Hydrochloric Acid → (3R,8S)-3-[4-(3,4-dichloro-benzyloxy)-phenyl]-2,3,8,9-tetrahydro-6H-[1,4]dioxino[2,3-g]isoquinoline-7,8-dicarboxylic acid 7-tert-butyl ester

HRID 391841Notes

Reaction equation

HRID 391841 reaction equation
C[O:2][C:3]([C@@H:5]1[CH2:14][C:13]2[CH:12]=[C:11]3[O:15][CH2:16][C@@H:17]([C:19]4[CH:24]=[CH:23][C:22]([O:25][CH2:26][C:27]5[CH:32]=[CH:31][C:30]([Cl:33])=[C:29]([Cl:34])[CH:28]=5)=[CH:21][CH:20]=4)[O:18][C:10]3=[CH:9][C:8]=2[CH2:7][N:6]1[C:35]([O:37][C:38]([CH3:41])([CH3:40])[CH3:39])=[O:36])=[O:4].[Li+].[OH-].Cl>C1COCC1.CO>[C:38]([O:37][C:35]([N:6]1[C@H:5]([C:3]([OH:4])=[O:2])[CH2:14][C:13]2[CH:12]=[C:11]3[O:15][CH2:16][C@@H:17]([C:19]4[CH:24]=[CH:23][C:22]([O:25][CH2:26][C:27]5[CH:32]=[CH:31][C:30]([Cl:33])=[C:29]([Cl:34])[CH:28]=5)=[CH:21][CH:20]=4)[O:18][C:10]3=[CH:9][C:8]=2[CH2:7]1)=[O:36])([CH3:41])([CH3:39])[CH3:40]

Participants

5

Reactant 3

HCID 313Hydrochloric AcidHCID 3939Lithium HydroxideHCID 58327259(3R,8S)-3-[4-(3,4-Dichloro-benzyloxy)-phenyl]-2,3,8,9-tetrahydro-6H-[1,4]dioxino[2,3-g]isoquinoline-7,8-dicarboxylic acid 7-tert-butyl ester 8-methyl ester

Product 1

HCID 58327389(3R,8S)-3-[4-(3,4-dichloro-benzyloxy)-phenyl]-2,3,8,9-tetrahydro-6H-[1,4]dioxino[2,3-g]isoquinoline-7,8-dicarboxylic acid 7-tert-butyl ester

Reagents, catalysts & solvents 1

HCID 21899815MeOH tetrahydrofuranSolvent

Procedure

(3R,8S)-3-[4-(3,4-Dichloro-benzyloxy)-phenyl]-2,3,8,9-tetrahydro-6H-[1,4]dioxino[2,3-g]isoquinoline-7,8-dicarboxylic acid 7-tert-butyl ester 8-methyl ester (1.0 g) was dissolved in 60 mL of THF-MeOH (1:4) and the mixture cooled on an ice bath. 2 N aqueous LiOH (5 eq.) was added and the mixture was stirred on ice for 15 minutes and then at room temperature for 14 hours. The pH of the mixture was adjusted to about 2 with 1N HCl and extracted with EtOAc. The organic layer was washed with brine, dried over sodium sulfate and concentrated. DCM was added and mixture was again concentrated (900 mg). LCMS: m/z 587.

Workup

  1. temperaturethe mixture cooled on an ice bath
  2. waitat room temperature for 14 hours
  3. extractionextracted with EtOAc
  4. washThe organic layer was washed with brine
  5. dry with materialdried over sodium sulfate
  6. concentrationconcentrated
  7. additionDCM was added
  8. concentrationmixture was again concentrated (900 mg)

Sources & evidence

ORD record
ord-ec7b6f45089c4cf2bbcff191a058a1eb
Source dataset
uspto-grants-2013_02
Patent number
US08383644B2

Reaction notes

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