Regio- and Diastereoselective Construction of α-Hydroxy-δ-amino Ester Derivatives via 1,4-Conjugate Addition of β,γ-Unsaturated N-Sulfonylimines
摘要:
A first example of 1,4-conjugate addition of beta,gamma-unsaturated N-sulfonylimines via the oxonium ylides trapping process was developed. This method afforded a novel and efficient access for the high regio- and diastereoselective construction of alpha-hydroxyl-delta-amino esters derivatives, which exhibit inhibitory activity on PTP1B and SIRT1 enzymes in vitro. The synthetic potentials and the biological activity of the resulting products were well demonstrated to be promising for drug discovery.
Regioselective copper-catalyzed aminoborylation of styrenes with bis(pinacolato)diboron and diazo compounds
作者:Jingfeng Huo、Yazhen Xue、Jianbo Wang
DOI:10.1039/c8cc07764a
日期:——
A Cu(I)-catalyzed aminoborylation reaction of styrenes is reported. In this transformation, diazo compounds are used as the electrophilicamination agent. The in situ generated benzylcopper species is trapped by the electrophilic nitrogen terminus of the diazo substrate to afford borylated hydrazones in a regioselective manner.
We have developed a novel method to synthesize α-diazoesters from α-hydrazonoesters with a catalytic amount of Cu(OAc)2 in acetonitrile. When the reaction was carried out under an argon atmosphere, the reaction stopped halfway, suggesting that this reaction required oxygen to reoxidize the catalyst. Since hydrazonoesters can be obtained by reduction of α-diazoesters with P(n-Bu)3 in diisopropyl ether
Electrosynthesis of Stabilized Diazo Compounds from Hydrazones
作者:Nour Tanbouza、Alessia Petti、Matthew C. Leech、Laurent Caron、Jamie M. Walsh、Kevin Lam、Thierry Ollevier
DOI:10.1021/acs.orglett.2c01803
日期:2022.7.1
An electrochemical synthesis of diazocompounds from hydrazones in yields as high as 99% was performed. This method was elaborated as a useful synthetic method and demonstrated on various diazocompounds (24 examples). Apart from exhibiting an efficiency that matched that of commonly used harsh and toxic chemical oxidants, this reaction is practically simple to set up, requires mild conditions, and