Maleic Acid → HCID 178505429, compound

HRID 2270020Notes

Reaction equation

HRID 2270020 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-7aa42b74a1ff481aa5cc489faa875b53
Source dataset
uspto-grants-2001_12
Patent number
USRE037478E1

Reaction notes

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