4-Azidobutyrophenone → 2-(3-Azidopropyl)-5-(2,5-difluorophenyl)-2-phenyl-2,3-dihydro-1,3,4-thiadiazole

HRID 270508Notes

Reaction equation

HRID 270508 reaction equation
[F:1][C:2]1[CH:11]=[CH:10][C:9]([F:12])=[CH:8][C:3]=1[C:4](=[S:7])[NH:5][NH2:6].[N:13]([CH2:16][CH2:17][CH2:18][C:19]([C:21]1[CH:26]=[CH:25][CH:24]=[CH:23][CH:22]=1)=O)=[N+:14]=[N-:15]>CCO.ClCCl.C(O)(=O)C>[N:13]([CH2:16][CH2:17][CH2:18][C:19]1([C:21]2[CH:26]=[CH:25][CH:24]=[CH:23][CH:22]=2)[NH:6][N:5]=[C:4]([C:3]2[CH:8]=[C:9]([F:12])[CH:10]=[CH:11][C:2]=2[F:1])[S:7]1)=[N+:14]=[N-:15]

Participants

5

Reactant 2

HCID 108779184-AzidobutyrophenoneHCID 55279024Benzenecarbothioic acid, 2,5-difluoro-, hydrazide

Product 1

HCID 866048312-(3-Azidopropyl)-5-(2,5-difluorophenyl)-2-phenyl-2,3-dihydro-1,3,4-thiadiazoleYield 54.7%

Reagents, catalysts & solvents 2

HCID 176Acetic AcidCatalystHCID 21584144Dichloromethane ethanolSolvent

Procedure

To a solution of 2,5-difluorobenzothiohydrazide (1.5 g, 7.97 mmol) in EtOH/dichloromethane (3:1, 16 mL) was added 4-azido-1-phenylbutan-1-one (1.36 g, 7.17 mmol). After stirring at room temperature for 16 hours, acetic acid (2 drops) was added and the mixture was stirred for another 16 hours. The reaction mixture was then concentrated under reduced pressure and chromatographed (9:1 hexanes/ethyl acetate) to provide the product (1.41 g, 41%) as a bright yellow syrup.

Workup

  1. stirringthe mixture was stirred for another 16 hours
  2. concentrationThe reaction mixture was then concentrated under reduced pressure
  3. customchromatographed (9:1 hexanes/ethyl acetate)

Sources & evidence

ORD record
ord-439b96e1a6b34328bbae7de376cfb7d2
Source dataset
uspto-grants-2008_11
Patent number
US07449486B2

Reaction notes

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