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Synthesis 2012(6): 920-926
DOI: 10.1055/s-0031-1289722
DOI: 10.1055/s-0031-1289722
PAPER
© Georg Thieme Verlag
Stuttgart ˙ New YorkSynthesis of 1,3-Dihydrobenzo[c]thiophene-imines via Tandem Reactions of o-(1-Alkynyl)benzamides and Lawesson’s Reagent
Weitere Informationen
Received
8 November 2011
Publikationsdatum:
27. Februar 2012 (online)
Publikationsverlauf
Publikationsdatum:
27. Februar 2012 (online)

Abstract
Metal-free, one-pot tandem reactions of o-(1-alkynyl)benzamides proceed smoothly in the presence of Lawesson’s reagent leading to 1,3-dihydrobenzo[c]thiophene-imine derivatives in moderate to excellent yields under mild conditions. The method is highly regiospecific for the o-(1-alkynyl)benzothioamide, and only the five-membered-ring product is generated via a 5-exo-dig cyclization involving the sulfur atom.
Key words
o-(1-alkynyl)benzothioamides - tandem reaction - Lawesson’s reagent - metal-free - heterocycles
- Supporting Information for this article is available online:
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