Hydrochloric Acid → (1r)-1-(3,3-Dimethylbutyl)-4-hydroxy-1-methylnaphthalen-2(1h)-one

HRID 2224910Notes

Reaction equation

[CH3:1][C:2]([CH3:24])([CH3:23])[CH2:3][CH2:4][C@:5]1([CH3:22])[C:14]2[C:9](=[CH:10][CH:11]=[CH:12][CH:13]=2)[C:8]([OH:15])=[C:7](C(OCC)=O)[C:6]1=[O:21].Cl>O1CCOCC1>[CH3:1][C:2]([CH3:24])([CH3:23])[CH2:3][CH2:4][C@:5]1([CH3:22])[C:14]2[C:9](=[CH:10][CH:11]=[CH:12][CH:13]=2)[C:8]([OH:15])=[CH:7][C:6]1=[O:21]

Participants

Conditions

Temperature: 25 °C

Procedure

A solution of Example 49C (2.65 g, 8.02 mmol) in 1,4-dioxane (25 mL) was treated with aqueous 1 N hydrochloric acid solution (25 mL) and refluxed for 3 hours. The mixture was cooled to 25° C. and partitioned between ethyl acetate and water. The ethyl acetate layer was washed with water and brine, dried with sodium sulfate, filtered, and concentrated in vacuo. The residue was triturated in hot hexane and dried to give 1.62 g (61%) of the title compound. 1H NMR (300 MHz, CDCl3): δ ppm 0.43 m, 0.5 H) 0.83 m, 10 H) 1.06 (m, 0.5 H) 1.51 (s, 1.5 H) 1.56 (s, 1.5 H) 1.83 m, 1 H) 2.02 m, 0.5 H) 2.26 m, 0.5 H) 3.74 (s, 1 H) 6.09 (s, 0.5 H) 7.51 m, 3 H) 8.10 (td, J=7.81, 1.29 Hz, 1 H); MS (ESI−) m/z 257 (M−H)−.

Workup

temperaturerefluxed for 3 hours
custompartitioned between ethyl acetate and water
washThe ethyl acetate layer was washed with water and brine
dry with materialdried with sodium sulfate
filtrationfiltered
concentrationconcentrated in vacuo
customThe residue was triturated in hot hexane
customdried

Sources & evidence

ORD record: ord-5f98be9bf7144eca8d7c0c5e7a167a1b
Source dataset: uspto-grants-2008_05
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07378414B2

Reaction notes

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