Propylamine → Methyl 4-[5-(2-carboxy-1-hydroxy-3-(propylcarbamoyl)propyl]-1-propylindol-3-ylmethyl]-3-methoxybenzoate

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A solution of methyl 4-[5-(3-carboxy-2,3,4,5-tetrahydro-5-oxofuran-2-yl)-1-propylindol-3-ylmethyl]-3-methoxybenzoate (0.89 g), triethylamine (2.1 g), and propylamine (1.5 g) in methylene chloride (15 ml) was stirred and heated under reflux for 22 hr. The cooled mixture was diluted with ethyl acetate, washed (1M hydrochloric acid (twice), water (3 times), brine), dried (MgSO4), and evaporated to give methyl 4-[5-(2-carboxy-1-hydroxy-3-(propylcarbamoyl)propyl]-1-propylindol-3-ylmethyl]-3-methoxybenzoate (0.82 g, 82%, as a mixture of diastereomers) as an off-white foam: partial NMR (300 MHz, DMSO-d6): 0.80(m, 6H, 2×CH3, both isomers), 3.83(s, 3H, OCH3, both isomers), 3.92(s, 3H, OCH3, both isomers), 4.71(d, 0.5H, CHOH, isomer A), 5.05(d, 0.5H, CHOH, isomer B), 7.64(t, 0.5H, NH isomer A/B), 7.75(t, 0.5H, NH isomer B/A).

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