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1-Ethyl-3-(3'-dimethylaminopropyl)carbodiimide → (3-Chloro-2-cyclopropylamino-4,5-difluorobenzoyl)-hydrazinecarboxylic acid tert-butyl ester

HRID 10305
Notes
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Reaction equation

HRID 10305 reaction equation
[Cl:1][C:2]1[C:3]([NH:13][CH:14]2[CH2:16][CH2:15]2)=[C:4]([CH:8]=[C:9]([F:12])[C:10]=1[F:11])[C:5]([OH:7])=O.[C:17]([O:21][C:22]([CH3:25])([CH3:24])[CH3:23])(=[O:20])[NH:18][NH2:19].C(N=C=NCCCN(C)C)C>ClCCl>[C:22]([O:21][C:17]([N:18]([C:5](=[O:7])[C:4]1[CH:8]=[C:9]([F:12])[C:10]([F:11])=[C:2]([Cl:1])[C:3]=1[NH:13][CH:14]1[CH2:16][CH2:15]1)[NH2:19])=[O:20])([CH3:25])([CH3:24])[CH3:23]
ParticipantsProcedureWorkupSources & evidenceReaction notes

Participants

5

Reactant 3

HCID 159081-Ethyl-3-(3'-dimethylaminopropyl)carbodiimideHCID 70091tert-Butyl carbazateHCID 219789333-Chloro-2-cyclopropylamino-4,5-difluorobenzoic acid

Product 1

HCID 86591203(3-Chloro-2-cyclopropylamino-4,5-difluorobenzoyl)-hydrazinecarboxylic acid tert-butyl esterYield 63.1%

Reagents, catalysts & solvents 1

HCID 6344
Dichloromethane
Solvent
2×

Procedure

To a solution of 3-chloro-2-cyclopropylamino-4,5-difluorobenzoic acid (Example 5d, 2.09 g, 8.45 mmol) in dichloromethane (30 mL) is added tert-butyl carbazate (1.67 g, 12.7 mmol) and 1-ethyl-3-(3-dimethylaminopropyl)-carbodiimide (2.43 g, 12.7 mmol). After 16 hours, the reaction mixture is diluted with dichloromethane and washed with saturated NaHCO3, water, and brine. The organic layer is dried over MgSO4 and filtered. The filtrate is concentrated under vacuum and purified via flash column chromatography (1:2 ethyl acetate/hexanes) to afford the title compound (1.93 g). MS EI: m/z 360 (M+).

Workup

  1. washwashed with saturated NaHCO3, water, and brine
  2. dry with materialThe organic layer is dried over MgSO4
  3. filtrationfiltered
  4. concentrationThe filtrate is concentrated under vacuum
  5. custompurified via flash column chromatography (1:2 ethyl acetate/hexanes)

Sources & evidence

ORD record
ord-2215a032e5f9454f83cc5b8245d8b56f
Source dataset
uspto-grants-2006_08
DOI
10.6084/m9.figshare.5104873.v1
Patent number
US07094780B1

Reaction notes

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On this pageParticipantsProcedureWorkupSources & evidenceReaction notes