2,3-Dihydro-6-methoxycarbonyl-2,2-dimethyl-1,4-thiazin-3-one has been isolated from the reaction of 6-β-aminopenicillanic acid with sodium nitrite in methanolic hydrogen chloride. The mechanism of this rearrangement has been investigated and a pathway is proposed.
R. J. Stoodley, J. Chem. Soc. C, 1968, 2891 DOI: 10.1039/J39680002891
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