Potassium Carbonate → Methyl 5-chloro-4-(1-methyl-1H-pyrazol-5-yl)thiophene-2-carboxylate

HRID 1961004Notes

Reaction equation

HRID 1961004 reaction equation
[Cl:1][C:2]1[S:6][C:5]([C:7]([O:9][CH3:10])=[O:8])=[CH:4][C:3]=1I.C([O-])([O-])=O.[K+].[K+].CC1(C)COB([C:25]2[N:29]([CH3:30])[N:28]=[CH:27][CH:26]=2)OC1>O1CCOCC1.O.C1C=CC([P]([Pd]([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)[P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1>[Cl:1][C:2]1[S:6][C:5]([C:7]([O:9][CH3:10])=[O:8])=[CH:4][C:3]=1[C:25]1[N:29]([CH3:30])[N:28]=[CH:27][CH:26]=1

Participants

6

Reactant 3

HCID 11430Potassium CarbonateHCID 441194445-(5,5-Dimethyl-1,3,2-dioxaborinan-2-YL)-1-methyl-1H-pyrazoleHCID 57826418Methyl 5-chloro-4-iodo-2-thiophenecarboxylate

Product 1

HCID 57826577Methyl 5-chloro-4-(1-methyl-1H-pyrazol-5-yl)thiophene-2-carboxylateYield 24%

Reagents, catalysts & solvents 2

HCID 178418397HCID 178418397, compoundCatalystHCID 218864351,4-Dioxane--water (1/1)Solvent

Conditions

Temperature
80 °C

Procedure

To a solution of methyl 5-chloro-4-iodo-2-thiophenecarboxylate (1.75 g, 5.8 mmol) in dioxane/H2O (50:5 mL) was added K2CO3 (3.4 g, 24.9 mmol), tetrakistriphenylphosphine Pd(0) (0.96 g, 0.83 mmol), and 5-(5,5-dimethyl-1,3,2-dioxaborinane-2-yl)-1-methyl-1H-pyrazole (3.4 g, 16.5 mmol). The reaction mixture was heated to 80° C. in a sealed tube for 15 h. The reaction solution was concentrated under vacuum and purified on silica gel (hexanes/EtOAc, 4:1) to give the title compound (0.35 g, 24%) as a yellow oil: LC-MS (ES) m/z=257 (M+H)+.

Workup

  1. concentrationThe reaction solution was concentrated under vacuum
  2. custompurified on silica gel (hexanes/EtOAc, 4:1)

Sources & evidence

ORD record
ord-0aad838acf784ea9b814ff4fb8d8c638
Source dataset
uspto-grants-2013_04
Patent number
US08410158B2

Reaction notes

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