反应详情

To a stirred solution of 6-(trifluoromethyl)spiro[3,4-dihydro-2H-pyrrolo[1,2-a]pyrazine-1,4′-piperidine]dihydrochloride (475 mg, 1.43 mmol), 4-isopropoxy-3-methoxy-benzoic acid (361 mg, 1.72 mmol) and 1-hydroxybenzotriazole (232 mg, 1.72 mmol) in CH2Cl2 (5.5 mL) at ambient temperature was added 3-(ethyliminomethyleneamino)-N,N-dimethyl-propan-1-amine (266 mg, 1.72 mmol) followed by 4-methylmorpholine (786 μL, 7.15 mmol). The mixture was stirred for 16 h at room temperature. The mixture was poured into water and was extracted with EtOAc (3×). The organics were combined, washed with 0.1 N HCl, 1N NaOH, water, brine, dried (Na2SO4) and evaporated to dryness. The residue was purified by column chromatography (0-100% ethyl acetate/hexanes) to give (4-isopropoxy-3-methoxy-phenyl)-[6-(trifluoromethyl)spiro[3,4-dihydro-2H-pyrrolo[1,2-a]pyrazine-1,4′-piperidine]-1′-yl]methanone (623 mg, 96%). ESI-MS m/z calc. 451.2, found 452.3 (M+1)+; Retention time: 1.30 minutes (3 min run). 1H NMR (400 MHz, CDCl3) δ 7.03 (d, J=1.9 Hz, 1H), 6.98 (dd, J=8.2, 1.9 Hz, 1H), 6.88 (d, J=8.3 Hz, 1H), 6.54 (d, J=3.7 Hz, 1H), 5.93 (d, J=3.8 Hz, 1H), 4.56 (dd, J=12.2, 6.1 Hz, 1H), 4.52 (s, 1H), 3.94 (s, 2H), 3.88 (s, 3H), 3.69 (s, 1H), 3.47 (s, 2H), 3.27 (s, 2H), 1.87 (s, 4H), 1.38 (d, J=6.1 Hz, 6H).

1. extractionwas extracted with EtOAc (3×)
2. washwashed with 0.1 N HCl, 1N NaOH, water, brine
3. dry with materialdried (Na2SO4)
4. customevaporated to dryness
5. customThe residue was purified by column chromatography (0-100% ethyl acetate/hexanes)