Triethylamine → (S)-1-(3,5-Dichloropyridin-4-yl)ethyl methanesulfonate

Reaction equation

[Cl:1][C:2]1[CH:3]=[N:4][CH:5]=[C:6]([Cl:11])[C:7]=1[C@@H:8]([OH:10])[CH3:9].C(N(CC)CC)C.[CH3:19][S:20](Cl)(=[O:22])=[O:21]>ClCCl>[CH3:19][S:20]([O:10][C@H:8]([C:7]1[C:2]([Cl:1])=[CH:3][N:4]=[CH:5][C:6]=1[Cl:11])[CH3:9])(=[O:22])=[O:21]

Participants

Procedure

Dissolve (S)-1-(3,5-dichloropyridin-4-yl)ethanol (5.02 g, 26.14 mmol) in dichloromethane (DCM, 100 mL) and cool the flask in an ice bath. Add triethylamine (TEA, 3.5 mL, 25.11 mmol) followed by the dropwise addition of methanesulfonyl chloride (2.2 mL, 28.42 mmol). Remove the ice bath and allow the reaction to warm to RT. After 4 hours, quench the reaction with water (100 mL) and separate layers. Extract the aqueous layer with DCM (50 mL) followed by 20% isopropyl alcohol (IPA)/chloroform (50 mL). Combine the organic extracts, dry over anhydrous sodium sulfate, filter and concentrate in vacuo. Yield: 7.15 g, (100%). MS (ES) m/z 270 [M+1]+.