Phosphorus oxybromide → 1-Bromo-4-hydroxy-7-phenylsulfanyl-isoquinoline-3-carboxylic acid

HRID 1406126Notes

Reaction equation

HRID 1406126 reaction equation
C([O:5][C:6]([C:8]1[N:9]=[C:10](O)[C:11]2[C:16]([C:17]=1[OH:18])=[CH:15][CH:14]=[C:13]([S:19][C:20]1[CH:25]=[CH:24][CH:23]=[CH:22][CH:21]=1)[CH:12]=2)=[O:7])CCC.C(OC(C1N=CC2C(C=1O)=CC=C(OC1C=CC(OC)=CC=1)C=2)=O)CCC.P(Br)(Br)([Br:56])=O>C(#N)C>[Br:56][C:10]1[C:11]2[C:16](=[CH:15][CH:14]=[C:13]([S:19][C:20]3[CH:25]=[CH:24][CH:23]=[CH:22][CH:21]=3)[CH:12]=2)[C:17]([OH:18])=[C:8]([C:6]([OH:5])=[O:7])[N:9]=1

Participants

5

Reactant 3

HCID 24613Phosphorus oxybromideHCID 667126187-(4-Methoxy-phenoxy)-4-hydroxy-isoquinoline-3-carboxylic acid butyl esterHCID 178450860HCID 178450860, compound

Product 1

HCID 860145681-Bromo-4-hydroxy-7-phenylsulfanyl-isoquinoline-3-carboxylic acid

Reagents, catalysts & solvents 1

HCID 6342AcetonitrileSolvent

Procedure

1,4-Dihydroxy-7-phenylsulfanyl-isoquinoline-3-carboxylic acid butyl ester (Example A-63 d) Compound A) (29.0 g) and phosphorous oxybromide (67.5 g) in 600 ml anhydrous acetonitrile was stirred at reflux for 4 hours. After cooling the reaction mixture was concentrated and saturated sodium bicarbonate solution and ethyl acetate were added to the residue and stirred overnight. Precipitate that formed between layers was collected and washed with water to give the title compound (10.2 g). MS-(+)-ion M+1=376.0, 378.1.

Workup

  1. temperatureat reflux for 4 hours
  2. temperatureAfter cooling the reaction mixture
  3. concentrationwas concentrated
  4. additionsaturated sodium bicarbonate solution and ethyl acetate were added to the residue
  5. customPrecipitate that formed between layers
  6. customwas collected
  7. washwashed with water

Sources & evidence

ORD record
ord-409f9c618ce7469a9cb07fb9e5f1eb90
Source dataset
uspto-grants-2014_12
Patent number
US08916585B2

Reaction notes

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