In this work, we disclose a new catalytic and highly chemoselective cross-Claisen condensation of esters. In the presence of TBSNTf2 as a non-metal Lewis acid, various esters can undergo cross-Claisen condensation to form β-ketoesters which are important building blocks. Compared with the traditional Claisen condensation, this process, employing silyl ketene acetals (SKAs) as carbonic nucleophiles
Triaryl-Substituted Divinyl Ketones Cyclization: Nazarov Reaction versus Friedel–Crafts Electrophilic Substitution
作者:Valerii Z. Shirinian、Andrey G. Lvov、Anton V. Yadykov、Liana V. Yaminova、Vadim V. Kachala、Ashot I. Markosyan
DOI:10.1021/acs.orglett.6b03023
日期:2016.12.16
triaryl-substituted divinyl ketones has been studied. It was found that the reaction pathway strongly depends on the nature of the aryl substituent at the α-position to the carbonyl group. An electron-rich aromatic substituent promotes the reaction to proceed through the intramolecular Friedel–Crafts electrophilicsubstitution giving dihydronaphthalene derivatives. In contrast, the presence of an electron-deficient
Visible-light-promoted aerobic metal-free aminothiocyanation of activated ketones
作者:Pan-Feng Yuan、Qing-Bao Zhang、Xiao-Ling Jin、Wen-Long Lei、Li-Zhu Wu、Qiang Liu
DOI:10.1039/c8gc02720j
日期:——
A direct, redox-neutral, highly atom-economical and metal-free aerobic method for the synthesis of multi-substituted olefins via simply coupling ammonium thiocyanate with activated ketones is described. A series of multi-substituted olefins could be easily and efficiently obtained in excellent yields by using low-toxicity and inexpensive ammonium thiocyanate as an amine and thiocyanate source, and
A compound reprsented by the following formula (I), its salts or nsolvates thereof capable of specifically or selectively expressig an antifungal activity in a broad spectrum based on the novel mechanism thereof of 1,6-β-glucan synthesis inhibition, and an antifungal agent containing any of them.