(Diethylamino)sulfur trifluoride → 4-[[5-(3,5-Dichloro-phenylsulfanyl)-1-isopropyl-3-methyl-1H-pyrazol-4-yl]-fluoro-methyl]-pyridine

HRID 47626Notes

Reaction equation

[Cl:1][C:2]1[CH:3]=[C:4]([S:9][C:10]2[N:14]([CH:15]([CH3:17])[CH3:16])[N:13]=[C:12]([CH3:18])[C:11]=2[CH:19](O)[C:20]2[CH:25]=[CH:24][N:23]=[CH:22][CH:21]=2)[CH:5]=[C:6]([Cl:8])[CH:7]=1.C(N(S(F)(F)[F:33])CC)C>ClCCl>[Cl:1][C:2]1[CH:3]=[C:4]([S:9][C:10]2[N:14]([CH:15]([CH3:17])[CH3:16])[N:13]=[C:12]([CH3:18])[C:11]=2[CH:19]([F:33])[C:20]2[CH:25]=[CH:24][N:23]=[CH:22][CH:21]=2)[CH:5]=[C:6]([Cl:8])[CH:7]=1

Participants

Conditions

Temperature: -78 °C

Procedure

To a −78° C. solution of 200 mg of 4-[[5-(3,5-dichloro-phenylsulfanyl)-1-isopropyl-3-methyl-1H-pyrazol-4-yl]-hydroxy-methyl]-pyridine in 5 mL of dichloromethane was added 68 μL of diethylamino sulfur trifluoride. The reaction mixture was stirred for 1 hour at −78° C. then quenched with saturated aqueous sodium hydrogen carbonate. The aqueous phase was extracted three times with 10 mL of dichloromethane and combined extracts were washed with brine, dried, filtered and evaporated to give a blue gum which was purified by flash chromatography on silica gel using diethyl ether/hexane (1:2 then 1:1) for the elution to give 118 mg of 4-[[5-(3,5-Dichloro-phenylsulfanyl)-1-isopropyl-3-methyl-1H-pyrazol-4-yl]-fluoro-methyl]-pyridine as a colourless oil. Mass spectrum (ES) m/z 410 [M+H]+, 451 [M+H+MeCN]+.

Workup

customthen quenched with saturated aqueous sodium hydrogen carbonate
extractionThe aqueous phase was extracted three times with 10 mL of dichloromethane
washwere washed with brine
customdried
filtrationfiltered
customevaporated
customto give a blue gum which
customwas purified by flash chromatography on silica gel
wash1:1) for the elution

Sources & evidence

ORD record: ord-5d554c696590425b9acc71142a721b59
Source dataset: uspto-grants-2004_03
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US06699887B2

Reaction notes

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