Die ~Ketosultame 3 und 11 werden dumh Aldolkondensation zu den entspr.Alkylidenderivaten 4.5 bzw. U umgesetzt. Epoxidation von 5 und 12 Rihrt azin 7 bzw. zum 1.2-Thiazepin 14 isomerisieren.Synthesis of l&Thiazines and 1J-Thiazepines by Ring Expansion zu den Epoxyketomn 6 und 13, die mit Bortrifluhd-Ehm zum 13-m-The B-Ketosul*unes and l1 are into the corresponding alkylidene derivatives 4,5, and 12. Epoxidation of 5 and U leads to the epoxyketones 6 and 13 which isomerize by boron uifluoride etherate to 1-2-thiazine 7 and 1.2-thiazepine 14, respectively.
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