THE BEHAVIOR OF 5-(4-PYRIDYL)-2-THIONO-1,3,4-OXADIOAZOLE TOWARDS WITTIG-HORNER REAGENTS
✍ Scribed by Boulos, L. S.; Yakout, El-Sayed M. A.
- Book ID
- 127095183
- Publisher
- Taylor and Francis Group
- Year
- 1993
- Tongue
- English
- Weight
- 266 KB
- Volume
- 84
- Category
- Article
- ISSN
- 1042-6507
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## Abstract Wittig reagents (__1a–c__) react with N‐(phenylsulfonyl)‐1,4‐benzoquinone monoimine __2a__ to give adducts __3a__, __4a__, and __4b__. On the other hand, the reactions of __2b__ with the same ylides (__1a–c__) yield the new products __3b__, __6a__, and __6b__, respectively. Mechanisms a
4-Hydroxycoumarin (1) reacted with Wittig reagents (2) to give 4-benzoylmethylcoumarin (5A) or [3-(4-hydroxycoumarinyl)]carbonylmethylenetriphenylphosphorane (6) depending upon the nature of the phosphorus ylide used. Dialkyl phosphonates (3a,b) and trialkyl phosphites (4a,b) converted 1 into the re