Cu(TFA)2-Catalyzed Oxidative Tandem Cyclization/1,2-Alkyl Migration of Enamino Amides for Synthesis of Pyrrolin-4-ones
摘要:
A novel Cu(TFA)(2)-catalyzed oxidative tandem cyclization/1,2-alkyl migration of readily available enamino amides for the synthesis of pyrrolin-4-ones has been developed. The reaction tolerates a wide range of functional groups and is a reliable method for the rapid synthesis of substituted pyrrolin-4-ones in high yields under mild conditions.
PIFA-Mediated Tandem Hofmann-Type Rearrangement and Cyclization Reaction of α-Acyl-β-aminoacrylamides: Access to Polysubstituted Oxazol-2(3<i>H</i>)-ones
An efficient and straightforward synthesis of polysubstituted oxazol-2(3H)-ones has been developed via a tandem Hofmann-type rearrangement and cyclization reaction of various α-acyl-β-aminoacrylamides mediated by phenyl iodine(III) bis(trifluoroacetate) (PIFA) in the presence of trifloroacetic acid (TFA). This novel protocol features readily available starting materials, mild reaction conditions, simple
Knorr; Taufkirch, Chemische Berichte, 1892, vol. 25, p. 768,774
作者:Knorr、Taufkirch
DOI:——
日期:——
Straightforward access to oxazaborines, diazaborinones and triazaborines by reactions of β-enaminoamides with 4-methylbenzenediazonium tetraphenylborate
The reaction of substituted beta-enaminoamides with 4-methylbenzenediazonium tetraphenylborate in dichloromethane produces besides the primary products of azo coupling reaction at the alpha-carbon atom of beta-enaminoamides, also mixtures of heterocyclic compounds of boron: 1,3,2 lambda(4)-oxazaborines, 1H-1,3,2 lambda(4)-diazaborine-4-ones and 4H-1,2,4,3 lambda(4)-triazaborines. Proportions of the products change depending on the reaction conditions, particularly depending on the presence or absence of base (sodium acetate) in the reaction mixture. The heterocyclic compounds were separated chromatographically and identified by means of X-ray, H-1, B-11, C-13 and N-15 NMR spectra and elemental analyses. (C) 2008 Elsevier B.V. All rights reserved.
Grohe,K.; Heitzer,H., Justus Liebigs Annalen der Chemie, 1973, p. 1018 - 1024
作者:Grohe,K.、Heitzer,H.
DOI:——
日期:——
Maggi; Arioli; Tamborini, Farmaco, Edizione Scientifica, 1969, vol. 24, # 3, p. 263 - 275