Lithium Hydroxide → HCID 178440229, compound

HRID 1620228Notes

Reaction equation

HRID 1620228 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]([CH2:15][CH2:16][CH3:17])=[N:8][C:7]([OH:18])=[CH:6]2.Cl.Cl[CH2:21][C:22]1[C:23]([NH:35][CH2:36][CH3:37])=[N:24][C:25]2[C:30]([CH:31]=1)=[CH:29][C:28]([O:32][CH2:33][CH3:34])=[CH:27][CH:26]=2.[Li+].[OH-]>C1COCC1.C(Cl)Cl>[CH2:33]([O:32][C:28]1[CH:29]=[C:30]2[C:25](=[CH:26][CH:27]=1)[N:24]=[C:23]([NH:35][CH2:36][CH3:37])[C:22]([CH2:21][C:6]1[C:5]3[C:10](=[CH:11][C:12]([O:13][CH3:14])=[C:3]([O:2][CH3:1])[CH:4]=3)[C:9]([CH2:15][CH2:16][CH3:17])=[N:8][C:7]=1[OH:18])=[CH:31]2)[CH3:34]

Participants

6

Reactant 3

HCID 3939Lithium HydroxideHCID 681822793-(Chloromethyl)-6-ethoxy-N-ethylquinolin-2-amine hydrochloride2×HCID 178440211HCID 178440211, compound

Product 1

HCID 178440229HCID 178440229, compound

Reagents, catalysts & solvents 2

HCID 6344DichloromethaneSolventHCID 8028TetrahydrofuranSolvent

Conditions

Temperature
150 °C

Procedure

To a stirred solution of 6,7-dimethoxy-1-propylisoquinolin-3-ol RBO 35134 (149 mg, 0.60 mmol) in THF (10 mL) in a 20 mL microwave vial equipped with a magnetic stirrer was added 3-(chloromethyl)-6-ethoxy-N-ethylquinolin-2-amine hydrochloride SLA 41042 (181 mg, 0.68 mmol) at RT followed by a 2 N aq. LiOH solution (0.60 mL, 1.20 mmol) and the mixture was stirred at 150° C. for 1.5 h under microwave irradiation. After cooling to RT, the mixture was diluted with CH2Cl2:MeOH=9:1 (150 mL) and 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 95:5) followed by a second purification by column chromatography (SiO2, eluent CH2Cl2:MeOH=100:0 to 97:3) provided 35 mg of 4-((6-ethoxy-2-(ethylamino)quinolin-3-yl)methyl)-6,7-dimethoxy-1-propylisoquinolin-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 (1.0 mL). The reaction mixture was stirred for 5 min at RT then concentrated at 40° C. under vacuum to afford 4-((6-ethoxy-2-(ethylamino)quinolin-3-yl)methyl)-6,7-dimethoxy-1-propylisoquinolin-3-ol dihydrochloride 49 as a yellow solid (14 mg, 4% yield).

Workup

  1. temperatureAfter cooling to RT
  2. washMeOH=9:1 (150 mL) and 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 95:5)
  7. customfollowed by a second purification by column chromatography (SiO2, eluent CH2Cl2:MeOH=100:0 to 97:3)

Sources & evidence

ORD record
ord-21f900badacb45a38cf8807193fd692f
Source dataset
uspto-grants-2014_07
Patent number
US08772316B2

Reaction notes

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