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Polar cycloaddition of monocyclic 1,2-thiazinylium salt and transformation of the cycloadducts to 1,2-azathiabenzenes

✍ Scribed by Hiroshi Shimizu; Takashi Hatano; Takayuki Matsuda; Tatsunori Iwamura

Book ID
111714459
Publisher
Elsevier Science
Year
1999
Tongue
French
Weight
226 KB
Volume
40
Category
Article
ISSN
0040-4039

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Novel Polar Cycloaddition of 1,2-Thiazinylium Salt. -Treatment of the thiazine 5-oxide (I) according to A) affords a thiazinylium tetrafluoroborate which undergoes cycloaddition with the butadienes (II) and (V) to give heterocyclic adducts. Ring transformation of cycloadduct (IIIa) yields the pyrrol