Highly enantioselective one-pot sequential synthesis of valerolactones and pyrazolones bearing all-carbon quaternary stereocentres
作者:Yan-Li Xu、Zhou-Zhou Qin、Yu-Xia Wang、Peng-Fei Zhao、Hong-Feng Li、Zhi-Hong Du、Chao-Shan Da
DOI:10.1039/d0ob02489a
日期:——
Highly enantiopure and bioactive δ-valerolactones and pyrazolones, bearing α-all-carbon quaternary stereocentres, were successfully and sequentially prepared via a one-pot procedure starting from readily available, inexpensive materials, catalysed by a new chiral squaramide under mild reaction conditions. An organocatalytic Michael reaction afforded the valerolactones, while a one-pot Michael-hydr
Highly diastereo- and enantioselective Mannich reaction of lactones with N-Boc-aldimines catalyzed by bifunctional rosin-derived amine thiourea catalysts
作者:Xianxing Jiang、Dan Fu、Gen Zhang、Yiming Cao、Luping Liu、Jingjing Song、Rui Wang
DOI:10.1039/c000621a
日期:——
A highly efficient diastereo- and enantioselective Mannichreaction of lactones with a variety of N-Boc-aldimines by using bifunctional rosin-derived amine thioureacatalysts was investigated for the first time, in general, affording the adducts bearing quaternary stereogenic centers with high levels of enantio- and diastereoselectivity (up to 99% ee, and >20:1 dr).
Organocatalytic enantioselective electrophilic amination of benzoyl butyrolactones
作者:Yan-Li Xu、Yu-Xia Wang、Gen-Fa Wen、Chao-Shan Da
DOI:10.1016/j.tetlet.2022.153745
日期:2022.4
Organocatalytic electrophilicamination of benzoyl butyrolactones with azodicarboxylates was demonstrated to highly efficiently prepare quaternary carbon stereocenter-bearing α-amino-γ-butyrolactones, key framework in numerous bioactive compounds. The squaramide C3 realized the highest yield (99%) and enantioselectivity (93%).