1-Ethyl-3-(3'-dimethylaminopropyl)carbodiimide → HCID 178473365, compound

HRID 1795235Notes

Reaction equation

HRID 1795235 reaction equation
[C:1]([C:4]1[CH:13]=[C:12]([O:14][CH3:15])[C:11]2[C:6](=[CH:7][CH:8]=[CH:9][CH:10]=2)[N:5]=1)([OH:3])=O.[CH2:16]([O:18][C:19]([N:21]1[CH2:26][CH2:25][N:24]([C:27]([CH:29]([NH2:36])[CH2:30][C:31]2[N:32]=[CH:33][NH:34][CH:35]=2)=[O:28])[CH2:23][CH2:22]1)=[O:20])[CH3:17].CCN=C=NCCCN(C)C.C1C=CC2N(O)N=NC=2C=1>C1COCC1.C(Cl)Cl.CO.C(N(CC)CC)C>[CH2:16]([O:18][C:19]([N:21]1[CH2:26][CH2:25][N:24]([C:27]([CH:29]([NH:36][C:1]([C:4]2[CH:13]=[C:12]([O:14][CH3:15])[C:11]3[C:6](=[CH:7][CH:8]=[CH:9][CH:10]=3)[N:5]=2)=[O:3])[CH2:30][C:31]2[N:32]=[CH:33][NH:34][CH:35]=2)=[O:28])[CH2:23][CH2:22]1)=[O:20])[CH3:17]

Participants

9

Reactant 4

HCID 159081-Ethyl-3-(3'-dimethylaminopropyl)carbodiimideHCID 757711-HydroxybenzotriazoleHCID 5945964-Methoxy-2-quinolinecarboxylic acidHCID 1784734004-Ethoxycarbonyl-1-(1-amino-2-(imidazol-4-yl)ethyl)carbonylpiperazine

Product 1

HCID 178473365HCID 178473365, compound

Reagents, catalysts & solvents 4

HCID 887MethanolSolventHCID 6344DichloromethaneSolvent2×HCID 8028TetrahydrofuranSolvent2×HCID 8471TriethylamineSolvent2×

Procedure

To a solution of N-t-butoxycarbonylhistidine (2 g, 7.05 mmol) in THF (30 mL) was added 1-ethoxycarbonylpiperazine (1.36 mL, 1.3 eq.), EDCI (1.65 g, 1.2 eq. ), HOBt (1.2 g, 1.1 eq.) and the reaction mixture was stirred overnight. The reaction mixture was evaporated in vacuo to afford a crude product, which was dissolved in ethyl acetate, washed with saturated NaHCO3, 1M NaHSO4 and brine. The organic layer was evaporated. Flash column chromatography with 2%–6% MeOH in CH2Cl2 afforded 4-ethoxycarbonyl-1-(1-(t-butoxycarbonyl)amino-2-(imidazol-4-yl)ethyl)carbonylpiperazine (820 mg). 4-Ethoxycarbonyl-1-(1-(t-butoxycarbonyl)amino-2-(imidazol-4-yl)ethyl)carbonylpiperazine (200 mg, 0.5 mmol) was treated with trifluoroacetic acid/methylene chloride (1:1, 2.0 mL) with stirring at ambient temperture for 1 hour. Evaporation gave 4-ethoxycarbonyl-1-(1-amino-2-(imidazol-4-yl)ethyl)carbonylpiperazine, which was treated with methylene chloride and triethylamine (0.5 mL), and the solvents evaporated to again afford 4-ethoxycarbonyl-1-(1-amino-2-(imidazol-4-yl)ethyl)carbonylpiperazine. To a solution of 2-carboxy-4-methoxyquinoline (124 mg, 0.61 mmol) in THF (4 mL) was added a mixture of 4-ethoxycarbonyl-1-(1-amino-2-(imidazol-4-yl)ethyl)carbonylpiperazine, THF (2 mL), and triethylamine (0.1 mL), followed by addition of EDCI (136 mg, 1.4 eq.), HOBt (98 mg, 1.4 eq.). The resulting mixture was stirred overnight. The crude product (245 mg, foam) was isolated from the reaction mixture by the same methods employed above. Flash column chromatography with 25%–6% MeOH in methylene chloride afforded 2-[1-(4-(ethoxycarbonyl)piperazin-1-yl)carbonyl-2-(imidazol-4-yl)ethyl]aminocarbonyl-4-methoxyquinoline; NMR (CDCl3) 1.25 (t, 3), 3.10–3.30 (m, 2), 3.20–3.65 (m, 9), 4.10 (m, 5), 5.40 (m, 1), 6.90 (s, 1), 7.55–7.60 (m, 3), 7.70 (t, 1), 8.02 (d, 1), 8.20 (d, 1), 9.0 (d, 1) ppm.

Workup

  1. customthe solvents evaporated to again afford 4-ethoxycarbonyl-1-(1-amino-2-(imidazol-4-yl)ethyl)carbonylpiperazine
  2. customThe crude product (245 mg, foam) was isolated from the reaction mixture by the same methods

Sources & evidence

ORD record
ord-605d64fc6dee4f638c407fce7a91ed50
Source dataset
uspto-grants-2006_04
Patent number
US07026323B2

Reaction notes

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