Boron tribromide → 9-(4-(2-aminoethyl)-3-chlorophenyl)-6-chloro-8-hydroxythieno[2,3-c]quinolin-4(5H)-one Hydrochloride

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Reaction Steps

Following General Procedure F, tert-butyl 2-chloro-4-(6-chloro-8-methoxy-4-oxo-4,5-dihydrothieno[2,3-c]quinolin-9-yl)phenethylcarbamate (80 mg, 0.154 mmol) was reacted with tribromoborane (1.0 M in methylene chloride, 0.92 mL, 0.92 mmol) to afford the desired product (37 mg, 59%) as a white solid: 1H NMR (500 MHz, MeOD) δ 7.68 (d, J=5.4 Hz, 1H), 7.56 (d, J=7.8 Hz, 1H), 7.42 (d, J=1.7 Hz, 1H), 7.30 (s, 1H), 7.27 (dd, J=7.8, 1.7 Hz, 1H), 6.17 (d, J=5.4 Hz, 1H), 3.39-3.25 (m, 4H); ESI MS m/z 405 [C19H14Cl2N2O2S+H]+; HPLC 98.1% (AUC), tR=9.17 min.

Provenance & Evidence