesized include 2-pyridones