Triethylamine → HCID 24999337, 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 of 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. 60/777,506, 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, 4-(2-hydroxyethyl)morpholine (51 μL, 0.42 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 (37%) of the title compound (2).

Provenance & Evidence