反应详情

An 18-mL vial was charged with methyl 2-[4-[[2-(3-chlorophenyl)-6,7-dihydro-5H-cyclopenta[b]pyridin-4-yl]amino]phenyl]acetate (20.7 mg, 0.053 mmol) and THF (2 ml). To the mixture was added LiAlH4 (20 mg, 0.53 mmol, 10 eq.) portion-wise at 0° C. After the addition was complete, the resulting mixture was stirred under Ar at rt overnight. 2N HCl aq. (2 ml) was added followed by saturated NaHCO3 aq. The mixture was extracted with ethyl acetate (3×5 ml). The organic layer was combined and concentrated on a rotary evaporator. The residue was purified by chromatography on silica gel using dichloromethane followed by ethyl acetate as eluent to afford the desired product (15 mg), of which 1H NMR indicates it contains impurities. The product thus obtained was re-purified by chromatography on silica gel using DCM followed by DCM/EA with a ratio of 9:1 to 2:1 in favor of DCM as eluent to give 2-[4-[[2-(3-chlorophenyl)-6,7-dihydro-5H-cyclopenta[b]pyridin-4-yl]amino]phenyl]ethanol (3.5 mg, 18% yield). MW=264.87. 1H NMR (CDCl3, 360 MHz) δ 7.84 (m, 2H), 7.41 (m, 3H), 7.21 (m, 3H), 7.16 (s, 1H), 5.95 (brs, 1H), 3.90 (m, 2H), 3.18 (m, 2H), 2.87 (m, 4H), 2.24 (m, 2H).

1. additionAfter the addition
2. extractionwas extracted with ethyl acetate (3×5 ml)
3. concentrationconcentrated on a rotary evaporator
4. customThe residue was purified by chromatography on silica gel