Triethylamine → HCID 68153610, compound

Participants

Reaction Steps

To tert-butyl 6-(trifluoromethyl)spiro[3,4-dihydro-2H-pyrrolo[1,2-a]pyrazine-1,4′-piperidine]-1′-carboxylate (600 mg, 1.67 mmol), THF (3 mL) and Et3N (698 μL, 5.01 mmol) was added methyl isocyanate (199 μL, 3.34 mmol). The mixture was allowed to stir at room temperature for 2 h. The mixture was charged with additional Et3N (698 μL, 5.01 mmol) and methyl isocyanate (199 μL, 3.34 mmol), and the reaction was stirred at room temperature for 3 d. The solvent was evaporated under reduced pressure. The residue was dissolved in ethyl acetate (40 mL) and washed with water (3×10 mL). The organic layer was dried over sodium sulfate, filtered, and concentrated in vacuo to yield tert-butyl 2-(methylcarbamoyl)-6-(trifluoromethyl)spiro[3,4-dihydropyrrolo[1,2-a]pyrazine-1,4′-piperidine]-1′-carboxylate (680 mg, 97%). ESI-MS m/z calc. 416.2, found 417.4 (M+1)+; Retention time: 1.73 minutes (3 min run). 1H NMR (400 MHz, DMSO) δ 7.14 (q, J=4.3 Hz, 1H), 6.56 (d, J=3.4 Hz, 1H), 6.03 (d, J=3.9 Hz, 1H), 3.88 (t, J=5.4 Hz, 2H), 3.73 (t, J=5.4 Hz, 2H), 3.69-3.55 (m, 2H), 3.23-3.03 (m, 2H), 2.78-2.62 (m, 2H), 2.56 (d, J=4.4 Hz, 3H), 1.76-1.60 (m, 2H), 1.40 (s, 9H).

Provenance & Evidence