Reactions of isocyanates with compounds containing active methylene groups in the presence of triethylamine
作者:Yu. G. Gololobov、O. A. Linchenko、I. R. Golding、M. A. Galkina、I. Yu. Krasnova、I. A. Garbuzova、P. V. Petrovskii
DOI:10.1007/s11172-006-0129-y
日期:2005.10
Compoundscontainingactive methylene groups react with isocyanates of different structures in the presence of triethylamine to form functionally substituted amides.
transition-metal-free one-pot sequence for the synthesis of 3-peroxy-substituted oxindoles from readily prepared 2-cyano-2-diazo-acetamides is reported. The two-step tandem process includes a highly efficient thermal intramolecular C–H-carbene insertion followed by a tetrabutylammonium iodide (TBAI) catalyzed radical C3-peroxy-functionalization. The protocol provides easy access to a new class of 3-cyano-3-
environmentally benign PEG‐400 (PEG=poly(ethyleneglycol)) in the presence of Pd(OAc)2 and novel triazine‐derived multifunctional ligand L1, with which this reaction could afford the structurally diverse mono‐ and double allylated adducts in good to excellent yields as well as good chemo‐ and regioselectivity. In addition, this Pd/L1/PEG‐400 catalyst system could be recycled for five runs with good
Herein, we present a mild and efficient metal-free arylation of α-fluoro-α-nitroacetamides employing diaryliodoniumsalts. A broad range of diaryliodoniumsalts and α-fluoro-α-nitroacetamides containing sensitive functional groups was successfully employed in this protocol to yield the arylated products in good yields. The synthetic value of this novel protocol was further highlighted by extending