Ethylene Glycol → HCID 24871524, compound

Participants

Reaction Steps

Triethylamine (17.5 μL, 0.13 mmol) and ethyl chloroformate (6 μL, 0.063 mmol) were added sequentially to a solution 5-(3-{(S)-1-[4-(1-hydroxyhexyl)-phenyl]-5-oxo-pyrrolidin-2-yl}-propyl)-thiophene-2-carboxylic acid (derived from the faster eluting [HPLC] ester diastereomer, see U.S. Ser. No. 10/599,046 or U.S. Provisional Patent Application No. 60/777,506, filed on Feb. 28, 2006, incorporated by reference herein, 18 mg, 0.042 mmol) in CH2Cl2 (0.6 mL) at 0° C. The mixture was allowed to warm to room temperature. After 30 min at room temperature, ethylene glycol (25 μL, 0.45 mmol) was added. After stirring overnight at room temperature, the reaction mixture was concentrated under a stream of nitrogen. The residue was diluted with EtOAc (20 mL) and washed with H2O (2×5 mL) and brine (5 mL). The organic phase was dried (Na2SO4), filtered and concentrated in vacuo. Purification of the residue by flash column chromatography on silica gel (CH2Cl2→10% MeOH/CH2Cl2, gradient) afforded 8.5 mg (43%) of the title compound (1).

Provenance & Evidence