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Bioconjug Chem. 2019 May 15;30(5):1304-1308. doi: 10.1021/acs.bioconjchem.9b00188. Epub 2019 Apr 10.

Multistep Synthesis of 1,2,4-Oxadiazoles via DNA-Conjugated Aryl Nitrile Substrates.

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1
Center for Drug Discovery, Department of Pathology and Immunology , Baylor College of Medicine , Houston , Texas 77030 , United States.

Abstract

A multistep protocol for the synthesis of 3,5-disubstituted 1,2,4-oxadiazoles on DNA-chemical conjugates has been developed. A set of six DNA-connected aryl nitriles were converted to corresponding amidoximes with hydroxylamine followed by the O-acylation with a series of aryl and aliphatic carboxylic acids. After cyclodehydration of the O-acyl amidoximes by heating at 90 °C in pH 9.5 borate buffer for 2 h, the desired oxadiazole products were observed in 51-92% conversion with the cleavage of O-acylamidoximes as the major side-product. The reported protocol paves the way for the synthesis of oxadiazole core-focused DNA-encoded chemical libraries.

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