The formation of an interesting benzothiazine from the reaction of S-(o-halophenyl)-S-methyl sulfoximines in the presence of copper salts is reported. The overall yield is 27% over three steps from commercially available 2-halothioanisoles in the best case. The product's structure was confirmed by spectroscopic and X-ray crystal analysis. The benzothiazine shows fluorescent properties.
Keywords: Lithium / Metalation / Silicon / Carbanions / Density functional calculations Treatment of [2-(2-bromophenyl)allyl]trimethylsilane with tBuLi in THF at -78°C resulted in the rapid migration of the trimethylsilyl group to afford an allylic organolithium that can be easily trapped by a wide range of electrophiles. This
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