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The above ester (0.85 g, 0.0022 mol) was dissolved in ethanol (6 ml) and 0.5N NaOH was added. By continued addition of 0.25N NaOH pH was kept at approximately 12 for 3 days. Dilute HCl (approx. 1N) was added until pH=7, and the solvent was evaporated in vacuo. The residue was purified by column chromatography on silica gel (50 g) using a mixture of dichloromethane, methanol and acetic acid (20:2:1) as eluent. The product fractions were stripped with dichloromethane, affording 0.04 g (3.8%) of 1-(3-(10,11-dihydro-5H-dibenzo[b,f]azepin-5-yl)-1-propyl)-3-pyrrolidinacetic acid as an amorphous product.

1. customthe solvent was evaporated in vacuo
2. customThe residue was purified by column chromatography on silica gel (50 g)
3. additiona mixture of dichloromethane, methanol and acetic acid (20:2:1) as eluent