Aminoethylpiperazine → 1-(2-N-Boc-aminoethyl)piperazine

HRID 260910

Reaction equation

HRID 260910 reaction equation
[NH2:1][CH2:2][CH2:3][N:4]1[CH2:9][CH2:8][NH:7][CH2:6][CH2:5]1.[C:10]([O:14][C:15](ON=C(C1C=CC=CC=1)C#N)=[O:16])([CH3:13])([CH3:12])[CH3:11]>O1CCOCC1.O>[C:10]([O:14][C:15]([NH:1][CH2:2][CH2:3][N:4]1[CH2:9][CH2:8][NH:7][CH2:6][CH2:5]1)=[O:16])([CH3:13])([CH3:12])[CH3:11]

Participants

4

Reactant 2

HCID 8795AminoethylpiperazineHCID 938652-(tert-Butoxycarbonyloxyimino)-2-phenylacetonitrile

Product 1

HCID 15144011-(2-N-Boc-aminoethyl)piperazine

Reagents, catalysts & solvents 1

HCID 218864351,4-Dioxane--water (1/1)Solvent

Procedure

1-(2-aminoethyl)piperazine (1.29 g, 10 mmol) is dissolved in 20 mL of dioxane:water (1:1) mixture and 2-(tert-butoxycarbonyloxyimino)-2-phenylacetonitrile (2.46 g, 10 mmol) is added. The mixture is then stirred until no starting material is detected on thin layer chromatography. The obtained mixture is fractionally separated by silica gel chromatography, followed by RP-HPLC to obtain 1-[2-tert-butoxycarbonylaminoethyl]piperazine. Following the procedure of Example 6, but replacing 1-benzylpiperazine with 1-[2-tert-butoxycarbonylaminoethyl]piperazine, provides the desired compound. The product of Example 3 (2.1 g, 2.03 mmol), 1-[2-tert-butoxycarbonylaminoethyl]piperazine (1.396 g, 6.09 mmol), and triethylamine (0.85 mL, 6.09 mmol) in 10 mL of methylene chloride are used. The obtained product (1.0 g) is treated with 48%-HF (4 mL) in 35 mL of acetonitrile in the procedure described in Example 5, followed by a carefully deprotection of N-tert-butoxycarbonyl group with 10% trifluoroacetic acid to obtain the pure title compound.

Workup

  1. additionis added
  2. customThe obtained mixture is fractionally separated by silica gel chromatography

Sources & evidence

ORD record
ord-d801ae9163a74e1284e45fd1be6ad25e
Source dataset
uspto-grants-1996_06
Patent number
US05530119

Linked notes

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