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Title: Novel synthesis and ring closure reactions of 3-hydrazino-1,2,4-triazolo[3,4-b]benzothiazole
Authors: Kapratwar, S B
Baheti, K G
Kuberkar, S V
Issue Date: Mar-2005
Publisher: CSIR
IPC CodeInt.Cl.7 C 07 D 277/62
Abstract: 3-Hydrazino-1,2,4-triazolo[3,4-b]benzothiazole 2 is prepared by heating 3-chloro-1,2,4-triazino[3,4-b]benzothiazole-4(H)-one 1 with hydrazine hydrate. This transformation takes place with decarbonylation resulting in ring contraction and simultaneous replacement of chlorine by hydrazino group. Compound 2 on heating independently with urea and carbon disulphide in the presence of alkali gave 3'-hydroxy 3 and 3'-mercapto-1,2,4-triazolo[4',5':1,5]-1,2,4-triazolo[3,4-b] benzothiazole 4 respect¬≠ively. Treatment of cold solution of 2 in phosphoric acid with sodium nitrite solution affords 1,2,3,4-tetra¬≠zolo[1',5':1,5]-1,2, 4-triazolo[3,4-b]benzothiazole 5. 3'-Aryl-1, 2, 4-triazolo[4',5':1,5]-1, 2, 4-triazolo[3,4-b] benzothiazoles 7a-e have been also prepared by the reaction of 2 with aryl aldehydes in the presence of acetic acid.
Page(s): 625-627
ISSN: 0975-0983(Online); 0376-4699(Print)
Source:IJC-B Vol.44B(03) [March 2005]

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