Triethylamine → Methyl 4-((4S,5R)-3-(2,2-dichloroacetyl)-4-(fluoro-methyl)-2,2-dimethyloxazolidin-5-yl)benzoate

関与物質

反応条件

反応手順

To a flask containing 2,2-dichloro-1-((4S,5R)-4-(fluoromethyl)-5-(4-iodophenyl)-2,2-dimethyloxazolidin-3-yl)ethanone (2.0 g, 4.48 mmol) is added triethylamine (5 mL) and methanol (5 mL). Carbon monoxide gas is bubbled through the solution while stirring for 30 min. Pd(OAc)2 (51 mg, 0.22 mmol) and Xantphos (132 mg, 0.22 mmol) are next added and a balloon containing carbon monoxide is secured to the flask outlet. The reaction is heated for 2 hours at 60° C. and then cooled to room temperature. Next, the reaction is diluted with water, extracted with ethylacetate, dried over Na2SO4, and concentrated under vacuum. The residue is chromatographed on silica gel eluting from 100% hexanes to 50:50 ethylacetate:hexanes to afford the title compound (1.11 g): 1H NMR (400 MHz, CDCl3) 8.10 (d, 2H, J=8.0 Hz), 7.55 (d, 2H, J=8.0 Hz), 6.34 (m, 1H), 5.30-4.42 (m, 4H), 3.95 (s, 3H), 1.97-1.53 (m, 6H). m/z (CI) 320 [M-(CH3)2CO].

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