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ChemInform Abstract: Versatile Route to Functionalized 1H-2-Benzothiopyrans and 1H-2-Naphthothiopyrans by Electrophilic Cyclization of Bis(arylmethylthio)acetylenes: 2-Benzo- and 2-Naphthothiopyrylium Salts.

✍ Scribed by T. R. KLEIN; M. BERGEMANN; N. A. M. YEHIA; E. FANGHAENEL

Publisher
John Wiley and Sons
Year
2010
Weight
37 KB
Volume
29
Category
Article
ISSN
0931-7597

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✦ Synopsis

Versatile

Route to Functionalized 1H-2-Benzothiopyrans and 1H-2-Naphthothiopyrans by Electrophilic Cyclization of Bis(arylmethylthio)acetylenes: 2-Benzo-and 2-Naphthothiopyrylium Salts.

-Treatment of bis(arylmethylthio)acetylenes with ICl and sometimes with Br 2 results in efficient formation of thiopyrans. The ring closure of the derivative (IIIf) proceeds with high regioselectivity. The thiopyrans and their salts are pharmacologically and synthetically important compounds. -

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