Diethyl Ether → 3,4-Dihydro-4,4-dimethyl-6-acetyl-1-(1,1-dimethlethyl)naphthalene

HRID 2394197Notes

Reaction equation

HRID 2394197 reaction equation
[CH3:1][C:2]1([CH3:13])[C:11]2[C:6](=[CH:7][CH:8]=[CH:9][CH:10]=2)[C:5](=O)[CH2:4][CH2:3]1.[Li][C:15]([CH3:18])([CH3:17])[CH3:16].[CH3:19][CH2:20][O:21]CC>>[CH3:1][C:2]1([CH3:13])[C:11]2[C:6](=[CH:7][CH:8]=[C:9]([C:20](=[O:21])[CH3:19])[CH:10]=2)[C:5]([C:15]([CH3:18])([CH3:17])[CH3:16])=[CH:4][CH2:3]1

Participants

4

Reactant 3

HCID 3283Diethyl EtherHCID 2365474,4-Dimethyl-3,4-dihydro-2H-naphthalen-1-oneHCID 178418306HCID 178418306, compound

Product 1

HCID 225715533,4-Dihydro-4,4-dimethyl-6-acetyl-1-(1,1-dimethlethyl)naphthalene

Conditions

Temperature
-78 °C

Procedure

To a solution of 6-(2-methyl-1,3-dioxolan-2-yl)]-3,4-dihydro-4,4-dimethylnaphthlen-1(2H)-one ((Compound D15, 353 mg, 1.36 mmol) in 3 ml of dry ether at -78° C. was added dropwise t-BuLi (1 ml, 1.7 mmol, 1.7M solution in pentane). This clear light yellow solution was left at -78° C. for 30 min. Then, freshly distilled SOC12 (0.15 ml, 2.0 mmol) was added. The reaction mixture was stirred at -78° C. for additional 30 min and thereafter slowly warmed to room temperature. The reaction was quenched by addition of saturated NH4Cl. The white solids were removed by filtration and the clear solution was concentrated to an oil, and purified by column chromatography with ethyl acetate/hexane (1/10) to give the title compound as a yellow oil.

Workup

  1. additionThen, freshly distilled SOC12 (0.15 ml, 2.0 mmol) was added
  2. temperatureslowly warmed to room temperature
  3. customThe reaction was quenched by addition of saturated NH4Cl
  4. customThe white solids were removed by filtration
  5. concentrationthe clear solution was concentrated to an oil
  6. custompurified by column chromatography with ethyl acetate/hexane (1/10)

Sources & evidence

ORD record
ord-e21b4795b44747d88a13afd65c86c997
Source dataset
uspto-grants-1998_09
Patent number
US05808124

Reaction notes

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