Dichloromethane → (R)-9-(4-(1-Aminopropan-2-yl)phenyl)-8-methoxy-2,6-dimethylthieno[2,3-c]quinolin-4(5H)-one hydrochloride

Participants

Reaction Steps

To a solution of (R)-tert-butyl 2-(4-(8-methoxy-2,6-dimethyl-4-oxo-5-((2-(trimethylsilyl)ethoxy)methyl)-4,5-dihydrothieno[2,3-c]quinolin-9-yl)phenyl)propylcarbamate (24 mg, 0.039 mmol) in CH2Cl2 (1 mL) at rt was added trifluoroacetic acid (1.0 mL) and the reaction was stirred at that temperature for 2 h. The mixture was concentrated and the residue was dissolved methanol (2 mL) and treated with NH4OH (2 mL). The resulting mixture was stirred at rt for 2 h and purified by preparatory HPLC (C18 silica, acetonitrile/water (with 0.05% TFA) gradient). The desired fractions were combined, concentrated and the residue was dissolved in aqueous HCl, concentrated and dried under high vacuum to afford the desired product (5 mg, 30%) as a hydrochloride salt: 1H NMR (500 MHz, CD3OD) δ 7.52 (dd, J=7.8, 1.5 Hz, 1H), 7.47 (dd, J=7.7, 1.5 Hz, 1H), 7.32 (s, 1H), 7.31-7.22 (m, 2H), 5.30 (d, J=2.7 Hz, 1.1H), 3.29-3.18 (m, 3H), 2.63 (s, 3H), 1.47 (d, J=6.1 Hz, 3H): ESI MS m/z 392 [C23H24N2O4S+H]+.

Provenance & Evidence