Reaktion #315016

Reaktionsgleichung

DCM

2-fluoro-3-iodopyridine

LDA

1-chloro-3-iodopropane

→

3-(3-Chloropropyl)-2-fluoro-4-iodopyridine

Lösungsmittel

heptane THF

tetrahydrofuran

THF

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.WAITAfter 30 min at −78° C.
2. 2
   Waschenwashed with brine
3. 3
   Trocknendried over MgSO4
4. 4
   Filtrationfiltered
5. 5
   Einengenconcentrated
6. 6
   SonstigeThe residue was purified
7. 7
   workup.ADDITIONFractions containing the product
8. 8
   Einengenwere concentrated
9. 9
   SonstigeLight yellow liquid/solid mixture was collected

Vorschrift

To a −78° C. solution of 2-fluoro-3-iodopyridine (186 mg, 834 μmol) in tetrahydrofuran (4171 μl, 834 μmol) was added a solution of 2M LDA (500 μl, 1.00 mol) in heptane/THF at −78° C. After 1 h at −78° C., 1-chloro-3-iodopropane (512 mg, 2.50 mmol) in 0.5 mL of THF was added to the anion solution slowly at −78° C. After 30 min at −78° C., the reaction was warmed to rt and stirred overnight. The reaction was diluted with DCM, washed with brine, dried over MgSO4, filtered, and concentrated. The residue was purified by performing a column chromatography on silica gel using 95:05 Hex:EtOAc. Fractions containing the product were concentrated. 1H NMR showed product, 3-(3-chloropropyl)-2-fluoro-4-iodopyridine. Light yellow liquid/solid mixture was collected. MS Calcd for C8H8ClFIN: [M]+=299. Found: [M+H]+=300. HRMS Calcd for C8H8ClFIN: [M]+=298.9447. Found: [M+H]+=299.9752. mp=24-25° C.

Quelle