Potassium Carbonate → (E)-ethyl 2-(4-(methoxymethoxy)phenyl)-3-o-tolylpent-2-enoate

関与物質

反応手順

A mixture of Ethyl 2-pentynoate (350 mg, 2.77 mmol), 1-iodo-4-(methoxymethoxy)benzene (1.46 g, 5.53 mmol), 2-Methylphenylboronic acid (753 mg, 5.53 mmol) and K2CO3 (766 mg, 5.54 mmol) in DMF (8.5 ml)-H2O (2.2 ml) was stirred at room temperature for 10 min. Then PdCl2(PhCN)2 (10.6 mg, 0.0276 mmol) was added under Ar atmosphere, and the mixture was stirred at room temperature for 24 h. The reaction was quenched with H2O under ice cooling, and the whole was extracted with Et2O. The organic layer was washed with H2O, brine, dried over Na2SO4, then concentrated. Purification by silica gel flash column chromatography (eluent: hexane/AcOEt, 30:1) gave 2a (27%). 2a: colorless oil; 1H-NMR (CDCl3) δ 1.02 (3H, t, J=7.5 Hz), 1.33 (3H, t, J=7.1 Hz), 2.04 (3H, s), 2.56 (2H, m), 3.42 (3H, s), 4.30 (2H, m), 5.06 (2H, s), 6.72 (2H, d, J=8.8 Hz), 6.88 (2H, d, J=8.8 Hz), 7.00-7.12 (5H, m).

情報源と証拠