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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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