Reaktion #2075716

Reaktionsgleichung

2-isopropoxy-4,4,5,5-tetramethyl-1,3,2-dioxaborolane

isopropyl-magnesium chloride

1-Bromo-4-chloro-2,5-difluorobenzene

diethyl ether

→

title compound

Ausbeute 72.3%

2-(4-Chloro-2,5-difluorophenyl)-4,4,5,5-tetramethyl-[1,3,2]dioxaborolane

Ausbeute 72.3%

Lösungsmittel

THF

THF

tetrahydrofuran

Reaktionsbedingungen

Aufarbeitung

1. 1
   Temperaturto warm toward 0° C. for 1 hour
2. 2
   Temperaturcooled to −10° C. again
3. 3
   Temperaturto warm to ambient temperature
4. 4
   Extraktionextracted with 1N sodium hydroxide twice
5. 5
   Extraktionextracted with dichloromethane twice
6. 6
   Sonstigedried
7. 7
   Filtrationfiltered
8. 8
   Einengenconcentrated

Vorschrift

1-Bromo-4-chloro-2,5-difluorobenzene (1.11 g, 4.9 mmol) was dissolved in tetrahydrofuran (THF; 15 mL) and cooled to −10° C. A 2.0M solution of isopropyl-magnesium chloride (2.7 mL, 5.4 mmol) in THF was added dropwise via a syringe. The reaction mixture was stirred at −10° C. for 1 hour, allowed to warm toward 0° C. for 1 hour, then cooled to −10° C. again. A solution of 2-isopropoxy-4,4,5,5-tetramethyl-1,3,2-dioxaborolane (1.0 g, 5.4 mmol) in THF (1.0 mL) was then added dropwise and the reaction was allowed to warm to ambient temperature. The reaction mixture was then added to diethyl ether and extracted with 1N sodium hydroxide twice. The aqueous phases were combined, acidified to pH 3 with concentrated HCl, and extracted with dichloromethane twice. The organic phases were combined, dried, filtered and concentrated to give the title compound (0.97 g, 72.3% yield) that was used without further purification: 1H NMR (CDCl3): δ 7.45 (dd, 1H), 7.09 dd, 1H), 1.36 (s, 12H).

Quelle