Hydrazone-carboxylic acids undergo intramolecular cyclization in the presence of pivaloyl chloride, iPr(2)NEt, and catalytic DABCO to form a range of substituted fused tricyclic 2,3-dihydro-1,3,4-oxadiazoles in high yields.
The reaction tolerates various hydrazone‐carboxylic acid based substrates, and depending on the functional groups present the products are obtained in moderate to very high yields.
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