Lithium Hydroxide → 1-Ethyl-6,7-dimethoxy-4-((6-methoxy-2-(2,2,2-trifluoroethylamino)quinolin-3-yl)methyl)isoquinolin-3-ol dihydrochloride

HRID 1620224Notes

Reaction equation

HRID 1620224 reaction equation
[CH2:1]([C:3]1[C:12]2[C:7](=[CH:8][C:9]([O:15][CH3:16])=[C:10]([O:13][CH3:14])[CH:11]=2)[CH:6]=[C:5]([OH:17])[N:4]=1)[CH3:2].[ClH:18].[Cl:19][CH2:20][C:21]1[C:22]([NH:33][CH2:34][C:35]([F:38])([F:37])[F:36])=[N:23][C:24]2[C:29]([CH:30]=1)=[CH:28][C:27]([O:31][CH3:32])=[CH:26][CH:25]=2.[Li+].[OH-]>C1COCC1.C(Cl)Cl>[ClH:19].[ClH:18].[CH2:1]([C:3]1[C:12]2[C:7](=[CH:8][C:9]([O:15][CH3:16])=[C:10]([O:13][CH3:14])[CH:11]=2)[C:6]([CH2:20][C:21]2[C:22]([NH:33][CH2:34][C:35]([F:38])([F:36])[F:37])=[N:23][C:24]3[C:29]([CH:30]=2)=[CH:28][C:27]([O:31][CH3:32])=[CH:26][CH:25]=3)=[C:5]([OH:17])[N:4]=1)[CH3:2]

Participants

6

Reactant 3

HCID 3939Lithium HydroxideHCID 681821763-(Chloromethyl)-6-methoxy-N-(2,2,2-trifluoroethyl)quinolin-2-amine hydrochloride2×HCID 178437769HCID 178437769, compound2×

Product 1

HCID 1784377771-Ethyl-6,7-dimethoxy-4-((6-methoxy-2-(2,2,2-trifluoroethylamino)quinolin-3-yl)methyl)isoquinolin-3-ol dihydrochlorideYield 24%

Reagents, catalysts & solvents 2

HCID 6344DichloromethaneSolventHCID 8028TetrahydrofuranSolvent

Conditions

Temperature
160 °C

Procedure

To a stirred solution of 1-ethyl-6,7-dimethoxyisoquinolin-3-ol SLA 28136 (342 mg, 1.47 mmol) in THF (10 mL) in a 20 mL microwave vial equipped with a magnetic stirrer was added 3-(chloromethyl)-6-methoxy-N-(2,2,2-trifluoroethyl)quinolin-2-amine hydrochloride SLA 41070 (500 mg, 1.47 mmol) at RT followed by a 2 N aq. LiOH solution (1.47 mL, 2.94 mmol) and the mixture was stirred at 160° C. for 1.5 h under microwave irradiation. After cooling to RT, the mixture was diluted with CH2Cl2:MeOH=9:1 (150 mL), washed with brine (20 mL), dried over Na2SO4, filtered, and concentrated at 40° C. under vacuum. Purification by column chromatography (SiO2, eluent EtOAc:MeOH=100:0 to 97:3) followed by a second purification by column chromatography (SiO2, eluent CH2Cl2:MeOH=100:0 to 95:5) provided, after evaporation and drying, 233 mg of 1-ethyl-6,7-dimethoxy-4-((6-methoxy-2-(2,2,2-trifluoroethylamino)quinolin-3-yl)methyl)isoquinolin-3-ol as a brown solid. This free base was dissolved in CH2Cl2 (2 mL) in a 10 mL round-bottomed flask equipped with a magnetic stirrer before addition of a 0.49 M HCl solution in MeOH (3.05 mL). The reaction mixture was stirred for 5 min at RT then concentrated at 40° C. under vacuum to afford 1-ethyl-6,7-dimethoxy-4-((6-methoxy-2-(2,2,2-trifluoroethylamino)quinolin-3-yl)methyl)isoquinolin-3-ol dihydrochloride 45 as a yellow solid (200 mg, 24% yield).

Workup

  1. temperatureAfter cooling to RT
  2. washMeOH=9:1 (150 mL), washed with brine (20 mL)
  3. dry with materialdried over Na2SO4
  4. filtrationfiltered
  5. concentrationconcentrated at 40° C. under vacuum
  6. customPurification by column chromatography (SiO2, eluent EtOAc:MeOH=100:0 to 97:3)
  7. customfollowed by a second purification by column chromatography (SiO2, eluent CH2Cl2:MeOH=100:0 to 95:5)
  8. customprovided
  9. customafter evaporation
  10. customdrying
  11. dissolutionThis free base was dissolved in CH2Cl2 (2 mL) in a 10 mL round-bottomed flask
  12. customequipped with a magnetic stirrer before addition of a 0.49 M HCl solution in MeOH (3.05 mL)
  13. stirringThe reaction mixture was stirred for 5 min at RT
  14. concentrationthen concentrated at 40° C. under vacuum

Sources & evidence

ORD record
ord-5cb7effb509d470e8caff3f22914e9ba
Source dataset
uspto-grants-2014_07
Patent number
US08772316B2

Reaction notes

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