Boron difluoride complexes of carbamoyl Meldrum's acids

5-[Hydroxy(aryl/alkylamino)methylene]-2,2-dimethyl-1,3-dioxane-4,6-diones react with BF3·Et2O in mild conditions leading to the formation of boron difluoride complexes of carbamoyl Meldrum's acids. The X-ray structure has been obtained for one representative complex. The obtained new compounds are air and moisture stable at standard ambient conditions and easily isolable.

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► The new type of carbamoyl Meldrum's acids derivatives have been revealed.
► The structure of the new compounds were confirmed with X-ray crystallography.
► Prepared complexes are stable and easily isolable.
► Other derivatives of Meldrum's acids was examined.