Potassium Carbonate → methyl 5-methyl-4-(1-methyl-1H-pyrazol-5-yl)-2-thiophenecarboxylate

HRID 2392155Notes

Reaction equation

Br[C:2]1[CH:3]=[C:4]([C:8]([O:10][CH3:11])=[O:9])[S:5][C:6]=1[CH3:7].[CH3:12][N:13]1[C:17](B2OC(C)(C)C(C)(C)O2)=[CH:16][CH:15]=[N:14]1.C([O-])([O-])=O.[K+].[K+]>O1CCOCC1.O.CC(C)([P](C(C)(C)C)([Pd][P](C(C)(C)C)(C(C)(C)C)C(C)(C)C)C(C)(C)C)C>[CH3:7][C:6]1[S:5][C:4]([C:8]([O:10][CH3:11])=[O:9])=[CH:3][C:2]=1[C:17]1[N:13]([CH3:12])[N:14]=[CH:15][CH:16]=1

Participants

Conditions

Temperature: 85 °C

Procedure

To a 125 mL sealed flask was added methyl 4-bromo-5-methyl-2-thiophenecarboxylate (1.56 g, 6.64 mmol) [Prepared according to the procedure of Preparation 10], 1-methyl-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazole (1.67 g, 8.03 mmol) [prepared according to the procedure of Preparation 7], K2CO3 (2.76 g, 19.97 mmol) and Pd(PtBu3)2 (170 mg, 0.33 mmol) in 1,4-Dioxane (27 ml) and water (7 ml). The reaction mixture was heated to 85° C. in a sealed tube for 3 hours, cooled to room temperature and partitioned between H2O and CHCl3. The organic fraction was dried (Na2SO4), adsorbed onto silica and purified via column chromatography (0-15% EtOAc/Hexane). (385 mg, 1.4 mmol, 30%): LC-MS (ES) m/z=237 (M+H)+.

Workup

customTo a 125 mL sealed flask
customPrepared
customprepared
temperaturecooled to room temperature
custompartitioned between H2O and CHCl3
dry with materialThe organic fraction was dried (Na2SO4)
custompurified via column chromatography (0-15% EtOAc/Hexane)

Sources & evidence

ORD record: ord-81904f0342344fdfa78920973738c4fb
Source dataset: uspto-grants-2012_09
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08273782B2

Reaction notes

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