Triphenylphosphine → N-(2-(2-(2-(2-aminoethoxy)ethoxy)ethoxy)ethyl)-3-(6,8-dichloro-2-methyl-1,2,3,4-tetrahydroisoquinolin-4-yl)benzenesulfonamide

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To N-(2-(2-(2-(2-azidoethoxy)ethoxy)ethoxy)ethyl)-3-(6,8-dichloro-2-methyl-1,2,3,4-tetrahydroisoquinolin-4-yl)benzenesulfonamide (1.8 g, 3.26 mmol, 1.00 equiv) in THF (30 mL) was added triphenylphosphine (2.6 g, 9.91 mmol, 3.04 equiv). The resulting solution was stirred overnight at room temperature and then concentrated under vacuum. The crude product (5.0 g) was purified by Flash-Prep-HPLC with the following conditions: Column, silica gel; mobile phase, methanol:water=1:9 increasing to methanol:water=9:1 within 30 min; Detector, UV 254 nm. 1.2 g product was obtained. This resulted in 1.2 g (64%) of N-(2-(2-(2-(2-aminoethoxy)ethoxy)ethoxy)ethyl)-3-(6,8-dichloro-2-methyl-1,2,3,4-tetrahydroisoquinolin-4-yl)benzenesulfonamide as yellow oil.

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