Reaction Steps
To a solution of 4-(7-phenyl-heptanoylamino)-5-[1-(3-phenyl-propyl)-1H-indol-3-yl]-pentanoic acid methyl ester (95 mg, 0.172 mmol) in MeOH (0.5 mL) was added KOH (100 mg, 1.79 mmol) in water (0.5 mL). THF (1 mL) was added to homogenise the solution and the reaction was complete in 40 minutes. The solvents were removed and water added. Upon washing with ether the aqueous layer was acidified with aqueous HCl and the resultant precipitate filtered. Upon drying the solid was recrystallised from THF/Et2O to afford the title compound (70 mg, 76%), mp 100-101.5° C. 1H NMR (DMSO-d6) δ 7.64-7.59 (2H, m), 7.35-7.08 (12H, m), 7.03-6.98 (1H, m), 4.10 (2H, t, J=6.59 Hz), 4.04 (1H, br s), 2.84 (1H, dd, J=6.65, 14.39 Hz), 2.78 (1H, dd, J=6.45, 14.39 Hz), 2.55-2.49 (4H, m), 2.34-2.12 (2H, m), 2.05-2.00 (4H, m), 1.86-1.75 (1H, m), 1.66-1.44 (5H, m), 1.21 (4H, m), 13C NMR (DMSO-d6) □ 174.4, 171.9, 142.3, 141.3, 135.9, 128.3, 128.2, 128.0, 126.5, 125.8, 125.5, 120.9, 118.9, 118.3, 117.9, 110.9, 109.5, 35.6, 35.1, 32.4, 31.5, 30.9, 30.7, 30.5, 29.2, 28.5, 28. 5, 25.3. ISMS: 539 (M+H).
