Methyl iodide → Methyl 2-(2-((trimethylsilyl)ethynyl)phenyl)propanoate

関与物質

反応手順

2 M LDA solution (1.24 mL, 2.48 mmol) was added to solution of methyl 2-(2-((trimethylsilyl)ethynyl)phenyl)acetate (I10) (0.306 g, 1.24 mmol) in THF (10 mL) at −78° C. and the mixture stirred for 30 minutes. Methyl iodide was then added (0.155 mL, 2.48 mmol) and the reaction mixture slowly warmed to room temperature over 1.5 hours. The reaction mixture was then left to stir at room temperature for 18 hours before quenching with a saturated solution of NH4Cl (20 mL). EtOAc (20 mL) was then added and the layers separated. The aqueous layer was further extracted with EtOAc (2×20 mL). The solvent was removed in vacuo to give a brown oil which was purified by column chromatography on silica gel (0-5% EtOAc in petroleum benzine 40-60° C.) to afford the title compound (I50) (0.297 g, 92%) as a yellow oil; 1H NMR (400 MHz, CDCl3) δ7.49-7.44 (m, 1H), 7.33-7.24 (m, peaks obscured by CDCl3), 7.21-7.17 (m, 1H), 4.25 (q, J=7.2 Hz, 1H), 3.67 (s, 3H), 1.51 (d, J=7.2 Hz, 3H), 0.26 (s, 9H).

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