Methyl Methanesulfonate → HCID 19940147, compound

Participants

Reaction Conditions

Reaction Steps

The lithio derivative of methyl methanesulfonate was prepared at -78° C. under argon by the dropwise addition of 0.56 mL of a 1.60M n-butyllithium (0.891 mmol) to a solution of 72 μL (0.85 mmol) of methyl methanesulfonate in 2 mL of anhydrous tetrahydrofuran. After 45 minutes at -78° C., 3-formyl-2,5-dithienylpyrrole (105 mg, 0.41 mmol) in I mL of tetrahydrofuran was added dropwise over a 5 minute period to the lithio methyl methanesulfonate solution. The reaction mixture was allowed to stir for 30 minutes at -78° C. After the completion of reaction, it was then quenched with a saturated aqueous ammonium chloride solution. The aqueous layer was extracted three times with 50 mL portions of ethyl acetate and the combined organic layers were washed with water (10 mL ×1 ) and brine (10 mL×1). The organic layer was dried over anhydrous magnesium sulfate, filtered and the solvent was removed under reduced pressure. The crude product was purified on 50 g of silica gel. Elution with hexane-ethyl acetate (5:1), gave 64 mg (43%) of title compound.

Provenance & Evidence