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Inter- and intramolecular hetero diels-alder reactions, 39. Influence of phenylthio and alkylthio substituents on the reactivity of 1-Oxa-1,3-butadienes in hetero diels-alder reactions

✍ Scribed by Tietze, Lutz F. ;Fennen, Jens ;Wichmann, Jürgen

Publisher
Wiley (John Wiley & Sons)
Year
1992
Tongue
English
Weight
565 KB
Volume
125
Category
Article
ISSN
0009-2940

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## Abstract The hetero Diels‐Alder reaction of the enamino ketones 1b and 1c with ethyl vinyl ether (2) in dichloromethane to give the dihydropyrans 3b/4b and 3c/4c is studied at high pressure up to 5 kbar. The kinetics is measured by on‐line FT‐IR spectroscopy up to 3 kbar. The cycloadditions show