Reaktion #171550

Reaktionsgleichung

4-bromo-1H-pyrazole

2-chloroethanol

PPh3

DEAD

→

title compound 75

4-Bromo-1-(2-chloroethyl)-1H-pyrazole

Lösungsmittel

THF

Reaktionsbedingungen

Aufarbeitung

1. 1
   EinengenIt was then concentrated under reduced pressure
2. 2
   workup.ADDITIONthe residue was treated with ether
3. 3
   Filtrationthe resultant suspension was filtered
4. 4
   SonstigeThe filtrate was collected
5. 5
   Einengenconcentrated under reduced pressure

Vorschrift

To a solution of 4-bromo-1H-pyrazole (5 g, 34.02 mmol), 2-chloroethanol (2.7 mL, 40.82 mmol) and PPh3 (10.71 g, 40.82 mmol) and in THF (68 mL) at 0° C. was added DEAD (6.4 mL, 40.8 mmol). The mixture was allowed to warm-up to room temperature and stirred overnight. It was then concentrated under reduced pressure, the residue was treated with ether and the resultant suspension was filtered. The filtrate was collected and concentrated under reduced pressure to afford the title compound 75 which was used in the next step without further purification. MS (m/z): 209.0 (M+H).

Quelle