Triethylamine → Methyl 1-(3-chloropyridin-2-yl)-3-{[(methylsulfonyl)oxy]methyl}-1H-pyrazole-5-carboxylate

HRID 1842541Notes

Reaction equation

[Cl:1][C:2]1[C:3]([N:8]2[C:12]([C:13]([O:15][CH3:16])=[O:14])=[CH:11][C:10]([CH2:17][OH:18])=[N:9]2)=[N:4][CH:5]=[CH:6][CH:7]=1.C(N(CC)CC)C.[CH3:26][S:27](Cl)(=[O:29])=[O:28]>ClCCl>[Cl:1][C:2]1[C:3]([N:8]2[C:12]([C:13]([O:15][CH3:16])=[O:14])=[CH:11][C:10]([CH2:17][O:18][S:27]([CH3:26])(=[O:29])=[O:28])=[N:9]2)=[N:4][CH:5]=[CH:6][CH:7]=1

Participants

Conditions

Temperature: 0 °C

Procedure

Under argon 2.10 g (7.85 mmol) of methyl 2-(3-chloropyridin-2-yl)-5-hydroxymethyl-2H-pyrazole-3-carboxylate are introduced in 13 ml of dichloromethane and this initial charge is cooled to 0° C. and admixed dropwise in succession with 1.64 ml (11.8 mmol) of triethylamine and 0.67 ml (8.63 mmol) of methanesulphonyl chloride. It is stirred at this temperature for 30 minutes, diluted with 50 ml of dichloromethane and washed successively with 50 ml each of saturated aqueous sodium hydrogen sulphate solution, 10 percent strength aqueous hydrochloric acid and saturated aqueous sodium chloride solution. The organic phase is dried over magnesium sulphate and then the solvent is removed on a rotary evaporator.

Workup

additionthis initial charge
washwashed successively with 50 ml each of saturated aqueous sodium hydrogen sulphate solution, 10 percent strength aqueous hydrochloric acid and saturated aqueous sodium chloride solution
dry with materialThe organic phase is dried over magnesium sulphate
customthe solvent is removed on a rotary evaporator

Sources & evidence

ORD record: ord-d91bae6a211e407ab72d1c6b326fbe06
Source dataset: uspto-grants-2015_02
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08946236B2

Reaction notes

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