Diethyl p-aminobenzylphosphonate → 4-(3-(6,8-Dichloro-2-methyl-1,2,3,4-tetrahydroisoquinolin-4-yl)phenylsulfonamido)benzylphosphonic acid

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Compound 3 was prepared in an analogous manner to that of Compound 1 using diethyl 4-aminobenzylphosphonate (Intermediate 3.2) as the amine. 1H-NMR (300 MHz, CD3OD, ppm): 7.89 (d, J=7.8 Hz, 1H), 7.61˜7.66 (m, 1H), 7.52˜7.54 (m, 2H), 7.21˜7.20 (m, 2H), 7.11 (s, 1H), 6.95 (d, J=8.1 Hz, 2H), 6.73 (s, 1H), 4.51˜4.59 (m, 3H), 3.33 (s, 1H), 3.03˜2.89 (m, 6H). MS (ES, m/z): 541 [M+H]+.

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