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ChemInform Abstract: Novel Polar Cycloaddition of 1,2-Thiazinylium Salt.

Hiroshi Shimizu,Takashi Hatano,Takayuki Matsuda,Tatsunori Iwamura

Cheminform（2010）

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Abstract
Dibenzo[c, e][1, 2]thiazinylium tetrafluoroborate underwent polar cycloaddition with several 1,3-butadienes to afford new sulfur-nitrogen-containing sulfonium heterocycles ill good yields. The cycloaddition with unsymmetrical 1,3-butadiene, isoprene afforded two regioisomeric adducts. Deprotonation of the cycloadduct underwent ring transformation to yield a pyrrole derivative. (C) 1998 Elsevier Science Ltd. All rights reserved.
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novel polar cycloaddition,salt
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