Sodium Sulfite → Ethyl 5-bromo-3-[(1,1-dioxidotetrahydro-3-thienyl)methyl]-1H-indole-7-carboxylate

Participants

Reaction Steps

To a solution of ethyl 5-bromo-3-(tetrahydro-3-thienylmethyl)-1H-indole-7-carboxylate (7.61 g, 20.73 mmol) in dichloromethane (150 mL) was added portionwise 3-chlorobenzoperoxoic acid (10.69 g, 62.19 mmol) at room temperature. The resulting solution was stirred for 5 h. Sodium sulfite was added, and the mixture was washed with water, extracted with DCM (3×100 mL), dried (Na2SO4) and concentrated under reduced pressure. The crude product was purified by column on sillal gel (petroleum: ethyl acetate=10:1 to 5:1 to 2:1), giving 3.52 g (42.56%) of the title compound.

Provenance & Evidence