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Chemical Structure| 929899-47-8 Chemical Structure| 929899-47-8

Structure of 929899-47-8

Chemical Structure| 929899-47-8

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Product Details of [ 929899-47-8 ]

CAS No. :929899-47-8
Formula : C7H7F3N2O5S
M.W : 288.20
SMILES Code : O=C(C1=CC(OS(=O)(C(F)(F)F)=O)=NN1C)OC

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Application In Synthesis of [ 929899-47-8 ]

* All experimental methods are cited from the reference, please refer to the original source for details. We do not guarantee the accuracy of the content in the reference.

  • Downstream synthetic route of [ 929899-47-8 ]

[ 929899-47-8 ] Synthesis Path-Downstream   1~1

  • 1
  • [ 358-23-6 ]
  • [ 52867-42-2 ]
  • [ 929899-47-8 ]
YieldReaction ConditionsOperation in experiment
93% With pyridine; In dichloromethane; at 0 - 20℃; for 2h; To a stirred solution of methyl 5-hydroxy-2-methyl-pyrazole-3-carboxylate (0.3 g, 1.92mmol) in DCM (30 mL) at 0 C, Pyridine (0.18 g, 2.30 mmol) followed by Tf20 (0.59 g, 2.11mmol) was added dropwise. The reaction mixture was slowly warmed toRT and stirred for 2h (TLC indicated complete consumption of starting material). The reaction mixture wasslowly diluted with water (15 mL) and extracted with DCM (2 x 30 mL). The combinedorganic extracts were washed with brine (25 mL), dried over Na2S04 and concentrated underreduced pressure to afford methyl 2-methyl-5-(trifluoromethylsulfonyloxy)pyrazole-3-carboxylate (580 mg, 93% ), which was carried to the next step without further purification.LCMS: m/z: 289.4 [M+Ht.
86.1% With triethylamine; In dichloromethane; at -5 - 20℃; for 1h; Methyl 3-hydroxy-1-methyl-1H-pyrazole-5-carboxylate (3.65 g, 23.4 mmol) was dissolved in CH2Cl2 (70 mL) and the reaction was cooled to -5 C. TEA (6.52 mL, 46.8 mmol) and trifluoromethanesulfonic anhydride (7.87 mL, 46.8 mmol) were added to the mixture, and the mixture was stirred at rt for 1 h. The mixture was then poured into 60 mL H2O, the organic layer was separated, and the aqueous layer was extracted with CH2Cl2 (2*100 mL). The combined extracts were washed with water. The combined organic layers were dried (MgSO4), filtered, and the filtrate concentrated to a brown oil. The brown oil was purified by column chromatography over silica gel (petroleum ether/ethyl acetate=10: 1 to petroleum ether/ethyl acetate=1:1). The desired fractions were collected and the solvent was concentrated under reduced pressure to give the product as a yellow oil (6 g, 86.1% yield). LC-MS: (ES, m/z): [M+1]+ 288.9
 

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