Methanol → HCID 57934778, compound

Participants

Reaction Conditions

Reaction Steps

To a vial containing methyl 5-tert-butyl-2-aminothiophene-3-carboxylate (0.643 g) in 1:1 methanol: H2O (6 mL) was added KOH (0.5069 g). The vial was capped and the mixture was stirred at 80° C. for 6 h. The solvent was removed under vacuum and the crude product was dissolved in water (50 mL) and transferred to a 100 mL round bottom flask. To the vigorously stirred aqueous solution was added at room temperature drop wise phosgene (2M toluene, 6 mL) over a 15 minute period. The resulting mixture was stirred at room temperature overnight. The crude reaction mixture was filtered; the precipitate was washed with water, dried and dissolved in ethyl acetate (10 mL). The organic solution was dried over anhydrous sodium sulfate, filtered and the solvent was removed under vacuum to give 654.9 mg (96%) of the expected 6-tert-butyl-1H-thieno[2,3-d][1,3]oxazine-2,4-dione.

Provenance & Evidence