Intramolecular Diels-Alder reactions of 2(1H)-pyrazinones: Synthesis of new Furo/Pyrano-pyridinones and -pyridines
作者:Kris J. Buysens、Didier M. Vandenberghe、Suzanne M. Toppet、Georges J. Hoornaert
DOI:10.1016/0040-4020(95)00802-f
日期:1995.11
4-alkynyloxy side chain and 2(1H)-pyrazinones 9–10 carrying the corresponding 2- or 3-alkynyloxy(m)ethyl substituent are shown to undergo intramolecular Diels-Alder reaction. The formation of either fused pyridinones 13, 16, 20, 22 or 24 and/or pyridines 14, 17, 19 or 25 depends on the substitution pattern of the anchored pyrazinone and runs via the loss of either nitrile or isocyanate from the intermediate
Design and synthesis of novel type VI-like β-turn mimetics. Diversity at the i+1 and the i+2 position
作者:Wim M. De Borggraeve、Bie M.P. Verbist、Frederik J.R. Rombouts、Vijaykumar G. Pawar、Wim J. Smets、Laila Kamoune、Jo Alen、Erik V. Van der Eycken、Frans Compernolle、Georges J. Hoornaert
DOI:10.1016/j.tet.2004.09.054
日期:2004.12
In this paper, a synthetic approach for functionalised 5-aminopiperidinone-2-carboxylate (APC) systems as non-pro cis-peptide bond containing external beta-turn mimics is presented. The scope and limitations of the synthetic method are discussed and the potential turn inducing properties of a model compound are evaluated by means of molecular modelling and NMR analysis. (C) 2004 Elsevier Ltd. All rights reserved.
Sulfolene pyridinones as precursors for pyridinone ortho -quinodimethanes and their Diels–Alder adducts
作者:Tom C Govaerts、Ilse Vogels、Frans Compernolle、Georges Hoornaert
DOI:10.1016/s0040-4039(01)02275-4
日期:2002.1
2(1H)-Pyrazinones were converted into [3,4-b] and [3,4-c] sulfolene pyridinones 4 and 5, serving as precursors for the corresponding 3.4- and 5.6-dimethylene 2(1H)-pyridinone ortho-quinodimethanes. These were trapped by in situ reaction with dienophiles. Tethering of 4 also enabled intramolecular cycloaddition. (C) 2002 Elsevier Science Ltd. All rights reserved.
Synthesis of a conformationally restricted dipeptide analogue and its evaluation as a β-turn mimic
作者:Wim M De Borggraeve、Frederik J.R Rombouts、Erik V Van der Eycken、Suzanne M Toppet、Georges J Hoornaert
DOI:10.1016/s0040-4039(01)01080-2
日期:2001.8
Dichloropyrazinone 3 was converted into a conformationally restricted dipeptide analogue 8 by means of a Diels–Alder strategy. The β-turn characteristics of molecule 8 were examined by molecular modeling and NMR spectroscopy.