Sodium Carbonate → 9-Hydroxy-7-(3-methyl-2-octyl)-2,2,-dimethyl-4-oxo-1,2,3,4-tetrahydrocyclopenta[c] [1]benzopyran

HRID 436047Notes

Reaction equation

HRID 436047 reaction equation
[CH3:1][CH:2]([CH2:13][CH2:14][CH2:15][CH2:16][CH3:17])[CH:3]([C:5]1[CH:6]=[C:7]([OH:12])[CH:8]=[C:9]([CH:11]=1)[OH:10])[CH3:4].[CH3:18][C:19]1([CH3:30])[CH2:23][C:22](=O)[CH:21]([C:25](OCC)=[O:26])[CH2:20]1.P(Cl)(Cl)(Cl)=O.C(=O)([O-])[O-].[Na+].[Na+]>C1C=CC=CC=1>[OH:10][C:9]1[C:8]2[C:22]3[CH2:23][C:19]([CH3:30])([CH3:18])[CH2:20][C:21]=3[C:25](=[O:26])[O:12][C:7]=2[CH:6]=[C:5]([CH:3]([CH:2]([CH3:1])[CH2:13][CH2:14][CH2:15][CH2:16][CH3:17])[CH3:4])[CH:11]=1

Participants

6

Reactant 4

HCID 10340Sodium CarbonateHCID 24813Phosphorus oxychlorideHCID 2581765-(3-Methyloctan-2-yl)benzene-1,3-diolHCID 11735559Ethyl 4,4-dimethyl-2-oxocyclopentane-1-carboxylate

Product 1

HCID 541338539-Hydroxy-7-(3-methyl-2-octyl)-2,2,-dimethyl-4-oxo-1,2,3,4-tetrahydrocyclopenta[c] [1]benzopyran

Reagents, catalysts & solvents 1

HCID 241BenzeneSolvent

Procedure

To 13.5 g. of 5-(3-methyl-2-octyl)-resorcinol and 10.5 g. of 4,4-dimethyl-2-carboethoxycyclopentanone [Canadian J. of Chem. 47, 1982-1988 (1969)] in 59 ml. of benzene was added 4.3 ml. of phosphorous oxychloride with stirring and refluxing for 6 hours. After the red solution was allowed to stand at room temperature for 8 hours, it was added to an ice and sodium carbonate solution. The colorless mixture was extracted with ether, dried over magnesium sulfate and concentrated. The mixture was extracted with cold pentane and the pentane was discarded. The residue [9-hydroxy-7-(3-methyl-2-octyl)-2,2,-dimethyl-4-oxo-1,2,3,4-tetrahydrocyclopenta[c] [l]benzopyran] was obtained as a gummy solid.

Workup

  1. temperaturerefluxing for 6 hours
  2. extractionThe colorless mixture was extracted with ether
  3. dry with materialdried over magnesium sulfate
  4. concentrationconcentrated
  5. extractionThe mixture was extracted with cold pentane

Sources & evidence

ORD record
ord-29ab9c84a4d24591b1c41551b2af34cc
Source dataset
uspto-grants-1977_02
Patent number
US04007207

Reaction notes

Loading…