Methyl iodide → (3,5-Dimethoxyphenyl)-(2,3,4-trimethoxyphenyl)methanone

Participants

Reaction Conditions

Reaction Steps

To a mixture of (3,5-dimethoxyphenyl)-(2-hydroxy-3,4-dimethoxyphenyl) methanone (1.59 g, 5.00 mmol) in DMF (25 ml) was added iodomethane (0.62 ml, 10.00 mmol), and powdered Na2CO3 (1.06 g, 10.00 mmol) at rt. The suspension was stirred at ˜35° C. overnight. DMF was evaporated in vacuo and to the residue was added CH2Cl2 (100 ml) and washed with H2O (3×80 ml). The white salt was filtered and the solution was washed with 5 N KOH (4×80 ml), H2O (1×80 ml), dried over MgSO4 and concentrated to a brown oil, which was purified via flash column chromatography (20% EtOAc in hexane) to give (3,5-dimethoxy-phenyl)-(2,3,4-trimethoxy-phenyl)methanone as a clear oil (1.49 g, 90%): 1HNMR (CDCl3) δ 7.12 (d, J=8 Hz, 1H, Ar), 6.94 (d, J=2 Hz, 2H, Ar), 6.71 (d, J=8 Hz, 1H, Ar), 6.65 (t, J=2 Hz, 1H, Ar), 3.93 (s, 3H, OCH3), 3.89 (s, 3H, OCH3), 3.81 (s, 6H, 2OCH3), 3.79 (s, 3H, OCH3); 13C NMR (CDCl3) δ 195.2, 160.7, 156.3, 152.9, 142.2, 140.5, 126.6, 125.1, 107.7, 106.8, 105.4, 62.0, 61.1, 56.3, 55.7; Anal. Calcd. For C18H20O6: C, 65.05; H, 6.07. Found: C, 64.93; H, 6.09. The product was carried over to the next step.

Provenance & Evidence