Tin tetrachloride → Ethyl 6-bromo-2-(phenylsulfonyl)-1,2,3,4-tetrahydro-1-isoquinolinecarboxylate

HRID 2423528Notes

Reaction equation

HRID 2423528 reaction equation
[Sn](Cl)(Cl)(Cl)Cl.[Br:6][C:7]1[CH:8]=[C:9]([CH2:13][CH2:14][NH:15][S:16]([C:19]2[CH:24]=[CH:23][CH:22]=[CH:21][CH:20]=2)(=[O:18])=[O:17])[CH:10]=[CH:11][CH:12]=1.Cl[CH:26](SC)[C:27]([O:29][CH2:30][CH3:31])=[O:28]>ClCCl.ClCCCl>[Br:6][C:7]1[CH:8]=[C:9]2[C:10](=[CH:11][CH:12]=1)[CH:26]([C:27]([O:29][CH2:30][CH3:31])=[O:28])[N:15]([S:16]([C:19]1[CH:20]=[CH:21][CH:22]=[CH:23][CH:24]=1)(=[O:18])=[O:17])[CH2:14][CH2:13]2.[Br:6][C:7]1[CH:12]=[CH:11][CH:10]=[C:9]2[C:8]=1[CH:26]([C:27]([O:29][CH2:30][CH3:31])=[O:28])[N:15]([S:16]([C:19]1[CH:20]=[CH:21][CH:22]=[CH:23][CH:24]=1)(=[O:18])=[O:17])[CH2:14][CH2:13]2

Participants

7

Reactant 3

HCID 24287Tin tetrachlorideHCID 10877535Ethyl 2-chloro-2-(methylsulfanyl)acetateHCID 59321588N-[2-(3-bromophenyl)ethyl]benzenesulfonamide

Product 2

HCID 59321554Ethyl 6-bromo-2-(phenylsulfonyl)-1,2,3,4-tetrahydro-1-isoquinolinecarboxylateYield 79%HCID 59321590Ethyl 8-bromo-2-(phenylsulfonyl)-1,2,3,4-tetrahydro-1-isoquinolinecarboxylateYield 19%

Reagents, catalysts & solvents 2

HCID 111,2-DichloroethaneSolventHCID 6344DichloromethaneSolvent

Procedure

Tin(IV)chloride (6.67 mL of a 1 M solution in dichloromethane, 6.67 mmol) was added to N-[2-(3-bromophenyl)ethyl]benzenesulfonamide (1.08 g, 3.17 mmol) and ethyl chloro(methylthio)acetate (1.07 g, 6.35 mmol) in 1,2-dichloroethane (11 mL) under argon and the reaction was heated at reflux for 3 hours. After cooling, the mixture was poured into ice water and extracted with ethyl acetate. The organic layer was washed with saturated sodium bicarbonate and brine, dried over anhydrous magnesium sulfate, then filtered and concentrated. The residue was purified by silica gel chromatography eluting with 1:4 ethyl acetate:hexanes to give 1.07 g (79%) of ethyl 6-bromo-2-(phenylsulfonyl)-1,2,3,4-tetrahydro-1-isoquinolinecarboxylate and 255.6 mg (19%) of ethyl 8-bromo-2-(phenylsulfonyl)-1,2,3,4-tetrahydro-1-isoquinolinecarboxylate as oils.

Workup

  1. temperaturethe reaction was heated
  2. temperatureat reflux for 3 hours
  3. temperatureAfter cooling
  4. extractionextracted with ethyl acetate
  5. washThe organic layer was washed with saturated sodium bicarbonate and brine
  6. dry with materialdried over anhydrous magnesium sulfate
  7. filtrationfiltered
  8. concentrationconcentrated
  9. customThe residue was purified by silica gel chromatography
  10. washeluting with 1:4 ethyl acetate

Sources & evidence

ORD record
ord-cf374c60b32f45cfa6cf4a4d05e4f2ab
Source dataset
uspto-grants-2011_06
Patent number
US07960552B2

Reaction notes

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