(2R)-1-(1H-Indol-3-YL)propan-2-amine → HCID 117719364, Verbindung

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

(E)-Methyl 3-(4-formylphenyl)acrylate (obtained as described in Example 2, preparation of starting materials) (18.56 g, 97.57 mmol) was added to a stirred solution of (R)-1-(1H-indol-3-yl)propan-2-amine (17 g, 97.57 mmol) in acetic acid (250 mil) at 23° under nitrogen. The resulting solution was stirred at 80° C. for 2 hours. The reaction mixture was evaporated to dryness and redissolved in DCM (500 ml), and washed sequentially with saturated NaHCO3 (300 ml×2), 2M NaOH (aq) (300 ml), water (300 ml), and saturated brine (300 ml). The organic layer was dried over MgSO4, filtered and evaporated to afford crude product. The crude product was purified by flash silica chromatography, elution gradient 1 to 7% methanol in DCM. Pure fractions were evaporated to dryness to afford (E)-methyl 3-(4-((1S,3R)-3-methyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-1-yl)phenyl)acrylate (25.1 g, 74.3%) as a beige foam. The product was mostly cis isomer, containing about 12% trans isomer which was inseparable. 1H NMR (400 MHz, DMSO, 30° C.) δ 1.25 (3H, d), 2.37-2.48 (1H, m), 2.74 (1H, d), 3.12 (1H, s), 3.73 (3H, s), 5.18 (1H, s), 6.64 (1H, d), 6.97 (2H, dd), 7.19 (1H, d), 7.36-7.46 (3H, m), 7.64-7.75 (3H, m), 10.19 (1H, s), no NH observed. m/z: ES+ [M+H]+ 347.

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