Sulfuric Acid → HCID 66585041, compound

Participants

Reaction Conditions

Reaction Steps

To a suspension of 2.41 g (5.16 mmol) of 2-tert-butyl 8-ethyl 6-bromo-7-(3-fluorophenyl)-3,4-dihydropyrrolo[1,2-a]pyrazine-2,8(1H)-dicarboxylate in 18 ml of ethanol are added 10.3 ml (10.3 mmol) of 1N sodium hydroxide solution and the mixture is heated at 70° C. for 2 days. The mixture is then taken up in dichloromethane and acidified by addition of 25 ml of aqueous 1N sulfuric acid. The organic phase is separated out and dried over sodium sulfate, and the solvent is evaporated off under reduced pressure, to give a yellow solid, which is purified by chromatography on a column of 40 g of silica gel, eluting with a mixture of 4% methanol in dichloromethane, to give 1.65 g of 2-(tert-butyloxycarbonyl)-6-bromo-7-(3-fluorophenyl)-1,2,3,4-tetrahydropyrrolo[1,2-a]pyrazine-8-carboxylic acid in the form of a pale yellow powder.

Provenance & Evidence