Allyl bromide → 2-Propenyl 4-(phenylamino)-1-(2-phenylethyl)-4-piperidinecarboxylate

HRID 1448286Notes

Reaction equation

HRID 1448286 reaction equation
[C:1]1([NH:7][C:8]2([C:22]([OH:24])=[O:23])[CH2:13][CH2:12][N:11]([CH2:14][CH2:15][C:16]3[CH:21]=[CH:20][CH:19]=[CH:18][CH:17]=3)[CH2:10][CH2:9]2)[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1.[Na].CN(C)P(=O)(N(C)C)N(C)C.Br[CH2:38][CH:39]=[CH2:40]>O>[C:1]1([NH:7][C:8]2([C:22]([O:24][CH2:40][CH:39]=[CH2:38])=[O:23])[CH2:9][CH2:10][N:11]([CH2:14][CH2:15][C:16]3[CH:17]=[CH:18][CH:19]=[CH:20][CH:21]=3)[CH2:12][CH2:13]2)[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1

Participants

6

Reactant 4

HCID 7841Allyl bromideHCID 12679HexamethylphosphoramideHCID 6162334-Piperidinecarboxylic acid, 4-(phenylamino)-1-(2-phenylethyl)-HCID 5360545Sodium

Product 1

HCID 122981482-Propenyl 4-(phenylamino)-1-(2-phenylethyl)-4-piperidinecarboxylate

Reagents, catalysts & solvents 1

HCID 962WaterSolvent

Conditions

Temperature
110 °C

Procedure

A mixture of 10.4 parts of 4-(phenylamino)-1-(2-phenylethyl)-4-piperidinecarboxylic acid, sodium salt and 75 parts of hexamethylphosphoric triamide is stirred and heated to 110° C. for a while. After cooling to 20° C., 3.63 parts of 3-bromo-1-propene are added dropwise. Upon completion, stirring is continued for 20 hours at room temperature. The reaction mixture is poured onto 150 parts of water and the product is extracted with methylbenzene. The extract is washed with water, dried, filtered and evaporated. The oily residue is purified by column-chromatography over silicagel using a mixture of trichloromethane and 5% of methanol as eluent. The pure fractions are collected and the eluent is evaporated. The oily residue is crystallized from hexane, yielding 2-propenyl 4-(phenylamino)-1-(2-phenylethyl)-4-piperidinecarboxylate; mp. 57.2° C.

Workup

  1. temperatureAfter cooling to 20° C.
  2. stirringUpon completion, stirring
  3. extractionthe product is extracted with methylbenzene
  4. washThe extract is washed with water
  5. customdried
  6. filtrationfiltered
  7. customevaporated
  8. customThe oily residue is purified by column-chromatography over silicagel
  9. additiona mixture of trichloromethane and 5% of methanol as eluent
  10. customThe pure fractions are collected
  11. customthe eluent is evaporated
  12. customThe oily residue is crystallized from hexane

Sources & evidence

ORD record
ord-8111682a5b164808bd523cf96d3e5d7d
Source dataset
uspto-grants-1979_12
Patent number
US04179569

Reaction notes

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