Dicyclohexylcarbodiimide → N-(2-bromoisonicotinoyl)-3-(3,4-dimethoxyphenyl)alanine ethyl ester

HRID 1739434Notes

Reaction equation

HRID 1739434 reaction equation
[CH2:1]([O:3][C:4](=[O:18])[C@H:5]([CH2:7][C:8]1[CH:13]=[CH:12][C:11]([O:14][CH3:15])=[C:10]([O:16][CH3:17])[CH:9]=1)[NH2:6])[CH3:2].[Br:19][C:20]1[CH:21]=[C:22]([CH:26]=[CH:27][N:28]=1)[C:23](O)=[O:24].O.ON1C2C=CC=CC=2N=N1.C1(N=C=NC2CCCCC2)CCCCC1>C(Cl)Cl>[CH2:1]([O:3][C:4](=[O:18])[C@H:5]([CH2:7][C:8]1[CH:13]=[CH:12][C:11]([O:14][CH3:15])=[C:10]([O:16][CH3:17])[CH:9]=1)[NH:6][C:23](=[O:24])[C:22]1[CH:26]=[CH:27][N:28]=[C:20]([Br:19])[CH:21]=1)[CH3:2]

Participants

6

Reactant 4

HCID 10868DicyclohexylcarbodiimideHCID 2227012-Bromoisonicotinic acidHCID 27960291-Hydroxybenzotriazole hydrateHCID 10060820ethyl (2S)-2-amino-3-(3,4-dimethoxyphenyl)propanoate

Product 1

HCID 53678990N-(2-bromoisonicotinoyl)-3-(3,4-dimethoxyphenyl)alanine ethyl esterYield 64.9%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

To methylene chloride (120 ml) are added 3-(3,4-dimethoxyphenyl)alanine ethyl ester (12.4 g), 2-bromoisonicotinic acid (10.9 g), 1-hydroxybenzotriazole monohydrate (8.23 g) and 1,3-dicyclohexylcarbodiimide (11.1 g), and the mixture is stirred at room temperature overnight. The insoluble materials are removed by filtration, and the filtrate is concentrated. The residue is purified by silica gel chromatography (solvent; chloroform:acetone=10:1) to give N-(2-bromoisonicotinoyl)-3-(3,4-dimethoxyphenyl)alanine ethyl ester (13.9 g) as an oily product.

Workup

  1. customThe insoluble materials are removed by filtration
  2. concentrationthe filtrate is concentrated
  3. customThe residue is purified by silica gel chromatography (solvent; chloroform:acetone=10:1)

Sources & evidence

ORD record
ord-5fb5678feb824c4c871dd44cada223c3
Source dataset
uspto-grants-1999_10
Patent number
US05965730

Reaction notes

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