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Into a 50-mL round-bottom flask purged and maintained with an inert atmosphere of nitrogen, was placed a solution of N-(2-aminoethyl)-3-(6,8-dichloro-2-methyl-1,2,3,4-tetrahydroisoquinolin-4-yl)benzenesulfonamide (250 mg, 0.60 mmol, 1.00 equiv) in DMF (5 mL), bis(2,5-dioxopyrrolidin-1-yl) 2,3-dihydroxysuccinate (Intermediate 168.1) (92 mg, 0.27 mmol, 0.44 equiv) and triethylamine (280 mg, 2.77 mmol, 4.55 equiv) and the resulting solution was stirred overnight at room temperature. The resulting mixture was concentrated under vacuum, the residue diluted with 100 mL of ethyl acetate and then washed with 2×10 mL of water. The organic layer was dried over anhydrous sodium sulfate and concentrated under vacuum. The crude product was purified by Prep-HPLC with the following conditions: Column, SunFire Prep C18, 5 um, 19*150 mm; mobile phase, Water with 0.05% TFA and CH3CN (25% CH3CN up to 35% in 5 min, up to 100% in 2.5 min); Detector, uv 220&254 nm. This resulted in 88.4 mg (15%) of a TFA salt of N1,N4-bis(2-(3-(6,8-dichloro-2-methyl-1,2,3,4-tetrahydroisoquinolin-4-yl)phenylsulfonamido)ethyl)-2,3-dihydroxysuccinamide as a white solid. 1H-NMR (400 MHz, CD3OD, ppm) δ 7.67 (d, J=7.6 Hz, 2H), 7.61 (s, 2H), 7.44 (t, J=7.6 Hz, 2H), 7.37 (d, J=7.6 Hz, 2H), 7.25 (d, J=2 Hz, 2H), 6.72 (s, 2H), 4.33 (t, J=6.4 Hz, 2H), 4.30 (s, 2H), 3.64 (m, 4H), 3.21 (s, 4H), 2.98 (m, 2H), 2.90 (m, 4H), 2.65 (m, 2H), 2.42 (s, 6H). MS (m/z): 943 [M+H]+.
