✦ LIBER ✦

Synthesis and reactions of n-methyl-4-(methylthio)thieno[2,3-d]-pyrimidinium salts

✍ Scribed by Hiroshi Maruoka; Fumi Okabe; Kenji Yamagata

Publisher: Journal of Heterocyclic Chemistry
Year: 2008
Tongue: English
Weight: 456 KB
Volume: 45
Category: Article
ISSN: 0022-152X
DOI: 10.1002/jhet.5570450543

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✦ Synopsis

Abstract

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Two methods for the preparation of N‐methyl‐4‐(methylthio)thieno[2,3‐d]pyrimidinium salts 6a,b and 13a,b are described. Treatment of 6a,b and/or 13a,b with active methylene compounds such as malononitrile and ethyl cyanoacetate in the presence of sodium methoxide caused nucleophilic addition followed by elimination of methanethiol, giving the corresponding N‐methyl‐4‐ylidenethieno[2,3‐d]‐pyrimidines 7a,b, 8a,b, 14a,b and 15a,b.

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