1-Hydroxybenzotriazole → 5-(4-tert-butoxycarbonyl-[1,4]diazepane-1-carbonyl)-1H-indole-2-carboxylic acid ethyl ester

HRID 1992494Notes

Reaction equation

HRID 1992494 reaction equation
[CH3:1][CH2:2][O:3][C:4]([C:6]1[NH:7][C:8]2[C:13]([CH:14]=1)=[CH:12][C:11]([C:15]([OH:17])=O)=[CH:10][CH:9]=2)=[O:5].[N:18]1([C:25]([O:27][C:28]([CH3:31])([CH3:30])[CH3:29])=[O:26])[CH2:24][CH2:23][CH2:22][NH:21][CH2:20][CH2:19]1.ON1C2C=CC=CC=2N=N1.Cl.CN(C)CCCN=C=NCC>CN(C=O)C>[CH2:2]([O:3][C:4]([C:6]1[NH:7][C:8]2[C:13]([CH:14]=1)=[CH:12][C:11]([C:15]([N:21]1[CH2:22][CH2:23][CH2:24][N:18]([C:25]([O:27][C:28]([CH3:31])([CH3:30])[CH3:29])=[O:26])[CH2:19][CH2:20]1)=[O:17])=[CH:10][CH:9]=2)=[O:5])[CH3:1]

Participants

6

Reactant 4

HCID 757711-HydroxybenzotriazoleHCID 27239391,3-Propanediamine, N'-(ethylcarbonimidoyl)-N,N-dimethyl-, monohydrochlorideHCID 2756058Tert-butyl 1,4-diazepane-1-carboxylateHCID 180713652-(Ethoxycarbonyl)-1H-indole-5-carboxylic acid

Product 1

HCID 685368405-(4-tert-butoxycarbonyl-[1,4]diazepane-1-carbonyl)-1H-indole-2-carboxylic acid ethyl esterYield 96.5%

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Procedure

To a solution of 1H-indole-2,5-dicarboxylic acid 2-ethyl ester (3.08 g, 13 mmol) and tert-butyl 1-homopiperazine-carboxylate (1 eq., 2.657 g) in DMF (50 ml) was added N-hydroxybenzotriazole (0.2 eq., 360 mg). After a five minutes, N-(3-dimethylaminopropyl)-N′-ethyl-carbodiimide hydrochloride (1.2 eq., 3.05 g) was added and the mixture stirred at room temperature overnight. The solvent was removed under reduced pressure and the crude product was purified by column chromatography on silica gel (3:1 heptane/ethyl acetate eluant) to afford the product as a light-brown solid (5.21 g, 94%). MS (m/z): 416.4 (M+H)+.

Workup

  1. customThe solvent was removed under reduced pressure
  2. customthe crude product was purified by column chromatography on silica gel (3:1 heptane/ethyl acetate eluant)

Sources & evidence

ORD record
ord-a88c7cae3c934578a3bb0af1ddd7fc65
Source dataset
uspto-grants-2010_01
Patent number
US07648979B2

Reaction notes

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