Water → Ethyl 6-(1-benzyloxycarbonyl-4-piperidyl)-2-chlorohexanoate

HRID 980610Notes

Reaction equation

HRID 980610 reaction equation
[CH2:1]([O:8][C:9]([N:11]1[CH2:16][CH2:15][CH:14]([CH2:17][CH2:18][CH2:19][CH2:20][CH:21](O)[C:22]([O:24][CH2:25][CH3:26])=[O:23])[CH2:13][CH2:12]1)=[O:10])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.S(Cl)([Cl:30])=O.O>C(OCC)(=O)C.N1C=CC=CC=1>[CH2:1]([O:8][C:9]([N:11]1[CH2:16][CH2:15][CH:14]([CH2:17][CH2:18][CH2:19][CH2:20][CH:21]([Cl:30])[C:22]([O:24][CH2:25][CH3:26])=[O:23])[CH2:13][CH2:12]1)=[O:10])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1

Participants

6

Reactant 3

HCID 962WaterHCID 24386Thionyl ChlorideHCID 13817553Ethyl 6-(1-benzyloxycarbonyl-4-piperidyl)-2-hydroxyhexanoate

Product 1

HCID 19868892Ethyl 6-(1-benzyloxycarbonyl-4-piperidyl)-2-chlorohexanoate

Reagents, catalysts & solvents 2

HCID 1049PyridineSolventHCID 8857Ethyl AcetateSolvent2×

Procedure

In a mixture of 120 ml of ethyl acetate and 13 g of pyridine is dissolved 12.8 g of ethyl 6-(1-benzyloxycarbonyl -4-piperidyl)-2-hydroxyhexanoate, and 5.1 ml of thionyl chloride is added to the solution, followed by refluxing with stirring for 45 minutes. After cooling, 500 ml of water and 200 ml of ethyl acetate are added to the reaction solution, and extraction is carried out. The extract is washed with 0.1 N hydrochloric acid and water successively, dried over anhydrous magnesium sulfate and concentrated under reduced pressure. The resulting oily material is purified by silica gel column chromatography (hexane:ethyl acetate=4:1) to give 10 g of ethyl 6-(1-benzyloxycarbonyl-4-piperidyl)-2-chlorohexanoate as a colorless oily material.

Workup

  1. additionis added to the solution
  2. temperatureby refluxing
  3. temperatureAfter cooling
  4. washThe extract is washed with 0.1 N hydrochloric acid and water successively
  5. dry with materialdried over anhydrous magnesium sulfate
  6. concentrationconcentrated under reduced pressure
  7. customThe resulting oily material is purified by silica gel column chromatography (hexane:ethyl acetate=4:1)

Sources & evidence

ORD record
ord-d279516795544b5db3040fdb715a6325
Source dataset
uspto-grants-1987_01
Patent number
US04638000

Reaction notes

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