반응 단계
(S)-3-(4′-Cyano-biphenyl-4-yl)-2-{[(3S,7S)-3-(4-hydroxy-phenyl)-1-methyl-2-oxo-6-((R)-1-phenyl-propyl)-2,3,5,6,7,8-hexahydro-1H-4-oxa-1,6-diaza-anthracene-7-carbonyl]-amino}-propionic acid methyl ester (0.177 mmol) was dissolved in 2 mL of DMF and 3,4-dichlorobenzyl bromide (0.885 mmol) and potassium carbonate (0.885 mmol) were added. The mixture was stirred at room temperature for 6 hours and was poured onto ethyl acetate and saturated sodium bicarbonate. The organic layer was dried over sodium sulfate and concentrated. The residue was purified over silica (hexanes-ethyl acetate-MeOH, 7-3-0.1) to provide (S)-3-(4′-Cyano-biphenyl-4-yl)-2-{[(3S,7S)-3-[4-(3,4-dichloro-benzyloxy)-phenyl]-1-methyl-2-oxo-6-((R)-1-phenyl-propyl)-2,3,5,6,7,8-hexahydro-1H-4-oxa-1,6-diaza-anthracene-7-carbonyl]-amino}-propionic acid methyl ester. 1H NMR (400 MHz, d6 acetone): 7.77-7.86 (m, 5H), 7.60 (d, 1H), 7.54 (m, 3H), 7.37 (dd, 1H), 7.32-7.18 (m, 7H), 6.97 (d, 1H), 6.92 (s, 1H), 6.82 (m, 3H), 6.78 (m, 2H), 6.71 (s, 1H), 5.65 (s, 1H), 4.95 (m, 2H), 4.66 (m, 1H), 3.76 (m, 2H), 3.70 (s, 3H), 3.58 (m, 2H), 3.40 (s, 3H), 3.06 (m, 2H), 3.02 (m, 2H), 2.83-2.72 (m, 2H), 1.96-1.7 (m, 2H), 0.54 (t, 3H).
