SCHEDULED MAINTENANCE
Multicolanic acid (3), and other 4-substituted tetronic acids (8), (9), (10), and (17) are conveniently synthesised from the corresponding unsubstituted parent compounds by protection of the enolic hydroxy-groups with pyrrolidine, and reaction of the carbanions of the resultant derivatives with either alkyl halides or aldehydes, followed by acid catalysed removal of the protecting groups.
S. C. M. Fell, J. Heaps and J. S. E. Holker, J. Chem. Soc., Chem. Commun., 1979, 81 DOI: 10.1039/C39790000081
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