Phosphorus pentachloride → 2-(4-Methyl-1-piperazinyl)-5-methylbenzoxazole

HRID 378872Notes

Reaction equation

HRID 378872 reaction equation
P(Cl)(Cl)(Cl)(Cl)Cl.S[C:8]1[O:9][C:10]2[CH:16]=[CH:15][C:14]([CH3:17])=[CH:13][C:11]=2[N:12]=1.[CH3:18][N:19]1[CH2:24][CH2:23][NH:22][CH2:21][CH2:20]1>C1(C)C=CC=CC=1>[CH3:18][N:19]1[CH2:24][CH2:23][N:22]([C:8]2[O:9][C:10]3[CH:16]=[CH:15][C:14]([CH3:17])=[CH:13][C:11]=3[N:12]=2)[CH2:21][CH2:20]1

Participants

5

Reactant 3

HCID 24819Phosphorus pentachlorideHCID 531671-MethylpiperazineHCID 178423563HCID 178423563, compound

Product 1

HCID 105374982-(4-Methyl-1-piperazinyl)-5-methylbenzoxazole

Reagents, catalysts & solvents 1

HCID 1140TolueneSolvent

Conditions

Temperature
100 °C

Procedure

Phosphorus pentachloride (227 mg) was dissolved in anhydrous toluene (3 ml), the resulting solution was mixed with 2-mercapto-5-methylbenzoxazole (150 mg) which has been obtained in the same manner as described in Reference Example 1, and the mixture was then stirred with heating at 100° C. for 2 hours. With cooling in an ice bath, to this was added dropwise N-methylpiperazine (1 ml). After 20 minutes of stirring, the thus obtained mixture was extracted with ethyl acetate, and the organic layer was washed with saturated sodium bicarbonate aqueous solution and saturated brine in that order. After drying with magnesium sulfate, the solvent was evaporated under a reduced pressure, and the resulting residue was purified by a silica gel column chromatography (methylene chloride:methanol=10:1) to obtain the title compound 2-(4-methyl-1-piperazinyl)-5-methylbenzoxazole (188 mg).

Workup

  1. customhas been obtained in the same manner
  2. temperatureWith cooling in an ice bath
  3. stirringAfter 20 minutes of stirring
  4. extractionthe thus obtained mixture was extracted with ethyl acetate
  5. washthe organic layer was washed with saturated sodium bicarbonate aqueous solution and saturated brine in that order
  6. dry with materialAfter drying with magnesium sulfate
  7. customthe solvent was evaporated under a reduced pressure
  8. customthe resulting residue was purified by a silica gel column chromatography (methylene chloride:methanol=10:1)

Sources & evidence

ORD record
ord-e19fbadeb4764348889dd1d2793a2e63
Source dataset
uspto-grants-2001_10
Patent number
US06297246B1

Reaction notes

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