175ChemInform Abstract The oxadiazoles (VI) are synthesized from the hydrazides (III) by phosphorus oxychloride-induced cyclization and subsequent reaction with the sulfonamides (V).

ChemInform Abstract The indole derivative (V) is obtained from the N-cyanoethylaniline (III) by coupling with 1-benzoylethyl bromide (IV), followed by cyclodehydration in the presence of P2O5. Reduction of (V) yields the primary amine (VI) which is transformed into various N-substituted analogues as shown in the reaction scheme.

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