Synthesis of polycyclic nitrogen-containing heterocyclic: One pot formation of 1,6-naphthyridine ring system by reaction of amino-cyano-methylthio-heterocycles with dialkyl acetyeledicarboxylates
作者:Yoshinori Tominaga、Kenichi Nomoto、Noriko Yoshioka
DOI:10.1002/jhet.5570380518
日期:2001.9
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 lH-1,4,7-triazaphenalene-2,3,5,6,8,9-hexacarboxylate (5a). When one equivalent of DMAD was used in this reaction, dimethyl 4-amino-3-cyano-2-methylthiopyridine-5,6-dicarboxylate (3a),
在碳酸钾存在下,使3-氨基-3-甲硫基-2-氰基丙烯腈(1)与过量的乙炔基二羧酸二甲酯(DMAD)反应,生成新的三环杂环,六甲基l H -1,4,7-三氮杂萘-2,3,5,6,8,9-六羧酸盐(5a)。当在该反应中使用一当量的DMAD时,获得4-氨基-3-氰基-2-甲基硫代吡啶二甲基-5,6-二羧酸二甲酯(3a),其为5a的关键中间体。