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Heterocycles with potential heterodienes. III. Synthesis and Cycloaddition of 4-Carbomethylen-3-methyl-1-phenyl-5-pyrazolones

✍ Scribed by Dr. G. Tacconi; A. Gamba Invernizzi; P. P. Righetti; Dr. G. Desimoni

Publisher: John Wiley and Sons
Year: 1980
Tongue: English
Weight: 260 KB
Volume: 322
Category: Article
ISSN: 1615-4150
DOI: 10.1002/prac.19803220503

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✦ Synopsis

Heterocyclen mit potentiellen Heterodienen. III. Synthese und Cycloaddition von 4‐Carbomethylen‐3‐methyl‐1‐phenyl‐5‐pyrazolen

4‐Carbomethylen‐3‐methyl‐1‐phenyl‐5‐pyrazolone (4a, 4b) entstehen aus 2‐Pyrazoline‐, 5‐dion 2 und Benzoylmethylen‐ bzw. Carbomethomethylen‐triphenylphoranen (3a bzw. 3b) durch Wittig‐Synthese. 4a, 4b wurden durch IR‐und NMR‐Spektren gekennzeichnet. Sie reagieren „in situ”︁ mit Ethylvinylether zu den eis und trans 2,3‐Dihydropyran [2,3‐c] pyrazolen 5a, b bsw. 6a, b

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