Pyridine → 17-Methylenestra-1,3,5(10)-trien-3-yl acetate

HRID 1781941Notes

Reaction equation

HRID 1781941 reaction equation
[CH2:1]=[C:2]1[CH2:7][CH2:6][C@H:5]2[C@H:8]3[C@H:17]([CH2:18][CH2:19][C@:3]12[CH3:4])[C:16]1[CH:15]=[CH:14][C:13]([OH:20])=[CH:12][C:11]=1[CH2:10][CH2:9]3.N1C=CC=CC=1.[C:27](OC(=O)C)(=[O:29])[CH3:28]>C(OCC)(=O)C>[C:27]([O:20][C:13]1[CH:14]=[CH:15][C:16]2[C@@H:17]3[C@H:8]([C@H:5]4[C@@:3]([CH2:19][CH2:18]3)([CH3:4])[C:2](=[CH2:1])[CH2:7][CH2:6]4)[CH2:9][CH2:10][C:11]=2[CH:12]=1)(=[O:29])[CH3:28]

Participants

5

Reactant 3

HCID 1049PyridineHCID 7918Acetic AnhydrideHCID 1445855217-Methylene-estra-1,3,5(10)-trien-3-ol

Product 1

HCID 1864230517-Methylenestra-1,3,5(10)-trien-3-yl acetate

Reagents, catalysts & solvents 1

HCID 8857Ethyl AcetateSolvent

Procedure

A solution of 17-methylenestra-1,3,5(10)-trien-3-ol (10, 5.84 g, 21.8 mmol) in anh. pyridine (32 mL, 0.40 mol) and acetic anhydride (9.7 mL, 0.10 mol) was stirred 24, after which ethyl acetate (250 mL) was added. See FIG. 17. The mixture was washed with three 100 mL portions of 1N hydrochloric acid+100 mL of saturated sodium bicarbonate+100 mL of saturated copper sulfate+100 mL of brine, dried over magnesium sulfate, and filtered through diatomaceous earth. The residue was washed with 25 mL of ethyl acetate and the combined filtrates were concentrated under reduced pressure. Recrystallization from aqueous ethanol gave lustrous white platelets (5.84 g, 18.8 mmol), m.p. 77°-79° C. (NA-1994A-248B)

Workup

  1. washThe mixture was washed with three 100 mL portions of 1N hydrochloric acid+100 mL of saturated sodium bicarbonate+100 mL of saturated copper sulfate+100 mL of brine
  2. dry with materialdried over magnesium sulfate
  3. filtrationfiltered through diatomaceous earth
  4. washThe residue was washed with 25 mL of ethyl acetate
  5. concentrationthe combined filtrates were concentrated under reduced pressure
  6. customRecrystallization from aqueous ethanol
  7. customgave lustrous white platelets (5.84 g, 18.8 mmol), m.p. 77°-79° C. (NA-1994A-248B)

Sources & evidence

ORD record
ord-d81d78f7d3a948e5a0a669fa1bb5c419
Source dataset
uspto-grants-1997_05
Patent number
US05633392

Reaction notes

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