Androsta-1,4-diene-3,17-dione → (8'R,9'S,10'R,13'S,14'S)-10',13'-dimethylspiro[1,3-dioxolane-2,17'-7,8,9,11,12,14,15,16-octahydro-6H-cyclopenta[a]phenanthrene]-3'-one

HRID 2374131Notes

Reaction equation

HRID 2374131 reaction equation
[CH3:1][C@:2]12[CH2:19][CH2:18][C@H:17]3[C@@H:7]([CH2:8][CH2:9][C:10]4[C@:15]3([CH3:16])[CH:14]=[CH:13][C:12](=[O:20])[CH:11]=4)[C@@H:6]1[CH2:5][CH2:4][C:3]2=[O:21].[OH2:22].[C:23]1([CH3:33])C=CC(S(O)(=O)=O)=CC=1>C1C=CC=CC=1.C(O)CO>[CH2:33]1[CH2:23][O:22][C:3]2([CH2:4][CH2:5][C@H:6]3[C@H:7]4[C@H:17]([CH2:18][CH2:19][C@:2]23[CH3:1])[C@:15]2([CH3:16])[C:10](=[CH:11][C:12](=[O:20])[CH:13]=[CH:14]2)[CH2:9][CH2:8]4)[O:21]1

Participants

5

Reactant 2

HCID 13472Androsta-1,4-diene-3,17-dioneHCID 521998p-Toluenesulfonic acid monohydrate

Product 1

HCID 7061039(8'R,9'S,10'R,13'S,14'S)-10',13'-dimethylspiro[1,3-dioxolane-2,17'-7,8,9,11,12,14,15,16-octahydro-6H-cyclopenta[a]phenanthrene]-3'-oneYield 95%

Reagents, catalysts & solvents 2

HCID 174Ethylene GlycolSolventHCID 241BenzeneSolvent

Procedure

To a solution of androsta-1,4-dien-3,17-dione (1, 10.0 g) in benzene (600 ml) and ethylene glycol (90 ml) was added toluene-p-sulfonic acid monohydrate (0.3 g), and the solution was refluxed for 8-10 hours with a Dean-Stark apparatus for collecting water. The reaction mixture was cooled to room temperature, diluted with ethyl acetate and washed thoroughly with water, dilute sodium bicarbonate solution, water and finally with brine. The organic phase was dried over anhydrous magnesium sulfate, filtered and the organic solvent removed by rotary evaporator. The resultant solid was crystallized from methanol to give 17,17-ethylenedioxyandrosta-1,4-dien-3-one (2) as a white crystalline solid in 95% yield (11.0 g).

Workup

  1. temperaturethe solution was refluxed for 8-10 hours with a Dean-Stark apparatus
  2. customfor collecting water
  3. additiondiluted with ethyl acetate
  4. washwashed thoroughly with water, dilute sodium bicarbonate solution, water and finally with brine
  5. dry with materialThe organic phase was dried over anhydrous magnesium sulfate
  6. filtrationfiltered
  7. customthe organic solvent removed by rotary evaporator
  8. customThe resultant solid was crystallized from methanol

Sources & evidence

ORD record
ord-fef9890c67ea41a5b31b80e4d253eaa4
Source dataset
uspto-grants-2008_12
Patent number
US07462610B2

Reaction notes

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