HCID 19911536, compound → HCID 19911541, compound

HRID 1533972Notes

Reaction equation

HRID 1533972 reaction equation
[CH3:1][N:2]1[CH2:7][CH2:6][N:5]([CH2:8][C:9]2[N:17]([CH2:18][CH2:19][O:20]CC3C=CC=CC=3)[C:12]3=[N:13][CH:14]=[CH:15][CH:16]=[C:11]3[N:10]=2)[CH2:4][CH2:3]1.[H][H]>[Pd].CO>[CH3:1][N:2]1[CH2:7][CH2:6][N:5]([CH2:8][C:9]2[N:17]([CH2:18][CH2:19][OH:20])[C:12]3=[N:13][CH:14]=[CH:15][CH:16]=[C:11]3[N:10]=2)[CH2:4][CH2:3]1

Participants

5

Reactant 2

HCID 19911536HCID 19911536, compoundHCID 178418361HCID 178418361, compound

Product 1

HCID 19911541HCID 19911541, compoundYield 46.1%

Reagents, catalysts & solvents 2

HCID 23938PalladiumCatalystHCID 887MethanolSolvent

Procedure

A mixture of 16.7 parts of 2-[(4-methyl-1-piperazinyl)methyl]-3-[2-(phenylmethoxy)ethyl]-3H-imidazo[4,5-b]pyridine and 200 parts of methanol was hydrogenated at normal pressure and at room temperature with 3 parts of palladium-on-charcoal catalyst 10%. After the calculated amount of hydrogen was taken up, the catalyst was filtered off and the filtrate was evaporated. The residue was purified by column chromatography over silica gel using a mixture of trichloromethane and methanol, saturated with ammonia, (95:5 by volume) as eluent. The pure fractions were collected and the eluent was evaporated. The residue was crystallized from 2,2'-oxybispropane. The product was filtered off and dried, yielding 5.84 parts (46.1%) of 2-[(4-methyl-1-piperazinyl)methyl]-3H-imidazo[4,5-b]pyridine-3-ethanol; mp. 89.5° C. (compound 129).

Workup

  1. filtrationthe catalyst was filtered off
  2. customthe filtrate was evaporated
  3. customThe residue was purified by column chromatography over silica gel using
  4. additiona mixture of trichloromethane and methanol
  5. customThe pure fractions were collected
  6. customthe eluent was evaporated
  7. customThe residue was crystallized from 2,2'-oxybispropane
  8. filtrationThe product was filtered off
  9. customdried

Sources & evidence

ORD record
ord-64c1ec5424d64996812c964e23e5ecde
Source dataset
uspto-grants-1992_02
Patent number
US05086056

Reaction notes

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