Hydrochloric Acid → 4-(Bromomethyl)-1-naphthaldehyde

HRID 587251Notes

Reaction equation

[Br:1][CH2:2][C:3]1[C:12]2[C:7](=[CH:8][CH:9]=[CH:10][CH:11]=2)[C:6]([C:13]#N)=[CH:5][CH:4]=1.CC(C[AlH]CC(C)C)C.Cl.[OH2:25]>C1(C)C=CC=CC=1>[Br:1][CH2:2][C:3]1[C:12]2[C:7](=[CH:8][CH:9]=[CH:10][CH:11]=2)[C:6]([CH:13]=[O:25])=[CH:5][CH:4]=1

Participants

Conditions

Temperature: 0 °C

Procedure

To a stirred solution of 4-(bromomethyl)-1-naphthonitrile (8 g, 33 mmol) in toluene (100 mL) at 0° C. was added dropwise DIBAL-H (1.0 M solution in toluene; 43 mL), and the reaction mixture was stirred at 0° C. for 1 h. 3 N HCl in water (50 mL) was added to the mixture until it became a white slurry and then additional 1 N HCl (20 mL) was added. The organic layer was collected and the aqueous layer was extracted with EtOAc (3 x100 mL). The combined organic layer was dried over Na2SO4 and concentrated under reduced pressure. Purification by flash column chromatography (SiO2, 100-200 mesh; 5% EtOAc in petroleum ether) afforded the title compound as a white solid (7 g, 88%): mp 115-116° C.; 1H NMR (400 MHz, CDCl3) δ 10.41 (s, 1H), 9.35 (m, 1H), 8.22 (m, 1H), 7.90 (d, J=8.0 Hz, 1H), 7.75 (m, 3H), 4.95 (s, 2H); ESIMS m/z 248.88 ([M+H]+).

Workup

customThe organic layer was collected
extractionthe aqueous layer was extracted with EtOAc (3 x100 mL)
dry with materialThe combined organic layer was dried over Na2SO4
concentrationconcentrated under reduced pressure
customPurification by flash column chromatography (SiO2, 100-200 mesh; 5% EtOAc in petroleum ether)

Sources & evidence

ORD record: ord-60e705ad11b742a7a0f815eb374f1ad6
Source dataset: uspto-grants-2016_01
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09226500B2

Reaction notes

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