An unprecedented enantioselective α‐functionalization of C4‐substituted N‐alkoxycarbonyl isoxazolidin‐5‐ones, readily available platforms from Meldrum's acidderivatives, by N‐sulfanylphthalimide (PhthSR) electrophiles was achieved upon an efficient phase‐transfer catalytic approach, mediated by a commercial N‐spiro quaternary ammonium catalyst. Two catalytic activities of the in situ formed R4N+Phth−
N-Thiolated β-lactam antibacterials: Effects of the N-organothio substituent on anti-MRSA activity
作者:Bart Heldreth、Timothy E. Long、Seyoung Jang、G. Suresh Kumar Reddy、Edward Turos、Sonja Dickey、Daniel V. Lim
DOI:10.1016/j.bmc.2006.01.029
日期:2006.6
importance of the N-organothio moiety on antibacterialactivity. Our results indicate that elongation of the N-alkylthio residue beyond two carbons, or extensive branching within the organothio substituent, diminishes antibacterialeffects. Of the derivatives we examined, the N-sec-butylthio beta-lactam derivative 5g possesses the strongest growth inhibitory activity against methicillin-resistant Staphylococcus
Electrochemical Direct Thiolation of Lactams with Mercaptans: An Efficient Access to
<i>N</i>
‐Acylsulfenamides
作者:Zhaoxin Wei、Renjie Wang、Yonghong Zhang、Bin Wang、Yu Xia、Ablimit Abdukader、Fei Xue、Weiwei Jin、Chenjiang Liu
DOI:10.1002/ejoc.202100924
日期:2021.9.7
A variety of N-acylsulfenamides are produced by the electrochemically enabled cross-coupling of readily available feedstocks under standard conditions. This protocol is practical and has wide substrate scope with good reaction efficiency (38 examples, up to 97 % yield). A possible free radical mechanism is preliminarily demonstrated.
Hydrochloric Acid-Promoted Intermolecular 1,2-Thiofunctionalization of Aromatic Alkenes
作者:Xiaomeng Li、Yunlong Guo、Zengming Shen
DOI:10.1021/acs.joc.7b03263
日期:2018.3.2
and different types of nucleophiles. Importantly, extension of nucleophiles can reach aryl ethers, indoles, and carboxylic acids with good reactivity. This practical and convenient method has broad substrate scope and high yields under metal-free and mild conditions. Furthermore, we achieved conversion and application for making sulfoxide and sulfone by oxidation.
Structural, Mechanistic, Spectroscopic, and Preparative Studies on the <i>Lewis</i>
Base Catalyzed, Enantioselective Sulfenofunctionalization of Alkenes
作者:Eduard Hartmann、Scott E. Denmark
DOI:10.1002/hlca.201700158
日期:2017.9
with the spectroscopic identification of putative thiiranium ion intermediates generated in the enantiodetermining step. The structural insights gleaned from these studies informed the design of new catalyst architectures to improve enantioselectivity. In addition, structural modification of the sulfenylating agents had a significant and salutary effect on the enantioselectivity of sulfenofunctionalization