反应详情

温度

90 °C

(S)—N′-hydroxy-3-(9-methylthio-6-oxo-2,3,3a,4-tetrahydro-1H,6H-5,8,10,10b-tetraazabenzo[e]azulen-5-yl)benzamidine (200 mg, 0.52 mmol) obtained in Step 1 of Example 75 was dissolved in pyridine (3.0 mL), and the mixture was stirred at 90° C. for 4 hours after adding chloromethyl formate (0.12 mL, 1.56 mmol) under ice-cooled conditions. The mixture was diluted with chloroform, washed with water and saturated brine, and the organic layer was dried over anhydrous magnesium sulfate. The residue obtained by concentrating the mixture under reduced pressure was then purified by silica gel column chromatography to give (S)-3-[3-(9-methylthio-6-oxo-2,3,3a,4-tetrahydro-1H,6H-5,8,10,10b-tetraazabenzo[e]azulen-5-yl)phenyl]-1,2,4-oxadiazol-5(4H)-one (236 mg, quantitative).

1. temperaturecooled conditions
2. washwashed with water and saturated brine
3. dry with materialthe organic layer was dried over anhydrous magnesium sulfate
4. customThe residue obtained
5. concentrationby concentrating the mixture under reduced pressure
6. customwas then purified by silica gel column chromatography