2-Furancarboxylic acid, hydrazide → 5-(3-Chloro-phenyl)-3-(5-furan-2-yl-4-isobutyl-4H-[1,2,4]triazol-3-ylsulfanylmethyl)-[1,2,4]oxadiazole

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The title compound was synthesized according to the method described by Graybill et al. Tetrahedron lett. 2002 43, 5305-5309 from furan-2-carboxylic acid hydrazide (55.2 mg, 0.44 mmol), 1-isothiocyanato-2-methyl-propane (47 ml, 0.38 mmol) and 3-chloromethyl-5-(3-chloro-phenyl)-[1,2,4]oxadiazole (45.0 mg, 0.20 mmol) with P-BEMP (136 mg, 0.30 mmol) as base. Purification by flash chromatography (33-66% EtOAc in heptane) gave the product as an oil (12.7 mg, 15.6%). 1H NMR (CDCl3) d (ppm): 8.08 (s, 1H), 7.97 (d, 1H), 7.55 (d, 2H), 7.45 (t, 1H), 7.10 (d, 1H), 6.56 (d, 1H), 4.62 (s, 2H), 4.01 (d, 2H), 2.03 (m, 1H), 0.86 (d, 6H).

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