Ammonia → HCID 178484948, compound

Participants

Reaction Conditions

Reaction Steps

To a solution of 4-{4-[7-(4-Cyano-3-trifluoromethylphenyl)-8-oxo-6-thioxo-5,7-diaza-spiro[3.4]oct-5-yl]-phenyl}-N-methyl-butyramide (88) [ND-6] (4.0 mg, 0.008 mmol) and pyridine (1.94 μL, 0.02 mmol) in dichloromethane (3 mL) at −40° C. was slowly added triflic anhydride (Tf2O, 1.75 μL, 0.01 mmol). The mixture was allowed to warm to 0° C. over 3 h. The solution was then cooled to −40° C. and ammonia was introduced by bubbling. The reaction was then warmed to room temperature and stirred overnight. Without aqueous work up, flash chromatography using 10% methanol in ethyl acetate afforded 4-(4-(7-(4-Cyano-3-(trifluoromethyl)phenyl)-8-oxo-6-thioxo-5,7-diazaspiro[3.4]oct-an-5-yl)phenyl)-N-methylbutanimidamide (87) [ND-3] (2.9 mg, 72%) of as a colorless oil: 1H NMR (CD3CN) δ 8.10 (d, 1H, J=8.2 Hz) 8.04 (s, 1H), 7.92 (d, 1H, J=8.2 Hz) 7.49 (br s, 2H), 7.43 (d, 2H, J=8.3 Hz), 7.30 (d, 2H, J=8.3 Hz) 3.26 (d, 3H, J=5.4 Hz) 2.77 (t, 2H, J=8.0 Hz) 2.56-2.65 (m, 2H), 2.52 (t, 2H, J=7.7 Hz) 2.42-2.52 (m, 2H), 1.95-2.12 (m, 3H), 1.47-1.62 (m, 1H).

Provenance & Evidence