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Intra- and intermolecular hetero-Diels-Alder reactions. 16. Stereospecificity in intramolecular hetero-Diels-Alder reactions of 2-benzylidene-1,3-dicarbonyl compounds

✍ Scribed by Tietze, Lutz F.; Bratz, Matthias; Machinek, Reinhard; Kiedrowski, Guenter V.


Book ID
127330144
Publisher
American Chemical Society
Year
1987
Tongue
English
Weight
377 KB
Volume
52
Category
Article
ISSN
0022-3263

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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