4-Methylmorpholine → {[2-{2-(S)-[(1-Amino-isoquinolin-6-ylmethyl)-carbamoyl]-pyrrolidin-1-yl}-1-(R)-(4-methoxybenzyl)-2-oxo-ethyl]-tert.-butoxycarbonyl-amino}-acetic acid ethyl ester

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A mixture of {[2-{2-(S)-Carboxy-pyrrolidin-1-yl}-1-(R)-(4-methoxybenzyl)-2-oxo-ethyl]-tert.-butoxycarbonyl-amino}-acetic acid ethyl ester (0.240 g), 6-aminomethyl-isoquinolin-1-ylamine (0.092 g), N-methyl morpholine (0.170 mL) and 0.160 g of 2-(1H-benzotriazole-1-yl)-1,1,3,3-tetramethyluronium tetrafluoroborate (TBTU) in 8 mL of dry N,N-dimethyl formamide was stirred for 3 h at ambient temperature. Removal of the solvent in vacuo followed by purification of the remaining residue by silica chromatography (dichloromethane/methanol 80/20) gave 0.310 g (100%) of the title compound as a light yellow solid. (+)-APCI-MS: 634 (MH+).

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