Triethylamine → 2,2'-oxybis(N-(2-(2-(2-(3-(6,8-dichloro-2-methyl-1,2,3,4-tetrahydroisoquinolin-4-yl)phenylsulfonamido)ethoxy)ethoxy)ethyl)acetamide)

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To a solution of N-(2-(2-(2-aminoethoxy)ethoxy)ethyl)-3-(6,8-dichloro-2-methyl-1,2,3,4-tetrahydroisoquinolin-4-yl)benzenesulfonamide (150 mg, 0.30 mmol) in DMF (2 mL) was added triethylamine (60 mg, 0.59 mmol) and bis(2,5-dioxopyrrolidin-1-yl) 2,2′-oxydiacetate (intermediate 178.1) (49 mg, 0.15 mmol) and the resulting solution was stirred overnight. After removal of the solvent, the crude product (150 mg) was purified by Flash-Prep-HPLC (C18 silica gel; methanol/water=0.05/100 increasing to methanol/water=90/100 within 25 min) to give 44.4 mg (27%) of the title compound as a TFA salt. 1H-NMR (300 MHz, CD3CD, ppm): 7.79˜7.76 (m, 2H), 7.70 (s, 2H), 7.57-7.50 (m, 4H), 7.36 (d, J=Hz, 2H), 4.89-4.41 (m, 2H), 4.06 (m, 4H), 3.81-3.62 (m, 5H), 3.59-3.42 (m, 11H), 3.33-3.31 (m, 8H), 3.07-3.01 (m, 6H), 2.71-2.64 (m, 2H), 2.48 (s, 6H). LCMS (ES, m/z): 1103[M+H]+.

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