Tert-butyl 3-((1-(4-fluorophenyl)-4-oxo-8-(4-oxo-4-phenylbutyl)-1,3,8-triazaspiro[4.5]decan-3-yl)methyl)benzoate → 3-((1-(4-Fluorophenyl)-4-oxo-8-(4-oxo-4-phenylbutyl)-1,3,8-triazaspiro[4.5]decan-3-yl)methyl)benzoic acid

Participants

Reaction Steps

A solution of tert-butyl 3-((1-(4-fluorophenyl)-4-oxo-8-(4-oxo-4-phenylbutyl)-1,3,8-triazaspiro[4.5]decan-3-yl)methyl)benzoate (100 mg, 0.171 mmol, 1 equiv) in 4M hydrogen chloride solution in dioxane was stirred at ambient temperature for 5 h. The mixture was concentrated in vacuo and purified using preparative thin layer chromatography in 10% methanol in dichloromethane to afford the title compound as white powder (25 mg, 23%); 1H NMR (400 MHz, DMSO-d6): δ 1.62 (d, 2H, J=14 Hz); 1.83 (t, 2H, J=6.8 and 7.2 Hz); 2.19-2.28 (m, 2H); 2.44 (t, 2H, J=6.8 Hz); 2.78 (bs, 4H); 3.03 (t, 2H, J=7.2 and 6.8 Hz); 4.54 (s, 2H); 4.59 (s, 2H); 6.81-6.85 (m, 2H); 6.99 (t, 2H, J=8.8 and 9.6 Hz); 7.49-7.53 (m, 4H); 7.62 (t, 1H, J=7.6 Hz); 7.86 (bs, 2H); 7.95-7.97 (m, 2H); 13.1 (bs, 1H); MS for C31H32FN3O4 m/z 530.4 (M+H)+.

Provenance & Evidence