Potassium Hydroxide → HCID 178486660, compound

HRID 1620168Notes

Reaction equation

HRID 1620168 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+].Cl.Cl[CH2:21][C:22]1[CH:31]=[CH:30][C:29]2[C:24](=[CH:25][CH:26]=[CH:27][CH:28]=2)[N:23]=1>C1(C)C=CC=CC=1.O>[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:31]=[CH:30][C:29]2[C:24](=[CH:25][CH:26]=[CH:27][CH:28]=2)[N:23]=1

Participants

6

Reactant 3

HCID 14797Potassium Hydroxide2×HCID 30838232-(Chloromethyl)quinoline hydrochloride2×HCID 178486704HCID 178486704, compound2×

Product 1

HCID 178486660HCID 178486660, compound

Reagents, catalysts & solvents 2

HCID 962WaterSolventHCID 1140TolueneSolvent

Conditions

Temperature
115 °C

Procedure

To a solution of 6,7-dimethoxy-1-methylisoquinolin-3-ol CCH 18060 (147 mg, 0.67 mmol) in toluene (3 mL) in a 10 mL microwave vial equipped with a magnetic stirrer was added a 2 N aq. KOH solution (0.70 mL, 1.40 mmol) at RT followed by 2-(chloromethyl)quinoline hydrochloride (158 mg, 0.74 mmol) and the mixture was stirred at 115° C. for 25 min under microwave irradiation. Another portion of a 2 N aq. KOH solution (0.30 mL, 0.60 mmol) was then added at RT followed by 2-(chloromethyl)quinoline hydrochloride (70 mg, 0.33 mmol) and the mixture was stirred at 115° C. for 10 min under microwave irradiation. After cooling to RT, the mixture was diluted with H2O (5 mL) and neutralised with a 10% aqueous citric acid solution before extraction with CH2Cl2 (50 mL). The organic phase 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 100:7) gave 49 mg of 6,7-dimethoxy-1-methyl-4-(quinolin-2-ylmethyl)isoquinolin-3-ol as a yellow solid. The free base (45 mg) was dissolved in MeOH (10 mL) in a 25 mL round-bottomed flask equipped with a magnetic stirrer before addition of a 0.09 M HCl solution in MeOH (5.5 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-(quinolin-2-ylmethyl)isoquinolin-3-ol hydrochloride 23 as a yellow solid (54 mg, 19% yield).

Workup

  1. stirringthe mixture was stirred at 115° C. for 10 min under microwave irradiation
  2. temperatureAfter cooling to RT
  3. extractionneutralised with a 10% aqueous citric acid solution before extraction with CH2Cl2 (50 mL)
  4. washThe organic phase was washed with brine (10 mL)
  5. dry with materialdried over Na2SO4
  6. filtrationfiltered
  7. concentrationconcentrated at 40° C. under vacuum
  8. customPurification by column chromatography (SiO2, eluent CH2Cl2:MeOH=100:0 to 100:7)

Sources & evidence

ORD record
ord-8bb7e7a32acc4906b485a954b61503d7
Source dataset
uspto-grants-2014_07
Patent number
US08772316B2

Reaction notes

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