1-(1-Ethylpiperazin-4-yl)-3-bromoisoquinoline → 1-(4-Ethylpiperazin-1-yl)-3-[4-(1-ethoxycarbonylpropan-2-yl)phenyl]isoquinoline

HRID 1251242Notes

Reaction equation

HRID 1251242 reaction equation
C([Sn](CCCC)(CCCC)[C:6]1[CH:11]=[CH:10][C:9]([CH:12]([CH3:19])[CH2:13][C:14]([O:16][CH2:17][CH3:18])=[O:15])=[CH:8][CH:7]=1)CCC.Br[C:29]1[N:30]=[C:31]([N:39]2[CH2:44][CH2:43][N:42]([CH2:45][CH3:46])[CH2:41][CH2:40]2)[C:32]2[C:37]([CH:38]=1)=[CH:36][CH:35]=[CH:34][CH:33]=2>C1(C)C(C)=CC=CC=1.C(OCC)(=O)C.C1C=CC([P]([Pd]([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)[P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1>[CH2:45]([N:42]1[CH2:41][CH2:40][N:39]([C:31]2[C:32]3[C:37](=[CH:36][CH:35]=[CH:34][CH:33]=3)[CH:38]=[C:29]([C:6]3[CH:7]=[CH:8][C:9]([CH:12]([CH3:19])[CH2:13][C:14]([O:16][CH2:17][CH3:18])=[O:15])=[CH:10][CH:11]=3)[N:30]=2)[CH2:44][CH2:43]1)[CH3:46]

Participants

6

Reactant 2

HCID 225024471-(1-Ethylpiperazin-4-yl)-3-bromoisoquinolineHCID 22502763Ethyl 3-(4-Tributylstannylphenyl)butyrate

Product 1

HCID 225031761-(4-Ethylpiperazin-1-yl)-3-[4-(1-ethoxycarbonylpropan-2-yl)phenyl]isoquinolineYield 74.8%

Reagents, catalysts & solvents 3

HCID 178418397HCID 178418397, compoundCatalystHCID 7237O-XyleneSolventHCID 8857Ethyl AcetateSolvent

Procedure

Ethyl 3-(4-Tributylstannylphenyl)butyrate (5.46 g) and 3-bromo-1-(4-ethylpiperazin-1-yl)isoquinoline (1.33 g) were heated under reflux overnight in the presence of tetrakistriphenylphosphinepalladium(0) (0.19 g) in xylene in nitrogen atmosphere. After cooling, the reaction solution was diluted with ethyl acetate and filtered. The filtrate was extracted with 2N hydrochloric acid. The aqueous layer was washed with ethyl acetate, adjusted to pH 10 with a 8N aqueous solution of sodium hydroxide, and then extracted in ethyl acetate. The organic layer was washed with a 10% aqueous solution of sodium carbonate and brine, and dried over magnesium sulfate. The solvent was evaporated, and the resulting residue was purified by silica gel column chromatography (chloroform/methanol system), to give 1-(4-ethylpiperazin-1-yl)-3-[4-(1-ethoxycarbonylpropan-2-yl)phenyl]isoquinoline (1.34 g) as a pale yellow viscous oil.

Workup

  1. temperatureAfter cooling
  2. filtrationfiltered
  3. extractionThe filtrate was extracted with 2N hydrochloric acid
  4. washThe aqueous layer was washed with ethyl acetate
  5. extractionextracted in ethyl acetate
  6. washThe organic layer was washed with a 10% aqueous solution of sodium carbonate and brine
  7. dry with materialdried over magnesium sulfate
  8. customThe solvent was evaporated
  9. customthe resulting residue was purified by silica gel column chromatography (chloroform/methanol system)

Sources & evidence

ORD record
ord-29a9140a082f4b5a9d2c375c86213e5a
Source dataset
uspto-grants-2002_01
Patent number
US06340759B1

Reaction notes

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