2-((Acetyloxy)methoxy)ethyl acetate → 2-((2,6-Dichloro-9H-purin-9-yl)methoxy)ethyl acetate

HRID 614935

Reaction equation

HRID 614935 reaction equation
[Cl:1][C:2]1[N:10]=[C:9]2[C:5]([NH:6][CH:7]=[N:8]2)=[C:4]([Cl:11])[N:3]=1.C(O[CH2:16][O:17][CH2:18][CH2:19][O:20][C:21](=[O:23])[CH3:22])(=O)C>>[Cl:1][C:2]1[N:10]=[C:9]2[C:5]([N:6]=[CH:7][N:8]2[CH2:16][O:17][CH2:18][CH2:19][O:20][C:21](=[O:23])[CH3:22])=[C:4]([Cl:11])[N:3]=1

Participants

3

Reactant 2

HCID 1009992-((Acetyloxy)methoxy)ethyl acetateHCID 53244122,6-Dichloropurine

Product 1

HCID 3876662-((2,6-Dichloro-9H-purin-9-yl)methoxy)ethyl acetateYield 64%

Conditions

Temperature
138 °C

Procedure

2,6-Dichloropurine 5.5 g and 2-oxa-1,4-butanediol diacetate 513 g were placed in a flask and partially evacuated and then heated to 138° C., initially the mixture was too thick to stir but gradually gave rise to a melt which was stirred, and after 20 minutes was completely melted and the reaction mixture heated for 10 minutes more (total heat time = 30 minutes). The mixture was then cooled to room temperature and para-toluenesulphonic acid 150 mg was added, the vacuum reapplied and heating resumed with stirring. After 20 minutes heating vigorous bubbling was noted; the mixture was cooled to room temperature; chloroform was added, and the solution was extracted once with saturated aqueous sodium bicarbonate and once with water. The chloroform phase was dried over anhydrous sodium sulphate and evaporated. The residual oil was dissolved in benzene and applied to a column of 200 g. of silica gel in benzene. Benzene elution removed the acetate by-products. Ether elution gave 2,6-dichloro-9-(2-acetyloxyethoxymethyl)purine (64% yield). Recrystallization from benzene gave lustrous white flakes, m.p. 96°-99° C.

Workup

  1. custompartially evacuated
  2. stirringgradually gave rise to a melt which was stirred
  3. temperaturethe reaction mixture heated for 10 minutes more (total heat time = 30 minutes)
  4. temperatureThe mixture was then cooled to room temperature
  5. additionpara-toluenesulphonic acid 150 mg was added
  6. temperatureheating
  7. stirringwith stirring
  8. temperatureAfter 20 minutes heating vigorous
  9. custombubbling
  10. temperaturethe mixture was cooled to room temperature
  11. additionchloroform was added
  12. extractionthe solution was extracted once with saturated aqueous sodium bicarbonate and once with water
  13. dry with materialThe chloroform phase was dried over anhydrous sodium sulphate
  14. customevaporated
  15. dissolutionThe residual oil was dissolved in benzene
  16. washBenzene elution
  17. customremoved the acetate by-products
  18. washEther elution

Sources & evidence

ORD record
ord-91a61dff7ed74990bd5ab0d5dcf9535d
Source dataset
uspto-grants-1979_03
Patent number
US04146715

Linked notes

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