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2005
Benzopyran derivatives
R 0350
Efficient Synthesis of Functionalized 2-Carbamoylpyran-4-ones by Ring Transof 5-Alkylidene-2,5-dihydropyrrol-2-ones. — The title process shows
20- 131 formation
that a 1,3-diketone reacts easily with (II) to give (E)-configured 5-alkylidene-2,5-dihydropyrrol-2-ones. Treatment of the latter with an aqueous solution of HCl affords the
unexpected carbamoylpyran-4-ones which are of synthetic and pharmaceutical interest.
The best yields are observed for the bicyclic or tricyclic products. — (ANDERS, J. T.;
NGUYEN, V. T. H.; LANGER*, P.; Synlett 2004, 15, 2779-2781; Inst. Chem.
Biochem., Ernst-Moritz-Arndt-Univ., D-17487 Greifswald, Germany; Eng.) —
Steudel
2005
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