Chlorotrimethylsilane → 1-Ethoxycarbonyl-4-trimethylsilylpiperazine

HRID 1462333Notes

Reaction equation

HRID 1462333 reaction equation
[CH2:1]([O:3][C:4]([N:6]1[CH2:11][CH2:10][NH:9][CH2:8][CH2:7]1)=[O:5])[CH3:2].C([Li])CCC.Cl[Si:18]([CH3:21])([CH3:20])[CH3:19]>O1CCCC1.CCCCCC>[CH2:1]([O:3][C:4]([N:6]1[CH2:7][CH2:8][N:9]([Si:18]([CH3:21])([CH3:20])[CH3:19])[CH2:10][CH2:11]1)=[O:5])[CH3:2]

Participants

6

Reactant 3

HCID 6397ChlorotrimethylsilaneHCID 84311-Piperazinecarboxylic acid, ethyl esterHCID 178418339Butyllithium

Product 1

HCID 133449251-Ethoxycarbonyl-4-trimethylsilylpiperazine

Reagents, catalysts & solvents 2

HCID 8028TetrahydrofuranSolvent2×HCID 8058HexaneSolvent

Procedure

A solution of 20 g of 1-ethoxycarbonylpiperazine in 400 ml dry tetrahydrofuran was cooled to -65° and 61.5 ml of 2.1M solution of n-butyllithium in hexane was added dropwise over a period of 15 minutes. The mixture was stirred for 15 minutes and a solution of 16.44 ml of chlorotrimethylsilane in 68 ml of tetrahydrofuran was added dropwise over a period of 15 minutes. The mixture was then allowed to warm up to room temperature overnight and evaporated to dryness. Ethyl ether was added, the solids were filtered off, the filtrate was evaporated to dryness and the residue was distilled to give 1-ethoxycarbonyl-4-trimethylsilylpiperazine, b.p. 102°-107°/0.1 mm/Hg.

Workup

  1. customevaporated to dryness
  2. additionEthyl ether was added
  3. filtrationthe solids were filtered off
  4. customthe filtrate was evaporated to dryness
  5. distillationthe residue was distilled

Sources & evidence

ORD record
ord-73e1452dc0044d969e9017a45800ca8f
Source dataset
uspto-grants-1984_07
Patent number
US04460508

Reaction notes

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