Journal of heterocyclic chemistry

Cyclocondensation of 3??amino??2??iminonaphtho [1, 2??d] thiazole with oxalic acid derivatives

KC Liu, BJ Shih, MK Hu

Index: Liu, Kang-Chien; Shih, Bi-Jane; Hu, Ming-Kuan Journal of Heterocyclic Chemistry, 1987 , vol. 24, p. 1729 - 1732

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Citation Number: 7

Abstract

Abstract Refluxing 3-amino-2-iminonaphtho [1, 2-d] thiazole (1) with diethyl oxalate (2a) in a 2: 1 molar ratio in dry pyridine provided 2, 2′-binaphtho [1′, 2′: 4, 5] thiazolo [3, 2-b][1, 2, 4] triazole (3). On the other hand, when 1 was treated with excess amount of 2a in dimethylformamide, it afforded ethyl naphtho [1′, 2′: 4, 5] thiazolo [3, 2-b][1, 2, 4] triazole-2- carboxylate (4a) on heating and ethyl N-(2-iminonaphtho [1, 2-d] thiazol-3-yl) oxamate (5) ...