Diisopropylethylamine → 1-(3,4-Dimethoxyphenyl)-4-((S)-hexahydropyrrolo[1,2-a]pyrazin-2-yl)butane-1,4-dione

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At 0° C., 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (479 mg, 2.5 mmol) was added to a solution of 3-(3,4-dimethoxybenzoyl)propionic acid (596 mg, 2.5 mmol) and 3-hydroxy-3H-dihydrobenzo[d][1,2,3]triazin-4-one (408 mg, 2.5 mmol) in a mixture of dichloromethane (10 ml) and N,N-dimethylformamide (10 ml). The reaction mixture was stirred for 25 min at 0° C. A solution of the crude dihydrochloride salt of (S)-octahydro-pyrrolo[1,2-a]pyrazine in N,N-dimethylformamide (4 ml) and ethyldiisopropylamine (3.0 ml, 17.5 mmol) were added successively. The reaction mixture was stirred for 16 hours, while it was warming up to room temperature. It was diluted with ethyl acetate (200 ml) and washed with a saturated aqueous solution of sodium hydrogen carbonate. The aqueous phase was extracted with ethyl acetate (2×100 ml). The combined organic layers were dried over magnesium sulphate. The solvent was removed in vacuo. The crude product was purified by HPLC on a C18-reversed phase column, using a mixture of 1% trifluoroacetic acid in water and acetonitrile as eluent, to give 148 mg of the title compound.

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