反应详情

A mixture of 2′-methyl-6′-(trifluoromethyl)-3′,4′-dihydro-2′H-spiro[piperidine-4,1′-pyrrolo[1,2-a]pyrazine]dihydrochloride (69 mg, 0.20 mmol), 4-isopropoxy-3-methoxybenzoic acid (42 mg, 0.20 mmol), HATU (76 mg, 0.20 mmol), Et3N (112 μL, 0.80 mmol) and DMF (2 mL) was allowed to stir at room temperature for 3 h. The mixture was filtered and purified by reverse-phase preparatory HPLC (10-99% ACN/water). The desired fractions were concentrated to give (4-isopropoxy-3-methoxyphenyl)(2′-methyl-6′-(trifluoromethyl)-3′,4′-dihydro-2′H-spiro[piperidine-4,1′-pyrrolo[1,2-a]pyrazine]-1-yl)methanone as an amorphous white solid. ESI-MS m/z calc. 465.2, found 466.3 (M+1)+; Retention time: 1.23 minutes (3 min run). 1H NMR (400 MHz, CDCl3) δ 7.01 (d, J=1.7 Hz, 1H), 6.97 (dd, J=8.2, 1.7 Hz, 1H), 6.88 (d, J=8.3 Hz, 1H), 6.53 (d, J=3.0 Hz, 1H), 5.94 (d, J=3.5 Hz, 1H), 4.57 (dt, J=12.2, 6.1 Hz, 1H), 4.52 (s, 1H), 3.99 (s, 2H), 3.87 (s, 3H), 3.69 (s, 1H), 3.40 (s, 1H), 3.34 (t, J=5.4 Hz, 3H), 2.39 (s, 3H), 2.11 (s, 2H), 1.82 (s, 2H), 1.38 (d, J=6.1 Hz, 6H).

1. filtrationThe mixture was filtered
2. custompurified by reverse-phase preparatory HPLC (10-99% ACN/water)
3. concentrationThe desired fractions were concentrated