Reduction of 4, 7??diphenyl??1, 2, 5??thia (oxa) diazolo [3, 4??c] pyridines affording 2, 5??diphenyl??3, 4??diaminopyridines and ring closure of the diamines to fluorescent …

…, K Takahashi, T Imura, M Tashiro

Index: Mataka, Shuntaro; Takahashi, Kazufumi; Imura, Tetsuro; Tashiro, Masashi Journal of Heterocyclic Chemistry, 1982 , vol. 19, p. 1481 - 1488

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Citation Number: 19

Abstract

Abstract Reduction of 4, 7-diphenyl-1, 2, 5-thia-(1a-i) and 1, 2, 5-oxadiazolo [3, 4-c] pyridines (3a and ce) gave 3, 4-diamino-2, 5-diphenylpyridines (2a-g), which were converted into the fluorescent triazolo [4, 5-c]-(5), 1, 2, 5-selenadiazolo [3, 4-c]-(6), imidazolo [4, 5-c] pyridines (8), and pyrido [5, 6-c] pyridines (11). In the reduction of 3a, c and e, 4, 5-dihydro [1, 2, 5] oxadiazolo [3, 4-c] pyridines (4a-c) were obtained.