Trifluoroacetic acid → 3-(6-(5-cyclopentylbenzofuran-2-yl)-3,4-dihydroisoquinolin-2(1H)-yl)propanoic acid

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Reaction Steps

To a stirring solution of tert-butyl 3-(6-(5-cyclopentylbenzofuran-2-yl)-3,4-dihydroisoquinolin-2(1H)-yl)propanoate (25 mg, 0.056 mmole) in CH2Cl2 (0.5 ml) was added TFA (0.5 ml). The mixture was stirred at room temperature for 3 hours. Under reduced pressure, solvents and excess of TFA were removed affording a yellow oil which was rinsed with a mixture of CH2Cl2/Hexane (1:4) followed by ether. The solvents were removed under vacuum to give the title compound (19 mg, 90%). 1H NMR (400 MHz, CD3OD) δ 7.82 (m, 2H), 7.47 (s, 1H), 7.40 (d, 1H), 7.30 (d, 1H), 7.20 (d, 1H), 7.19 (s, 1H), 4.54 (br, 2H), 3.69 (br, 2H), 3.60 (dd, 2H), 3.28 (m, 2H), 3.10 (m, 1H), 2.96(dd, 2H), 2.10 (m, 2H), 1.85 (m, 2H), 1.74 (m, 2H), 1.65 (m, 2H). MS (ESI) m/z: Calculated: 389.2; Observed: 390.20 (M++1).

Provenance & Evidence