Boron tribromide → HCID 86689509, compound

Participants

Reaction Steps

To a solution of (R)-tert-butyl 2-(4-(2-chloro-8-methoxy-6-methyl-4-oxo-5-((2-(trimethylsilyl)ethoxy)methyl)-4,5-dihydrothieno[2,3-c]quinolin-9-yl)phenyl)propylcarbamate (32 mg, 0.050 mmol) in CH2Cl2 at 0° C. was added BBr3 (1.0 M in methylene chloride, 1.0 mL, 1.0 mmol) and the reaction was stirred at that temperature for 1 h and quenched by pouring onto water or ice-water. The resulting 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 as a hydrochloride salt: 1H NMR (500 MHz, MeOD) δ 7.57 (dd, J=7.9, 1.8 Hz, 1H), 7.48 (dd, J=7.8, 1.8 Hz, 1H), 7.35 (dd, J=7.9, 1.7 Hz, 1H), 7.29 (dd, J=7.8, 1.6 Hz, 1H), 7.10 (d, J=0.7 Hz, 1H), 5.75 (s, 1H), 3.28-3.19 (m, 3H), 2.55 (s, 3H), 1.50 (d, J=6.4 Hz, 3H). ESI MS m/z 399 [C21H19ClN2O2S+H]+.

Provenance & Evidence