1,1'-Carbonyldiimidazole → HCID 67350115, compound

Participants

Reaction Steps

(S)-3-(9-Methylthio-6-oxo-2,3,3a,4-tetrahydro-1H,6H-5,8,10,10b-tetraazabenzo[e]azulen-5-yl)benzoic hydrazide (1.0 g, 2.60 mmol) obtained in Step 2 of Example 56 was dissolved in THF (12 mL), and the mixture was stirred at room temperature for 2 hours after adding 1,1′-carbonyldiimidazole (464 mg, 2.86 mmol). After concentrating the mixture under reduced pressure, water was added to the resulting residue, and the pH was adjusted to 4 by addition of a 6 mol/L aqueous hydrochloric acid solution. The precipitated white solid was then filtered off to give (S)-5-[3-(9-methylthio-6-oxo-2,3,3a,4-tetrahydro-1H,6H-5,8,10,10b-tetraazabenzo[e]azulen-5-yl)phenyl]-1,3,4-oxadiazol-2(3H)-one (1.07 g, quantitative).

Provenance & Evidence