Synthetic Communications, 37, 10, 2007, 1715-1722
Synthesis of Ethyl 8-Aryl-8-hydroxy-3-oxo-8H[1,2,4]oxadiazolo-[3,4-c][1,4]thiazine-5-carboxylates by Ring-Expansion Rearrangement
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http://dx.doi.org/10.1080/00397910701265945