Methyl iodide → 2-(5,7-Difluoro-quinolin-6-yl)-propionic acid methyl ester

Participants

Reaction Steps

To a solution of LDA (1.2 M in THF, 9.5 mL, 11.4 mmol) in dry THF (30 mL) at −78° C. was added a solution of (5,7-difluoroquinolin-6-yl)-acetic acid methyl ester (2.12 g, 9.5 mmol) in THF (20 mL) dropwise. After 30 min, MeI (0.9 mL, 14.2 mmol) was added dropwise, and the reaction mixture was allowed to rise to 0° C. naturally. After 1 h, the reaction was quenched by saturated aqueous NaHCO3 solution, and extracted with EtOAc. The organic layer was washed with brine, dried over anhydrous Na2SO4, filtered, concentrated, and purified by column chromatography to afford 2.272 g (95%) of the title compound as a pale yellow solid. 1H-NMR (400 MHz, DMSO-d6) δ ppm 8.93 (d, 1H), 8.39 (dd, 1H), 7.61 (dd, 1H), 7.41-7.46 (m, 1H), 4.29 (q, 1H), 3.73 (s, 3H), 1.62 (d, 3H). LCMS (method A): [MH]+=252, tR=5.09 min. (5,7-difluoroquinolin-6-yl)-acetic acid methyl ester was synthesized using the method described in WO2008/144767 p 108 (intermediate 2), followed by the method described for Intermediate 12, step 1 WO2008/144767 p 114.

Provenance & Evidence