A general, facile, and efficient method is presented for the synthesis of 3-substituted
1,2,4-oxadiazoles from amidoximes and triethyl orthoformate. The procedure employs
an iron(III) chloride/l-proline catalytic system and the 3-substituted 1,2,4-oxadiazole products are obtained
in moderate to good yields.
Key words
1,2,4-oxadiazoles - iron(III) chloride -
l-proline - amidoximes - triethyl orthoformate