7,8-Dichloro-1,2,3,4-tetrahydroisoquinoline hydrochloride → 7,8-Dichloro-3,4-dihydroisoquinoline

HRID 2058428Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 2058428
N(S([O-])(=O)=O)(S([O-])(=O)=O)[O].[K+].[K+].Cl.[Cl:14][C:15]1[C:24]([Cl:25])=[C:23]2[C:18]([CH2:19][CH2:20][NH:21][CH2:22]2)=[CH:17][CH:16]=1>C(=O)([O-])[O-].[Na+].[Na+]>[Cl:14][C:15]1[C:24]([Cl:25])=[C:23]2[C:18]([CH2:19][CH2:20][N:21]=[CH:22]2)=[CH:17][CH:16]=1

Komponenten

4

Edukt 2

HCID 1239197,8-Dichloro-1,2,3,4-tetrahydroisoquinoline hydrochlorideHCID 3032624Potassium nitrosodisulfonate

Produkt 1

HCID 128184197,8-Dichloro-3,4-dihydroisoquinoline

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 10340Sodium CarbonateLösungsmittel2×

Versuchsvorschrift

To a mixture of 1 liter 5 percent aqueous sodium carbonate and 62.6 g. (0.233 mole) potassium nitrosodisulfonate was added 21.9 g. (0.092 mole) 7,8-dichloro-1,2,3,4-tetrahydroisoquinoline hydrochloride and then 0.1 liter 5 percent aqueous sodium carbonate. The reaction mixture was stirred at room temperature for 23 hours. The reaction mixture was then extracted with methylene chloride (3×250 ml.). The combined extract was washed with saturated sodium chloride solution, dried over anhydrous magnesium sulfate and filtered. The filtrate was concentrated to dryness under reduced pressure to afford a crude intermediate. The crude intermediate was recrystallized from ethyl acetate to yield 7,8-dichloro-3,4-dihydroisoquinoline as a yellow solid with a melting point of 56°-60° C. 7,8-Dichloro-3,4-dihydro isoquinoline was converted to the desired 7,8-dichloro-1-isopropyl-1,2,3,4-tetrahydroisoquinoline via a Grignard reaction with isopropylmagnesium iodide. 7,8-Dichloro-1-isopropyl-1,2,3,4-tetrahydroisoquinoline hydrochloride has a melting point of 196°-200° C.

Aufarbeitung

  1. extractionThe reaction mixture was then extracted with methylene chloride (3×250 ml.)
  2. extractionThe combined extract
  3. washwas washed with saturated sodium chloride solution
  4. dry with materialdried over anhydrous magnesium sulfate
  5. filtrationfiltered
  6. concentrationThe filtrate was concentrated to dryness under reduced pressure
  7. customto afford a crude intermediate
  8. customThe crude intermediate was recrystallized from ethyl acetate

Quellen und Nachweise

ORD-Eintrag
ord-834bd13d095941d1afc95ab219d50cde
Quelldatensatz
uspto-grants-1982_03
Patentnummer
US04317826

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