(Diethylamino)sulfur trifluoride → 2-Chloro-4-(1-fluoroethyl)pyrimidine
Reaktionsgleichung
[Cl:1][C:2]1[N:7]=[C:6]([CH:8](O)[CH3:9])[CH:5]=[CH:4][N:3]=1.C(N(S(F)(F)[F:17])CC)C>ClCCl>[Cl:1][C:2]1[N:7]=[C:6]([CH:8]([F:17])[CH3:9])[CH:5]=[CH:4][N:3]=1Komponenten
4
Edukt 2
Produkt 1
Reagenzien, Katalysatoren, Lösungsmittel 1
Versuchsvorschrift
To a solution of 1-(2-chloropyrimidin-4-yl)ethanol (150 mg, 0.950 mmol) in dichloromethane (3 mL) at 0° C. was added diethylaminosulfur trifluoride (183 mg, 1.14 mmol) dropwise and stirred for 3 hr. The solution was diluted with dichloromethane, washed with saturated aqueous NaHCO3, dried with MgSO4, and concentrated to dryness. Purification on silica gel by flash chromatography (0-50% EtOAc/hexanes) afforded 2-chloro-4-(1-fluoroethyl)pyrimidine (75 mg, 0.467 mmol, 49% yield) as a yellow oil. MS ESI: [M+H]+ m/z 161.0. 1H NMR (500 MHz, CDCl3) δ 8.67 (d, J=4.2, 1H), 7.46 (d, J=4.2, 1H), 5.58 (dq, J=6.7, 48, 1H), 1.74-1.57 (m, 3H).