反应详情

Acetyl chloride (158 μL, 2.22 mmol) was added drop-wise to a mixture of (4-isopropoxy-3-methoxy-phenyl)-[6-(trifluoromethyl)spiro[3,4-dihydro-2H-pyrrolo[1,2-a]pyrazine-1,4′-piperidine]-1′-yl]methanone (100 mg, 0.222 mmol) and pyridine (1 mL) at room temperature. The mixture was allowed to stir for 16 h at room temperature before it was partitioned between ethyl acetate and 1N HCl. The layers were separated and the organic layer was washed with 1N HCl, water, and then brine. The organic layer was dried over sodium sulfate and concentrated under reduced pressure. The residue was taken up in DMF and was purified by preparatory-HPLC (10-99% ACN/water with ammonium formate modifier) to give 1-[1′-(4-isopropoxy-3-methoxy-benzoyl)-6-(trifluoromethyl)spiro[3,4-dihydropyrrolo[1,2-a]pyrazine-1,4′-piperidine]-2-yl]ethanone (60 mg, 53%) as a white solid. ESI-MS m/z calc. 493.2, found 494.7 (M+1)+; Retention time: 1.70 minutes (3 min run). 1H NMR (400 MHz, CDCl3) δ 7.06 (d, J=1.8 Hz, 1H), 7.05-6.98 (m, 1H), 6.88 (d, J=8.2 Hz, 1H), 6.55 (d, J=3.3 Hz, 1H), 6.15 (d, J=3.9 Hz, 1H), 4.57 (d, J=6.1 Hz, 1H), 4.19-4.10 (m, 2H), 3.88 (m, s, 5H), 3.79 (s, 2H), 3.70-3.52 (m, J=31.5 Hz, 2H), 3.11 (s, 2H), 2.24 (s, 3H), 1.92-1.75 (m, 2H), 1.38 (d, J=6.1 Hz, 6H).

1. customwas partitioned between ethyl acetate and 1N HCl
2. customThe layers were separated
3. washthe organic layer was washed with 1N HCl, water
4. dry with materialThe organic layer was dried over sodium sulfate
5. concentrationconcentrated under reduced pressure
6. customwas purified by preparatory-HPLC (10-99% ACN/water with ammonium formate modifier)