Direct catalytic asymmetric Mannich-type reaction of unmodified ketones utilizing the cooperation of an AlLibis(binaphthoxide) complex and La(OTf)3·nH2O
The first example of a direct catalyticasymmetric Mannich-type reaction using unmodified ketones and an aminomethyl ether is described. This was achieved by the cooperativecatalysis of a heterobimetallicasymmetric complex (AlLibis(binaphthoxide)) and La(OTf)3·nH2O.
Forming All‐Carbon Quaternary Stereocenters by Organocatalytic Aminomethylation: Concise Access to β
<sup>2,2</sup>
‐Amino Acids
作者:Kai Wang、Jianliang Yu、Ying Shao、Shengbiao Tang、Jiangtao Sun
DOI:10.1002/anie.202009892
日期:2020.12.21
The asymmetric synthesis of β2,2‐amino acids remains a formidable challenge in organic synthesis. Here a novel organocatalytic enantioselective aminomethylation of ketenes with stable and readily available N,O‐acetals is reported, providing β2,2‐amino esters bearing an all‐carbonquaternarystereogenic center in high enantiomeric ratios with a catalytic amount of chiral phosphoric acid. Typically,
Copper-Catalyzed Oxy-aminomethylation of Diazo Compounds with <i>N</i>,<i>O</i>-Acetals
作者:Jianliang Yu、Long Chen、Jiangtao Sun
DOI:10.1021/acs.orglett.9b00203
日期:2019.3.15
oxy-aminomethylation reaction of diazo compounds has been developed, providing the α-hydroxy-β2-amino acidderivatives with quaternary carbon centers in moderate to excellent yields. Importantly, the readily available N,O-acetals have been employed as efficient bifunctionalization reagents to react with copper carbene intermediates, leading to the concurrent incorporation of an alkoxy and an iminium group into one
Short and Scalable Total Synthesis of Myrioneuron Alkaloids (±)-α,β-Myrifabral A and B
作者:Dengpeng Song、Zhengshen Wang、Ruoming Mei、Weiwei Zhang、Donghui Ma、Dengyu Xu、Xingang Xie、Xuegong She
DOI:10.1021/acs.orglett.6b00005
日期:2016.2.19
alkaloids (±)-α,β-myrifabral A and B has been accomplished in only four steps from conveniently available starting materials. This short synthesis relied on the use of a key tandem Mannich/amidation reaction to rapidly construct the core framework and two carbon stereocenters. The synthetic route allows for large scale preparation of these promising natural products against the hepatitis C virus (HCV).