Dichloromethane → HCID 22048404, compound

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Reaction Steps

The above 1-(3-carboxymethoxybenzoyl)-6,7-dimethoxy-isoquinoline-4-carboxylic acid ethyl ester (88.5 mg, 0.19 mmol) was suspended in 8 ml of methylene chloride containing 10 equivalent of pyrrolidine, 2.0 equivalent of HBTU and 3.0 equivalent of triethylamine. The mixture was stirred at room temperature overnight and then evaporated to remove solvents. The residue was extracted with ethyl acetate and water. The organic layer was dried and solvents were evaporated. The residue was dissolved in 4 ml of methanol and aqueous lithium hydroxide was added (0.5N, 1 ml). The mixture was stirred overnight until all starting material disappeared. The reaction was loaded to a preparative HPLC for purification to give 6,7-Dimethoxy-1-[3-(2-oxo-2-pyrrolidin-1-yl-ethoxy)-benzoyl]-isoquinoline-4-carboxylic acid as a fluffy solid (29 mg, 33%). ES-MS calcd for C25H24N2O7 (m/e) 464.5, obsd 465.4 (M+H).

Provenance & Evidence