Potassium Iodide → 6-Propoxy-1,2,3,4-tetrahydronaphthalen-1-one

HRID 594776Notes

Reaction equation

[OH:1][C:2]1[CH:3]=[C:4]2[C:9](=[CH:10][CH:11]=1)[C:8](=[O:12])[CH2:7][CH2:6][CH2:5]2.Br[CH2:14][CH2:15][CH3:16].[I-].[K+].C(=O)([O-])[O-].[K+].[K+]>C(#N)C>[CH2:14]([O:1][C:2]1[CH:3]=[C:4]2[C:9](=[CH:10][CH:11]=1)[C:8](=[O:12])[CH2:7][CH2:6][CH2:5]2)[CH2:15][CH3:16]

Participants

Conditions

Temperature: 122 °C

Procedure

6-Hydroxy-1-tetralone (2.0 g, 12.3 mmol), bromo-propane (2.24 mL, 24.7 mmol), potassium iodide (2.05 g, 12.3 mmol) and potassium carbonate (3.41 g, 24.7 mmol) were combined in ACN (50 mL) in a sealed vessel, and the reaction was stirred at 122° C. overnight. The reaction was cooled, filtered, and concentrated. Purification by silica gel chromatography (10-50% EtOAc/hexanes) gave 2.36 g (94%) of the title compound as a clear oil. 1H NMR (400 MHz, DMSO-d6): δ 1.04 (3H, t, J=7.4 Hz), 1.79-1.85 (2H, m), 2.09-2.14 (2H, m), 2.60 (2H, t, J=6.3 Hz), 2.88-2.93 (2H, t, J=6.5 Hz), 3.97 (2H, t, J=6.5 Hz), 6.69 (1H, d, J=2.3 Hz), 6.81 (1H, dd, J=8.8, 4.1 Hz), 7.99 (1H, d, J=8.7 Hz). [M+H] calc'd for C13H16O2, 205. found 205.

Workup

temperatureThe reaction was cooled
filtrationfiltered
concentrationconcentrated
customPurification by silica gel chromatography (10-50% EtOAc/hexanes)

Sources & evidence

ORD record: ord-d77f57e35d95440db898be93f76eacd0
Source dataset: uspto-grants-2016_01
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09242968B2

Reaction notes

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