Cesium carbonate → (4S,5S)-4-(((tert-Butyldiphenylsilyl)oxy)methyl)-3-(6-chloro-2-morpholinopyrimidin-4-yl)-5-(4-methoxyphenyl)oxazolidin-2-one

関与物質

反応条件

反応手順

To a solution of (4S,5S)-4-(((tert-butyldiphenylsilyl)oxy)methyl)-5-(4-methoxyphenyl)-oxazolidin-2-one (1.65 g, 3.57 mmol), 4-(4,6-dichloropyrimidin-2-yl)morpholine (920 mg, 3.93 mmol) and Cs2CO3 (1.75 g, 5.36 mmol) in dioxane (20 mL) was added after purging with argon 4,5-bis(diphenylphosphino)-9,9-dimethylxanthene (145 mg, 250 μmol) and Pd2(dba)3 (65 mg, 0.071 mmol), and the reaction mixture was heated for 5 h at 100° C. The reaction mixture was added to 10% aqueous NaHCO3 solution and extracted with EtOAc. Combined extracts were washed with brine, dried over MgSO4, filtered and concentrated. The residue was purified by column chromatography using EtOAc in heptane from 0% to 50% in order to give the title compound as a white solid (2.33 g, 94%). TLC (heptane/EtOAc 1:1) Rf=0.52; LC-MS: [M+H] 659,661; Rt 1.58 min; (LCMS method 2). 1H NMR (400 MHz, CDCl3): 7.64 (m, 4H), 7.54 (s, 1H), 7.55-7.35 (m, 6H), 7.26 (m, 2H), 6.95 (d, 2H), 5.21 (d, 1H), 4.56 (m, 1H), 4.22 (dd, 1H), 3.96 (dd, 1H), 3.84 (s, 3H), 3.60-3.40 (m, 8H), 1.09 (s, 9H).

情報源と証拠