Reaktion #74049

Reaktionsgleichung

3-bromopyridine-4-thiol

3-Bromopyridine-4-thiol

ethyl 2-bromoisobutyrate

sodium carbonate

→

ethyl 2-(3-bromopyridin-4-ylthio)-2-methylpropanoate

Ausbeute 88.0%

Lösungsmittel

DMF

Reaktionsbedingungen

Aufarbeitung

1. 1
   SonstigeThe reaction mixture was partitioned between water (100 mL) and ethyl acetate (100 mL)
2. 2
   WaschenThe organic layer was washed with water (2×100 mL) and saturated sodium chloride (100 mL)
3. 3
   ExtraktionThe aqueous washes were back extracted with ethyl acetate (2×100 mL)
4. 4
   TrocknenThe combined organic layers were dried over sodium sulfate
5. 5
   Einengenconcentrated
6. 6
   Sonstigepurified by normal phase chromatography (a gradient of 0-25% ethyl acetate in hexane)

Vorschrift

A mixture of 3-bromopyridine-4-thiol (step A, 4.75 g, 25 mmol), ethyl 2-bromoisobutyrate (9.75 g, 50 mmol), and sodium carbonate (7.95 g, 75 mmol) in DMF (50 mL) was stirred at 60° C. for 1 hour. The reaction mixture was partitioned between water (100 mL) and ethyl acetate (100 mL). The organic layer was washed with water (2×100 mL) and saturated sodium chloride (100 mL). The aqueous washes were back extracted with ethyl acetate (2×100 mL). The combined organic layers were dried over sodium sulfate, concentrated, and purified by normal phase chromatography (a gradient of 0-25% ethyl acetate in hexane) to yield ethyl 2-(3-bromopyridin-4-ylthio)-2-methylpropanoate as a pale yellow oil (6.6 g, 88%).

Quelle