Sodium Carbonate → (4S,5R)-tert-butyl 5-(4-(6-(1,1-dioxido-2H-thiet-3-yl)pyridin-3-yl)phenyl)-4-(fluoromethyl)-2,2-dimethyloxazolidine-3-carboxylate

Participants

Reaction Conditions

Reaction Steps

The solution of the product of step 3, Example 18 (0.15 g, 0.538 mmol, 1 eq), (4S,5R)-4-Fluoromethyl-2,2-dimethyl-5-[4-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)-phenyl]-oxazolidine-3-carboxylic acid tert-butyl ester (previously described in US2004082553, Example 20, intermediate 19, 0.234 g, 0.538 mmol, 1 eq) and sodium carbonate (0.171 g, 1.613 mmol, 3 eq) in mixture of Toluene/Ethanol/Water (1:1:0.5, 2.5 mL) is degassed with nitrogen for 30 minutes in sealed tube. To the resulting reaction mixture tetrakis(triphenylphosphine)palladium(0) (0.062 g, 0.054 mmol, 0.1 eq) is added. Resulting reaction mixture is heated at 80° C. for 6 hours. The reaction mixture is quenched with water (15 mL) and extracted with ethyl acetate (3×25 mL). Combined organic layer is dried over sodium sulphate and concentrated in vacuo. The crude compound is purified by column chromatography using (100-200 mesh silica). Desired compound is eluted with 30% ethyl acetate in hexane to afford title compound as yellow solid (0.16 g): 1H-NMR (400 MHz, DMSO) δ: 1.43 (bs, 9H), 1.51 (s, 3H), 1.64 (s, 3H), 3.85-3.90 (m, 1H), 4.47-4.59 (m, 1H), 4.75-4.84 (m, 1H), 5.05 (s, 2H), 5.15 (d, 1H, J=7.16 Hz), 7.62 (d, 2H, J=8.12 Hz), 7.76 (s, 1H), 7.87 (d, 2H, J=8.2 Hz), 7.93 (d, 1H, J=8.12 Hz), 8.31-8.34 (dd, 1H, J1=8.24 Hz, J2=2.16 Hz). 9.07 (d, 1H, J=1.88 Hz). LC-MS (m/z): [M+H] 489.1.

Provenance & Evidence