Formic Acid → 2-((1-(4-Fluorophenyl)-4-oxo-8-(3-(2'-oxospiro[cyclopropane-1,3'-indoline]-1'-yl)propyl)-1,3,8-triazaspiro[4.5]decan-3-yl)methyl)benzoic acid

Participants

Reaction Steps

To tert-butyl 2-((1-(4-fluorophenyl)-4-oxo-8-(3-(2′-oxospiro[cyclopropane-1,3′-indoline]-1′-yl)propyl)-1,3,8-triazaspiro[4.5]decan-3-yl)methyl)benzoate (0.12 g, 0.19 mmol) was added concentrated formic acid (2 mL) and triethylsilane (0.05 mL). After stirring at room temperature for 18 hours, the reaction mixture was concentrated, isolated by pTLC (10% methanol/dichloromethane) and lyophilized with 4M HCl in dioxane (0.5 mL) to obtain the title compound as a hydrochloride salt (0.038 g, 33%); 1H NMR (DMSO-d6): δ 1.53 (t, 2H, J=3.6 Hz), 1.61 (t, 2H, J=3.6 Hz), 2.00 (d, 2H, J=14.4 Hz), 2.08 (t, 2H, J=8 Hz), 2.70 (t, 2H, J=13.6 Hz), 3.20 (br, 2H), 3.45-3.72 (m, 4H), 3.83 (t, 2H, J=7.2 Hz), 4.64 (s, 2H), 4.91 (s, 2H), 6.99-7.10 (m, 6H), 7.20-7.28 (m, 2H), 7.31 (d, 1H, J=7.6 Hz), 7.42 (t, 1H, J=7.6 Hz), 7.59 (t, 1H, J=6.8 Hz), 7.91 (dd, 1H, J=7.6 and 1.2 Hz), 10.26 (br, 1H), 13.18 (s, 1H); MS for C34H35FN4O4 m/z 583.3 (M+H)+.

Provenance & Evidence