Synthesis of polycyclic nitrogen-contain
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Yoshinori Tominaga; Kenichi Nomoto; Noriko Yoshioka
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Article
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2001
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Journal of Heterocyclic Chemistry
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English
⚖ 85 KB
## Abstract Reaction of 3‐amino‐3‐methylthio‐2‐cyanoacrylonitrile (1) with excess dimethyl acetylenedi‐carboxylate(DMAD) in the presence of potassium carbonate in dimethyl sulfoxide gave a novel tricyclic heterocycle, hexamethyl l__H__‐1,4,7‐triazaphenalene‐2,3,5,6,8,9‐hexacarboxylate (**5a**). Whe