Boron tribromide → HCID 86689539, compound

Participants

Reaction Steps

Following General Procedure F, tert-butyl 2-(2-chloro-4-(8-methoxy-4-oxo-4,5-dihydrothieno[2,3-c]quinolin-9-yl)phenyl)propylcarbamate (120 mg, 0.24 mmol) in CH2Cl2 at 0° C. was added BBr3 (1.0 M in CH2Cl2, 15 mL, 15 mmol) and the reaction was warmed to room temperature for 4 h. The reaction was quenched by pouring onto water or ice-water and the resulting mixture was concentrated and purified by preparatory HPLC (C18 silica, acetonitrile/water (with 0.05% TFA) gradient). The desired product was dissolved in aqueous HCl, concentrated and dried under high vacuum to afford the desired product as a brown solid (40 mg, 43%): 1H NMR (500 MHz, CD3OD) δ 7.65 (ddd, J=9.9, 9.3, 6.1 Hz, 2H), 7.46-7.36 (m, 2H), 7.33-7.27 (m, 1H), 7.18 (t, J=9.0 Hz, 1H), 6.10 (dd, J=28.8, 5.4 Hz, 1H), 3.86-3.66 (m, 1H), 3.29-3.12 (m, 2H), 1.44-1.28 (m, 3H); ESI MS m/z 385 [C20H17ClN2O2S+H]+; HPLC >99% (AUC), tR=9.07 min.

Provenance & Evidence