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

HRID 704891ノート

反応式

HRID 704891 の反応式
[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

参加物

7

反応物 4

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

生成物 1

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

試薬・触媒・溶媒 2

HCID 3007855Zincchloride触媒HCID 6344Dichloromethane溶媒

実験手順

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.

後処理

  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

出典と根拠

ORDレコード
ord-c98877d233e24e32b2e0e0ca379b5b1b
出典データセット
uspto-grants-1991_01
特許番号
US04988820

反応ノート

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