Potassium Hydroxide → HCID 178486670, compound

HRID 1620153Notes

Reaction equation

HRID 1620153 reaction equation
[CH3:1][O:2][C:3]1[CH:4]=[C:5]2[C:10](=[CH:11][C:12]=1[O:13][CH3:14])[C:9]([CH3:15])=[N:8][C:7]([OH:16])=[CH:6]2.[OH-].[K+].Br.Br[CH2:21][C:22]1[CH:27]=[CH:26][N:25]=[CH:24][CH:23]=1>C1(C)C=CC=CC=1.O.C(Cl)Cl>[CH3:1][O:2][C:3]1[CH:4]=[C:5]2[C:10](=[CH:11][C:12]=1[O:13][CH3:14])[C:9]([CH3:15])=[N:8][C:7]([OH:16])=[C:6]2[CH2:21][C:22]1[CH:27]=[CH:26][N:25]=[CH:24][CH:23]=1

Participants

7

Reactant 3

HCID 14797Potassium HydroxideHCID 127522194-(Bromomethyl)pyridine hbrHCID 178486704HCID 178486704, compound2×

Product 1

HCID 178486670HCID 178486670, compound

Reagents, catalysts & solvents 3

HCID 962WaterSolventHCID 1140TolueneSolventHCID 6344DichloromethaneSolvent

Conditions

Temperature
110 °C

Procedure

To a solution of 6,7-dimethoxy-1-methylisoquinolin-3-ol CCH 18060 (197 mg, 899 μmol) in toluene (10 mL) in a 20 mL microwave vial equipped with a magnetic stirrer was added a 2 N aq. KOH solution (1.20 mL, 2.40 mmol) at RT followed by 4-(bromomethyl)pyridine hydrobromide (250 mg, 988 μmol) and the mixture was stirred at 110° C. for 15 min under microwave irradiation. After cooling to RT, the mixture was diluted with H2O (5 mL) before extraction with CH2Cl2 (50 mL). The organic layer was washed with brine (10 mL), dried over Na2SO4, filtered and concentrated at 40° C. under vacuum. Purification by column chromatography (SiO2, eluent CH2Cl2:MeOH=100:0 to 90:10) gave 70 mg of 6,7-dimethoxy-1-methyl-4-(pyridin-4-ylmethyl)isoquinolin-3-ol as a yellow solid. This free base was dissolved in MeOH (5 mL) in a 25 mL round-bottomed flask equipped with a magnetic stirrer before addition of a 0.15 M HCl solution in MeOH (7 mL). The reaction mixture was stirred for 5 min at RT and concentrated at 40° C. under vacuum to afford 6,7-dimethoxy-1-methyl-4-(pyridin-4-ylmethyl)isoquinolin-3-ol hydrochloride 11 as a yellow solid (78 mg, 25% yield).

Workup

  1. temperatureAfter cooling to RT
  2. washThe organic layer was washed with brine (10 mL)
  3. dry with materialdried over Na2SO4
  4. filtrationfiltered
  5. concentrationconcentrated at 40° C. under vacuum
  6. customPurification by column chromatography (SiO2, eluent CH2Cl2:MeOH=100:0 to 90:10)

Sources & evidence

ORD record
ord-9636f8b8d59e437c83b5bb5eab6630ff
Source dataset
uspto-grants-2014_07
Patent number
US08772316B2

Reaction notes

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