1-Methyl-5-(tributylstannyl)-1H-pyrazole → HCID 11965460, compound

HRID 1441565Notes

Reaction equation

[CH3:1][O:2][C:3](=[O:16])[C:4]1[CH:9]=[C:8](I)[C:7]([C:11]([F:14])([F:13])[F:12])=[CH:6][C:5]=1[NH2:15].[CH3:17][N:18]1[C:22]([Sn](CCCC)(CCCC)CCCC)=[CH:21][CH:20]=[N:19]1>C1(C=CC=CC=1)[P](C1C=CC=CC=1)(C1C=CC=CC=1)[Pd][P](C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1.O1CCOCC1>[CH3:1][O:2][C:3](=[O:16])[C:4]1[CH:9]=[C:8]([C:22]2[N:18]([CH3:17])[N:19]=[CH:20][CH:21]=2)[C:7]([C:11]([F:14])([F:13])[F:12])=[CH:6][C:5]=1[NH2:15]

Participants

Conditions

Temperature: 100 °C

Procedure

2-Amino-5-iodo-4-trifluoromethyl-benzoic acid methyl ester (7 g, 20.29 mmol) and 1-methyl-5-tributylstannanyl-1H-pyrazole (9.03 g, 1.2 equiv) were weighed in air and added in a flame-dried flask. Bis(triphenylphosphine)palladium (II) dichloride (2.18 g, 0.15 equiv) and dioxane (100 mL) were added and the mixture was stirred for 18 h at 100° C. The mixture was evaporated to dryness. The crude product was purified by flash chromatography (hexanes to EtOAc/hexanes (4:6)) to provide 2-amino-4-trifluoromethyl-5-(2-methyl-2H-pyrazol-3-yl)-benzoic acid methyl ester (4.6 g, 76%) as an orange solid. (ESI-MS: m/z 300.3 [M+H]+, rt 5.15 min).

Workup

additionadded in a flame-dried flask
customThe mixture was evaporated to dryness
customThe crude product was purified by flash chromatography (hexanes to EtOAc/hexanes (4:6))

Sources & evidence

ORD record: ord-01872d0a02414f998315ee1229d67eb4
Source dataset: uspto-grants-2010_02
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07655666B2

Reaction notes

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