Reaction Steps
Bromocyclohexane (8.0 mL, 66 mmol) was added to a suspension of vanillin (5.0 g, 33 mmol), potassium carbonate (13.6 g, 99 mmol) and sodium iodide (0.49 g, 3.3 mmol) in EtOH (75 mL) and treated according to Procedure 3 for 64 h. The crude product was purified by flash chromatography with 10-15% EtOAc/petrol as eluent to give 4-cyclohexyloxy-3-methoxybenzaldehyde (2.8 g, 37%) as a pale yellow oil; δH (400 MHz, CDCl3) 1.27-1.43 (m, 4H, CH2), 1.56 (m, 2H, CH2), 1.85 (m, 2H, CH2), 2.06 (m, 2H, CH2), 3.91 (s, 3H, OCH3), 4.37 (tt, J=9.4, 3.6 Hz, 1H, OCH), 6.98 (d, J5,6=8.0 Hz, 1H, H5), 7.40 (d, J2,6=2.0 Hz, 1H, H2), 7.42 (dd, J5,6=8.0, J2,6=2.0 Hz, 1H, H6), 9.83 (s, 1H, CHO); do (100 MHz, CDCl3) 23.9, 25.4, 31.6, 56.0, 76.9, 109.8, 113.2, 126.5, 129.7, 150.5, 153.0, 190.8; vmax 1133, 1263, 1504, 1581, 1680, 2857, 2933 cm−1.
