5-(4-Pyridyl)-1,3-dioxan-4,6-dione — Darstellung und Reaktionen mit O-, N- und C-Nucleophilen
✍ Scribed by Henning, Hans-Georg ;Stemplinger, Gunter ;Rothe, Kathrin
- Publisher
- John Wiley and Sons
- Year
- 1992
- Tongue
- English
- Weight
- 394 KB
- Volume
- 1992
- Category
- Article
- ISSN
- 0947-3440
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✦ Synopsis
5‐(4‐Pyridyl)‐1,3‐dioxan‐4,6‐diones — Preparation and Reactions with O‐, N‐ and C‐Nucleophiles
The reaction between alkyl chloroformates, pyridine and 1,3‐dioxane‐4,6‐diones yields 5‐[1‐alkoxycarbonyl‐4(1__H__)‐pyridylidene]‐1,3‐dioxane‐4,6‐diones 3 via the dihydro intermediates 2. The compounds 3 transfer the alkoxycarbonyl group readily to O‐, N‐ and C‐nucleophiles. Hydrolysis of 3a–e affords 2,2‐dimethyl‐5‐(4‐pyridyl)‐1,3‐dioxane‐4,6‐dione (4a), which in solution exists in the NH tautomeric form. Nucleophilic reagents attack 4a at one of the carbonyl groups to yield derivatives of (4‐pyridyl)acetic acid. These reactions admit a convenient access to a number of 4‐pyridyl‐substituted heterocycles.
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