Maleic Acid → HCID 178505429, compound

HRID 741995Notes

Reaction equation

HRID 741995 reaction equation
Cl.[F:2][C:3]1[CH:11]=[C:10]2[C:6]([C:7]([CH:12]3[CH2:17][CH2:16][N:15]([CH2:18][CH2:19][N:20]4[C:24](=O)[C:23]5=[CH:26][CH:27]=[CH:28][CH:29]=[C:22]5[C:21]4=O)[CH2:14][CH2:13]3)=[N:8][NH:9]2)=[CH:5][CH:4]=1.[H-].[Al+3].[Li+].[H-].[H-].[H-].[C:37]([OH:44])(=[O:43])/[CH:38]=[CH:39]\[C:40]([OH:42])=[O:41]>C1COCC1.CO>[C:37]([OH:44])(=[O:43])/[CH:38]=[CH:39]\[C:40]([OH:42])=[O:41].[C:37]([OH:44])(=[O:43])/[CH:38]=[CH:39]\[C:40]([OH:42])=[O:41].[F:2][C:3]1[CH:11]=[C:10]2[C:6]([C:7]([CH:12]3[CH2:17][CH2:16][N:15]([CH2:18][CH2:19][N:20]4[CH2:24][C:23]5[C:22](=[CH:29][CH:28]=[CH:27][CH:26]=5)[CH2:21]4)[CH2:14][CH2:13]3)=[N:8][NH:9]2)=[CH:5][CH:4]=1

Participants

6

Reactant 3

HCID 444266Maleic AcidHCID 21226445Aluminium lithium hydrideHCID 178479599HCID 178479599, compound

Product 1

HCID 178505429HCID 178505429, compound

Reagents, catalysts & solvents 2

HCID 887MethanolSolventHCID 8028TetrahydrofuranSolvent2×

Procedure

To a solution of N-[2-[4-(6-fluoro-1H-indazol-3-yl)-1-piperidinyl]ethyl]phthalimide hydrochloride (Example 183) (3.1 g, 7.91 mmol) in THF (100 ml) was added lithium aluminum hydride (16.6 ml of a 1.0M solution in THF, 16.6 mmol) at room temperature, under nitrogen. The reaction mixture was warmed to reflux for 6.5 hours and cooled to room temperature. The reaction was quenched with water (1.5 ml, dropwise) and the precipitated salts were removed via filtration. The solids were washed with DCM and the combined filtrates concentrated to give 2.5 g of the crude product as a solid. The dimaleate salt was prepared in methanol using 3.5 g (>4.0 e.q.) of maleic acid. The light green precipitate was collected via filtration and washed with methanol. Recrystallization from methanol gave 2.1 g of the desired product as an off-white solid, m.p. 196°-199° C.

Workup

  1. temperatureThe reaction mixture was warmed
  2. temperatureto reflux for 6.5 hours
  3. customThe reaction was quenched with water (1.5 ml
  4. customdropwise) and the precipitated salts were removed via filtration
  5. washThe solids were washed with DCM
  6. concentrationthe combined filtrates concentrated
  7. customto give 2.5 g of the crude product as a solid
  8. filtrationThe light green precipitate was collected via filtration
  9. washwashed with methanol
  10. customRecrystallization from methanol

Sources & evidence

ORD record
ord-37be85f7eed54b6097fa7f1fa2e71075
Source dataset
uspto-grants-1996_09
Patent number
US05552414

Reaction notes

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