Hydrochloric Acid → methyl (2S)-5-acetyl-2-ethyl-2,3-dihydro-benzofuran-2-carboxylate

Participants

Reaction Conditions

Reaction Steps

The product from Step 4 (3.1 g, 15 mmol) was mixed with acetyl chloride (3.5 g, 45 mmol) and aluminum chloride (6.0 g, 45 mmol) in dichloromethane (100 mL). The reaction mixture was stirred at 25° C. for 1 hr and then poured into 1 N aqueous HCl (100 mL). The organic layer was separated and the aqueous phase was extracted with dichloromethane (50 mL). The combined extracts were washed with brine and concentrated to give the title compound, which was used directly for the next step.

Provenance & Evidence