Triethylamine → HCID 78319100, compound

Participants

Reaction Steps

A mixture of N′-(4-chlorophenyl)thiophene-2-carbohydrazide (20 g, 79.3 mmol), triethylamine (10 mL) and carbonyldiimidazole (16.2 g, 100 mmol) was refluxed in THF (100 mL) for 1 hour. The crude product obtained after the removal of the solvent was triturated with water, filtered, and dried, followed by recrystallization from ethyl acetate/hexanes to provide 3-(4-chloro-phenyl)-5-(thiophene-2-yl)-1,3,4-oxadiazol-2(3H)-one (18 g, 64.7 mmol, yield 81%). The HPLC purity of the final product was 99.9%. LC-MS [M+H] 279.9 (C12H7ClN2O2S+H, expected 279.72). The 1H-NMR spectrum was in accordance with the chemical structure.

Provenance & Evidence