Methyl iodide → 9-Bromo-8-methoxy-2,6-dimethyl-5-((2-(trimethylsilyl)ethoxy)methyl)thieno[2,3-c]quinolin-4(5H)-one

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Reaction Conditions

Reaction Steps

To a stirred solution of diidopropylamine (85 μL, 0.6 mmol) in THF (2.5 mL) at −78° C. was added n-BuLi (2.5 M, 0.24 mL, 0.60 mmol) and the reaction mixture was stirred at 0° C. for 10 min then cooled to −78° C. A solution of 9-bromo-8-methoxy-6-methyl-5-((2-(trimethylsilyl)ethoxy)methyl)thieno[2,3-c]quinolin-4(5H)-one (0.23 g, 0.50 mmol) in THF (1 mL) was added dropwise and the reaction mixture was stirred at −78° C. for 30 min. Iodomethane (93 μL, 1.5 mmol) was added and the reaction mixture was stirred at −78° C. for 2 h and quenched by the addition of satd. aq. ammonium chloride and extracted with dichloromethane. The organics were dried over Na2SO4, filtered, concentrated in vacuo and the residue was purified by column chromatography (silica, heptane/ethyl acetate) to afford the desired product (0.13 g, 55%) as a white solid: ESI MS m/z 468 [C20H26BrNO3SSi+H]+.

Provenance & Evidence