Lawesson's reagent → Methyl 5-(6-chloro-4-(isopropylamino)pyridin-3-yl)-1,3,4-thiadiazole-2-carboxylate

HRID 877534

Reaction equation

HRID 877534 reaction equation
[Cl:1][C:2]1[CH:17]=[C:16]([NH:18][CH:19]([CH3:21])[CH3:20])[C:5]([C:6]([NH:8][NH:9][C:10](=O)[C:11]([O:13][CH3:14])=[O:12])=O)=[CH:4][N:3]=1.COC1C=CC(P2(SP(C3C=CC(OC)=CC=3)(=S)S2)=[S:31])=CC=1>C1COCC1.CCOC(C)=O>[Cl:1][C:2]1[N:3]=[CH:4][C:5]([C:6]2[S:31][C:10]([C:11]([O:13][CH3:14])=[O:12])=[N:9][N:8]=2)=[C:16]([NH:18][CH:19]([CH3:21])[CH3:20])[CH:17]=1

Participants

5

Reactant 2

HCID 87949Lawesson's reagentHCID 89689816Methyl 2-(2-(6-chloro-4-(isopropylamino)nicotinoyl)hydrazinyl)-2-oxoacetate

Product 1

HCID 89690804Methyl 5-(6-chloro-4-(isopropylamino)pyridin-3-yl)-1,3,4-thiadiazole-2-carboxylate

Reagents, catalysts & solvents 2

HCID 8028TetrahydrofuranSolventHCID 8857Ethyl AcetateSolvent

Procedure

To a stirred solution of methyl 2-(2-(6-chloro-4-(isopropylamino)nicotinoyl)hydrazinyl)-2-oxoacetate (11) (1 g, 3.1 mmol) in THF (30 mL), Lawesson's reagent (6.3 mmol, 2 equiv) was added and heated to reflux for 3 h. The reaction mixture was diluted with EtOAc and washed twice with 10% NaHCO3 solution. The organic layer was collected, dried over Na2SO4, filtered and concentrated. The crude material obtained was purified by column chromatography through silica gel and MeOH: DCM as eluent afford methyl 5-(6-chloro-4-(isopropylamino)pyridin-3-yl)-1,3,4-thiadiazole-2-carboxylate.

Workup

  1. temperatureheated
  2. temperatureto reflux for 3 h
  3. washwashed twice with 10% NaHCO3 solution
  4. customThe organic layer was collected
  5. dry with materialdried over Na2SO4
  6. filtrationfiltered
  7. concentrationconcentrated
  8. customThe crude material obtained
  9. customwas purified by column chromatography through silica gel and MeOH

Sources & evidence

ORD record
ord-ec41040c1a5d4a7eba64cdd2f636be49
Source dataset
uspto-grants-2015_03
Patent number
US08987311B2

Linked notes

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