Synthesis of <i>N</i>-substituted quaternary carbon centers through KO<i>t</i>-Bu-catalyzed aza-Michael addition of pyrazoles to cyclic enones
作者:Subin Yoon、Sungbin Lee、Seung Hyun Nam、Hyejeong Lee、Yunmi Lee
DOI:10.1039/d2ob01634f
日期:——
This study reports an efficient and mild method for the synthesis of cyclic β-amino ketones containing N-substituted quaternary carbon centers via the KOt-Bu-catalyzed aza-Michael addition reaction of pyrazoles to β-substituted cyclic α,β-enones. The amination was promoted by KOt-Bu (3 mol%) at ambient temperature and a wide range of new and versatile β-pyrazolyl ketones were obtained in good yields
本研究报告了一种高效且温和的方法,通过KO t -Bu 催化的吡唑与β-取代的环状α、β-烯酮的氮杂-迈克尔加成反应,合成含有N-取代季碳中心的环状β-氨基酮。在环境温度下通过 KO t -Bu (3 mol%)促进胺化,并以良好的产率获得了范围广泛的新型多功能β-吡唑基酮。此外,KO t -Bu 催化的环状二烯酮与吡唑的一锅二聚反应通过还探索了 aza-1,6-共轭加法,然后是 aza-1,4-共轭加法。
Synthesis of β-Alkyl Cyclopentanones in High Enantiomeric Excess via Copper-Catalyzed Asymmetric Conjugate Reduction
作者:Yasunori Moritani、Daniel H. Appella、Valdas Jurkauskas、Stephen L. Buchwald
DOI:10.1021/ja0009525
日期:2000.7.1
US6465664B1
申请人:——
公开号:US6465664B1
公开(公告)日:2002-10-15
US6787655B2
申请人:——
公开号:US6787655B2
公开(公告)日:2004-09-07
[EN] ASYMMETRIC 1,4-REDUCTIONS OF AND 1,4-ADDITIONS TO ENOATES AND RELATED SYSTEMS<br/>[FR] REDUCTIONS ASYMETRIQUES 1,4 D'ENOATES ET ADDITIONS 1,4 ASYMETRIQUES A DES ENOATES ET SYSTEMES ASSOCIES
申请人:MASSACHUSETTS INST TECHNOLOGY
公开号:WO2001019761A2
公开(公告)日:2001-03-22
One aspect of the present invention relates to methods for the transition-metal-catalyzed asymmetric 1,4-addition of a nucleophile, e.g., hydride, to cyclic and acyclic enoates and enones. In certain embodiments of the methods of the present invention, the transition metal catalyst consists essentially of copper and an asymmetric bidentate biphosphine ligand.