4-Bromobenzaldehyde → HCID 12603087, compound

Participants

Reaction Steps

n-Hexyl magnesium bromide (2.0 M in Et2O, 27 mL, 54 mmol) was added to a solution of 4-bromobenzaldehyde (5.0 g, 27 mmol) in THF (20 mL) at 0° C. under nitrogen. After 1.5 h at 0° C., the reaction was quenched slowly with 3 N HCl (20 mL) and concentrated in vacuo. The residue was diluted with water (30 mL) and extracted with Et2O (3×150 mL). Combined extracts were dried (Na2SO4), filtered and concentrated in vacuo. Purification of the residue by flash column chromatography on silica gel (5%→10% EtOAc/Hex) afforded 5.6 g (76%) of 1-(4-bromophenyl)-heptan-1-ol. Step 2. Protection of the Alcohol as its MPM Ether Sodium hydride (60% wt. in oil, 0.991 g, 24.8 mmol) was added to a solution of the alcohol from step 1 (5.6 g, 20.6 mmol) in THF and DMF (2:1, 30 mL) at 0° C. under nitrogen. After 5 min at 0° C., the reaction was allowed to warm to rt and 4-methoxybenzyl chloride (3.4 mL, 25.0 mmol) was added. The reaction was then heated at 80° C. After 18 h at 80° C., the reaction was allowed to cool to rt, quenched with saturated aqueous NH4Cl (50 mL) and concentrated in vacuo. The remainder was extracted with EtOAc (3×100 mL). The combined extracts were washed with water (2×100 mL) and brine (75 mL), then dried (Na2SO4), filtered and concentrated in vacuo. Purification of the residue by flash column chromatography on silica gel (2% EtOAc/Hex) afforded 7.5 g (93%) of the title compound.

Provenance & Evidence