Meldrum's acid has been found to be effectively acylated using the imidazolides of N‐protected glycines, X‐NHCH2COOH (X = ‐COPh, ‐COMe, ‐Z, ‐Boc, ‐COOMe and ‐COOEt). The corresponding C‐acylation compounds were isolated in high yields and were readily converted to the N‐protected tetramic acids. It was shown by pmr spectroscopy that these acids exist as the enol tautomers in DMSO‐d6 solution, whereas in deuteriochloroform solution both the enol and keto tautomers can be observed.
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