Abstract
2,4-Bis(4-methoxyphenyl)-1,3,2,4-dithiadiphosphetane-2,4-disulphide (Lawesson's Reagent, LR) reacted with 4-amino-3-mercapto-5-(o-hydroxyphenyl and/or o-aminophenyl)-1,2,4-triazoles (1a and 2a) in boiling acetonitrile to afford s-triazolo(4,3-d)-1,3,4,2-benzo- oxadiazaphosphopine-6-sulphide (3a) and triazaphosphopine-6-sulphide (4a) derivatives, respectively. Compounds 3a and 4a were alkylated with methyl iodide, benzyl chloride, ethyl chloroacetate and/or chloroacetanilide to give the corresponding s-alkylated derivatives (3b-e and 4b-e, respectively). The structures of the products were proved chemically by the preparation via condensation of LR with the corresponding 3-alkylthio-4-amino-5-aryl-1,2,4-triazoles (1b-e and 2b-e). Also, the structures of all new compounds were elucidated on the basis of elemental analysis, IR, 1H-NMR, and MS spectra.
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