Sodium Sulfide → HCID 86692645, compound

Participants

Reaction Steps

Compound (3) from the previous step was dissolved into 500 ml slightly boiling methanol, and a solution of sodium sulfide in 500 ml methanol was added drop-wise over about 1 hour at boiling temperature. The reactant was then kept at boiling temperature for about 1 hour. Methanol was removed by rotary evaporation and the sticky residue was absorbed by silica gel. The purification of product was performed by column chromatography using petroleum ether/ethyl acetate (30:1) as the eluent. Methyl 3-bromo-4,6-dihydrothieno[3,4-b]thiophene-2-carboxylate was obtained as colorless oil. The yield was about 75%.

Provenance & Evidence