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

HRID 2392257Notes

Reaction equation

Br[C:2]1[CH:3]=[C:4]([C:7]([O:9][CH3:10])=[O:8])[S:5][CH:6]=1.[CH2:11]([N:13]1[C:17](B2OC(C)(C)C(C)(C)O2)=[C:16]([CH3:27])[CH:15]=[N:14]1)[CH3:12].C([O-])([O-])=O.[K+].[K+]>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>[CH2:11]([N:13]1[C:17]([C:2]2[CH:3]=[C:4]([C:7]([O:9][CH3:10])=[O:8])[S:5][CH:6]=2)=[C:16]([CH3:27])[CH:15]=[N:14]1)[CH3:12]

Participants

Conditions

Temperature: 70 °C

Procedure

A mixture of methyl 4-bromo-2-thiophenecarboxylate (300 mg, 1.36 mmol), 1-ethyl-4-methyl-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazole (449 mg, 1.9 mmol), Pd(Ph3P)4 (157 mg, 0.136 mmol), and K2CO3 (536 mg, 4.07 mmol) was heated at 70° C. for 2 h, concentrated and purified on silica (EtOAc/Hex, 10-30%) to afford the title compound (0.27 g, 79%) as a syrup: LC-MS m/z=251 (M+H)+.

Workup

concentrationconcentrated
custompurified on silica (EtOAc/Hex, 10-30%)

Sources & evidence

ORD record: ord-24bd8bfa25a341629b6c577d31f152ae
Source dataset: uspto-grants-2012_09
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08273782B2

Reaction notes

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