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

HRID 1845613Notes

Reaction equation

Br[C:2]1[CH:3]=[C:4]([C:9]([O:11][CH3:12])=[O:10])[S:5][C:6]=1[O:7][CH3:8].[CH3:13][N:14]1[C:18](B2OC(C)(C)C(C)(C)O2)=[CH:17][CH:16]=[N:15]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>[CH3:8][O:7][C:6]1[S:5][C:4]([C:9]([O:11][CH3:12])=[O:10])=[CH:3][C:2]=1[C:18]1[N:14]([CH3:13])[N:15]=[CH:16][CH:17]=1

Participants

Conditions

Temperature: 85 °C

Procedure

To a 350 mL sealed flask reactor was added methyl 4-bromo-5-(methyloxy)-2-thiophenecarboxylate (772 mg, 3.07 mmol), 1-methyl-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazole (773 mg, 3.72 mmol) [prepared according to the procedure of Preparation 7], K2CO3 (1.419 g, 10.27 mmol) and Pd(Pt-Bu3)2 (103 mg, 0.20 mmol) in 1,4-Dioxane (12 mL) and Water (3 mL). The reaction was heated at 85° C. for 2 hours. The mixture was partitioned between CHCl3/H2O and the aqueous layer made acidic with 6N HCl. The separated organic layer was dried over Na2SO4 and evaporated. The resulting material was adsorbed onto silica and purified via column chromatography (0-50% EtOAc/Hexane) affording the title compound (967 mg, 4.39 mmol, 85%): LC-MS (ES) m/z=253 (M+H)+.

Workup

customTo a 350 mL sealed flask reactor
customprepared
customThe mixture was partitioned between CHCl3/H2O
dry with materialThe separated organic layer was dried over Na2SO4
customevaporated
custompurified via column chromatography (0-50% EtOAc/Hexane)

Sources & evidence

ORD record: ord-10f9e2b5fdf04e389a66f08d40ba5584
Source dataset: uspto-grants-2015_02
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08946278B2

Reaction notes

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