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Fused polycyclic nitrogen-containing heterocycles: VIII. Friedel-Crafts intramolecular cyclization of 5-phenylthiazole-4-carboxylic acids - A new route to indeno[2,1-d]thiazoles
Mamedov,Gubaidullin,Nurkhametova,Litvinov,Levin
, p. 534 - 542 (2004)
Friedel-Crafts intramolecular cyclization in the presence of polyphosphoric acid of 2-substituted 5-phenylthiazole-4-carboxylic acids, which are obtained by alkaline hydrolysis of the corresponding esters, leads to indeno[2,1-d]thiazoles. According to the
