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Nitrogen → {4-[2-(3,4,5-Trimethoxy-phenyl)-acetyl]-piperazin-1-yl}-acetic acid ethyl ester

HRID 383598
Notes
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Reaction equation

HRID 383598 reaction equation
N#N.CCN(CC)CC.[CH3:10][O:11][C:12]1[CH:13]=[C:14]([CH2:22][C:23]([OH:25])=O)[CH:15]=[C:16]([O:20][CH3:21])[C:17]=1[O:18][CH3:19].[CH2:26]([O:28][C:29]([CH2:31][N:32]1[CH2:37][CH2:36][NH:35][CH2:34][CH2:33]1)=[O:30])[CH3:27]>C(Cl)Cl.CN(C1C=CN=CC=1)C>[CH2:26]([O:28][C:29](=[O:30])[CH2:31][N:32]1[CH2:37][CH2:36][N:35]([C:23](=[O:25])[CH2:22][C:14]2[CH:15]=[C:16]([O:20][CH3:21])[C:17]([O:18][CH3:19])=[C:12]([O:11][CH3:10])[CH:13]=2)[CH2:34][CH2:33]1)[CH3:27]
ParticipantsProcedureWorkupSources & evidenceReaction notes

Participants

7

Reactant 4

HCID 947NitrogenHCID 8471TriethylamineHCID 703723,4,5-Trimethoxyphenylacetic acidHCID 207112Ethyl piperazine-1-acetate

Product 1

HCID 59785709{4-[2-(3,4,5-Trimethoxy-phenyl)-acetyl]-piperazin-1-yl}-acetic acid ethyl esterYield 40%

Reagents, catalysts & solvents 2

HCID 14284
4-(Dimethylamino)pyridine
Catalyst
HCID 6344DichloromethaneSolvent

Procedure

(The following reaction is done in an anhydrous N2 atmosphere.) Suspend EDCHCl (188 mg, 0.98 mmol) and Et3N (137 mL, 0.98 mmol) in anhydrous DCM (1.0 mL) and stir the resulting solution for 5 min at rt. Add 2-(3,4,5-Trimethoxy-phenyl)-acetic acid (163 mg, 0.72 mmol) and DMAP (8 mg, 0.07 mmol) and stir the resulting solution for 10 min. Add 1-(Ethoxycarbonylmethyl)piperazine (63) (112 mg, 0.65 mmol) and stir the reaction solution overnight at rt. Quench reaction solution with sat. aqu. NH4Cl and water, separate layers and extract aqu. layer with DCM (3 times). Wash the combined organic layer with water and brine and dry with Na2SO4. Purify the crude product by preparative radial chromatography (silica gel, EtOAc/MeOH 10+1) to obtain {4-[2-(3,4,5-Trimethoxy-phenyl)-acetyl]-piperazin-1-yl}-acetic acid ethyl ester (64) (99 mg, 40%) as a colorless oil. 1H NMR (400 MHz, CDCl3): 1.25 (t, 3H, J=7.1 Hz); 2.48 (br.m, 2H); 2.58 (br.m, 2H); 3.21 (br.s, 2H); 3.53 (br.m, 2H); 3.65 (s, 2H); 3.71 (br.m, 2H); 3.81 (s, 3H); 3.82 (s, 6 H); 4.16 (q, 2H, J=7.1 Hz); 6.42 (s, 2H).

Workup

  1. custom(The following reaction
  2. customQuench
  3. customreaction solution with sat. aqu
  4. customNH4Cl and water, separate layers
  5. extractionextract aqu
  6. washWash the combined organic layer with water and brine
  7. dry with materialdry with Na2SO4
  8. customPurify the crude product by preparative radial chromatography (silica gel, EtOAc/MeOH 10+1)

Sources & evidence

ORD record
ord-6a0caf20ae5a4e1da336ecd2195689f0
Source dataset
uspto-grants-2013_02
DOI
10.6084/m9.figshare.5104873.v1
Patent number
US08367677B2

Reaction notes

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On this pageParticipantsProcedureWorkupSources & evidenceReaction notes