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An efficient, simple, and environmentally benign method for the synthesis of novel sulfanyl tetrazoles has been achieved by one-pot three-component reaction of phenacyl bromides/3-(2-bromoacetyl)coumarins with KSCN and NaN3 using [Bmim]BF4 ionic liquid. It could be reused and recycled for four runs without significant loss of product yield.

The alkylation of 5-cyano indazoles 2 in the presence of readily available imidizolium salts (ionic liquids) (Bmim)BF4 as phase transfer catalyst were performed to afford the regio isomers N1-and N2-(substituted alkyl)-5-cyano indazoles. The N1-alkylated cyano indazoles were converted to the corresponding N1-(substituted alkyl)-5-aminomethyl and 5-carbaldehydes 5(a-f) and 6(a-f).