Cornforth reagent → (4aS,8aR)-5-((R)-5-Hydroxy-1,5-dimethyl-hex-3-ynyl)-4a-methyl-3,4,4a,7,8,8a-hexahydro-2H-naphthalen-1-one

HRID 581608Notes

Reaction equation

HRID 581608 reaction equation
[OH:1][C:2]([CH3:21])([CH3:20])[C:3]#[C:4][CH2:5][C@H:6]([C:8]1[C@:9]2([CH3:19])[C@@H:14]([CH2:15][CH2:16][CH:17]=1)[C@@H:13]([OH:18])[CH2:12][CH2:11][CH2:10]2)[CH3:7].[Cr](O[Cr]([O-])(=O)=O)([O-])(=O)=O.[NH+]1C=CC=CC=1.[NH+]1C=CC=CC=1>C(Cl)Cl>[OH:1][C:2]([CH3:20])([CH3:21])[C:3]#[C:4][CH2:5][C@H:6]([C:8]1[C@:9]2([CH3:19])[C@@H:14]([CH2:15][CH2:16][CH:17]=1)[C:13](=[O:18])[CH2:12][CH2:11][CH2:10]2)[CH3:7]

Participants

4

Reactant 2

HCID 2724130Cornforth reagentHCID 86754179(1S,4aS,8aR)-5-[(R)-5-Hydroxy-1,5-dimethyl-hex-3-ynyl]-4a-methyl-1,2,3,4,4a,7,8,8a-octahydro-naphthalen-1-ol

Product 1

HCID 57031123(4aS,8aR)-5-((R)-5-Hydroxy-1,5-dimethyl-hex-3-ynyl)-4a-methyl-3,4,4a,7,8,8a-hexahydro-2H-naphthalen-1-oneYield 76.2%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

590 mg (2.03 mmol) of (1S,4aS,8aR)-5-[(R)-5-Hydroxy-1,5-dimethyl-hex-3-ynyl]-4a-methyl-1,2,3,4,4a,7,8,8a-octahydro-naphthalen-1-ol was dissolved in 10 ml of abs. CH2Cl2 and oxidized with 1.91 g (5.08 mmol) of pyridinium dichromate during 2 h at ambient temperature. Filtration over Celite, evaporation to dryness, and flash chromatography (SiO2, Hexane/AcOEt=7/3) produced 446 mg of the title compound as colorless oil.

Workup

  1. filtrationFiltration
  2. customover Celite, evaporation to dryness, and flash chromatography (SiO2, Hexane/AcOEt=7/3)

Sources & evidence

ORD record
ord-801ee2425ab64c68a676b37cdd669972
Source dataset
uspto-grants-1999_07
Patent number
US05919986

Reaction notes

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