Methanol → (S)-4-methyl-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

Participants

Reaction Steps

(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 (150 mg, 0.37 mmol) obtained in Step 1 was suspended in THF (2.0 mL), and the mixture was stirred at room temperature for 2 hours after adding methanol (0.022 mL, 0.55 mmol), triphenylphosphine (144 mg, 0.55 mmol), and diethyl azodicarboxylate (40% toluene solution, 0.25 mL, 0.55 mmol). The residue obtained by concentrating the mixture under reduced pressure was then purified by silica gel column chromatography to give (S)-4-methyl-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 (127 mg, 82%).

Provenance & Evidence