Triethylamine → N1,N4-bis(2-(2-(3-(6,8-dichloro-2-methyl-1,2,3,4-tetrahydroisoquinolin-4-yl)phenylsulfonamido)ethoxy)ethyl)-2,3-dihydroxysuccinamide

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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-(2-aminoethoxy)ethyl)-3-(6,8-dichloro-2-methyl-1,2,3,4-tetrahydroisoquinolin-4-yl)benzenesulfonamide (intermediate 176.1) (60 mg, 0.13 mmol, 1.00 equiv) in DMF (3 mL), bis(2,5-dioxopyrrolidin-1-yl) 2,3-dihydroxybutanedioate (intermediate 168.1) (21 mg, 0.06 mmol, 0.47 equiv) and triethylamine (50 mg, 0.49 mmol, 3.77 equiv). The resulting solution was stirred overnight at room temperature at which time the mixture was concentrated under vacuum. The crude product was purified by Prep-HPLC with acetonitrile:water (0.05% CF3COOH) (10%-100%). This resulted in 21 mg (13%) of a TFA salt of N1,N4-bis(2-(2-(3-(6,8-dichloro-2-methyl-1,2,3,4-tetrahydroisoquinolin-4-yl)phenylsulfonamido)ethoxy)ethyl)-2,3-dihydroxysuccinamide as a white solid. 1H-NMR (300 MHz, CD3OD, ppm): δ 7.92 (d, J=7.8 Hz, 2H), 7.81 (m, 2H), 7.67 (t, J=7.8 Hz, 2H), 7.57 (m, 2H), 7.55 (d, J=6.9 Hz, 2H), 6.85 (m, 2H), 4.78 (s, 2H), 4.77 (s, 2H), 4.54 (d, J=40.2 Hz, 2H), 4.48 (s, 2H), 3.92 (m, 2H), 3.53 (m, 10H), 3.18 (s, 6H), 3.07 (t, J=5.4 Hz, 4H). MS (m/z): 517 [½M+1]+.

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