Water → 1,2,4,9-Tetrahydrospiro[carbazole-3,2'-[1,3]dioxolane]

HRID 704891Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 704891
[CH2:1]1[O:11][C:4]2([CH2:9][CH2:8][C:7](=O)[CH2:6][CH2:5]2)[O:3][CH2:2]1.[C:12]1([NH:18]N)[CH:17]=[CH:16][CH:15]=[CH:14][CH:13]=1.S([O-])([O-])(=O)=O.[Mg+2].O>C(Cl)Cl.[Cl-].[Zn+2].[Cl-]>[CH2:2]1[CH2:1][O:11][C:4]2([CH2:9][C:8]3[C:17]4[C:12](=[CH:13][CH:14]=[CH:15][CH:16]=4)[NH:18][C:7]=3[CH2:6][CH2:5]2)[O:3]1

Komponenten

7

Edukt 4

HCID 962WaterHCID 7516PhenylhydrazineHCID 24083Sulfuric acid magnesium salt (1:1)HCID 5674151,4-Dioxaspiro[4.5]decan-8-one

Produkt 1

HCID 14872651,2,4,9-Tetrahydrospiro[carbazole-3,2'-[1,3]dioxolane]

Reagenzien, Katalysatoren, Lösungsmittel 2

HCID 3007855ZincchlorideKatalysatorHCID 6344DichloromethaneLösungsmittel

Versuchsvorschrift

77.2 g (0.5 mol) of 1,4-cyclohexanedione monoethylene ketal are dissolved together with 48.4 ml (0.5 mol) of phenylhydrazine in 2 l of methylene chloride, and 300 g of magnesium sulphate are added, and the mixture is stirred for 30 min. The magnesium sulphate is then filtered off with suction, washed with methylene chloride, and the filtrate is evaporated. The residue is taken up in 1.5 l of benzene, and 62.1 g (0.46 mol) of anhydrous zinc chloride are added and the mixture is heated under reflux with a water separator for 3 h. The reaction solution is then concentrated, 2N sodium hydroxide solution is added, and the mixture is extracted 3 times with ethyl acetate The combined ethyl acetate phases are dried with sodium sulphate and evaporated. The residue crystallizes from a little ether. In this way 3.5 g (72.9% of theory) of the product are obtained.

Aufarbeitung

  1. additionare added
  2. filtrationThe magnesium sulphate is then filtered off with suction
  3. washwashed with methylene chloride
  4. customthe filtrate is evaporated
  5. temperaturethe mixture is heated
  6. waitseparator for 3 h
  7. concentrationThe reaction solution is then concentrated
  8. addition2N sodium hydroxide solution is added
  9. extractionthe mixture is extracted 3 times with ethyl acetate The combined ethyl acetate phases
  10. dry with materialare dried with sodium sulphate
  11. customevaporated
  12. customThe residue crystallizes from a little ether
  13. customIn this way 3.5 g (72.9% of theory) of the product are obtained

Quellen und Nachweise

ORD-Eintrag
ord-c98877d233e24e32b2e0e0ca379b5b1b
Quelldatensatz
uspto-grants-1991_01
Patentnummer
US04988820

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