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3,4-dibromo-2,5-bis-dicyanomethylene-1-(1-pyridinio)-3-cyclopentene-1-ides: Novel pyridinium ylides of the cylopentadiene series

✍ Scribed by Volker Figala; Thomas Geßner; Rudolf Gompper; Erich Hädicke; Stefan Lensky


Book ID
103406330
Publisher
Elsevier Science
Year
1993
Tongue
French
Weight
264 KB
Volume
34
Category
Article
ISSN
0040-4039

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✍ Risitano, Francesco ;Grassi, Giovanni ;Bruno, Giuseppe ;Nicolò, Francesco 📂 Article 📅 1997 🏛 John Wiley and Sons 🌐 English ⚖ 489 KB

## Abstract The reactions of (arylmethylene)isoxazol‐5‐ones 1 with pyridinium ylides 2 lead to the diastereoselective formation of olates 4. The reasons for the favored Michael addition and the unsuccessful subsequent cyclization to fused O‐heterocycles are discussed on the basis of X‐ray analysis