4-Hydroxybenzoic acid hydrazide → 4-[5-(3-Chloro-phenylamino)-[1,3,4]oxadiazol-2-yl]-phenol

関与物質

反応手順

Mercury (II) oxide yellow (6.38 g, 29.47 mmol) was suspended in ca. 100 mL of anhydrous methanol. 4-Hydroxybenzoic acid hydrazide (4.48 g, 29.47 mmol) was added to this bright-orange suspension, followed by 3-chlorophenylisothiocyanate (5.0 g, 29.47 mmol). The reaction mixture was brought to reflux and refluxed for 2 hours. The reaction mixture turned pitch-black in color and formed black precipitate. Then it was cooled down to ambient temperature and filtered through a short pad of Celite. Then it was purified by silica gel chromatography using 0% to 20% methanol gradient in EtOAc. Solvent was removed in vacuo and the resulting grey precipitate was re-crystallized from ca. 50 mL of EtOAc. The formed white crystalline solid was filtered, washed with a small amount of EtOAc, anhydrous Et2O and dried in vacuo to give the title product as a white powder (7.606 g). Yield 89.7%.

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