Reaktion #74590

Reaktionsgleichung

1,2-dibromoethane

tri-2-furylphosphine

tert-Butyl 3-iodoazetidine-1-carboxylate

tert-butyl(4-chloro-2-iodophenoxy)dimethylsilane

Chlorotrimethylsilane

→

title compound

tert-Butyl 3-(2-{[tert-butyl(dimethyl)silyl]oxy}-5-chlorophenyl)azetidine-1-carboxylate

Lösungsmittel

N,N-dimethylformamide

Reaktionsbedingungen

Aufarbeitung

1. 1
   Temperaturbefore cooling to room temperature
2. 2
   Temperaturthe mixture heated to 60° C. for 10 minutes
3. 3
   Temperaturthen cooled to room temperature
4. 4
   Temperaturthen heated at 70° C. for 5 hours before concentration in vacuo
5. 5
   SonstigeThe residue was partitioned between ethyl acetate (100 ml) and aqueous sodium carbonate solution (50 ml)
6. 6
   ExtraktionThe organic extract
7. 7
   Trocknenwas dried over sodium sulphate
8. 8
   Filtrationfiltered
9. 9
   Sonstigeevaporated in vacuo

Vorschrift

Zinc powder (700 mg, 10.7 mmol) was suspended in N,N-dimethylformamide (20 ml) under nitrogen. 1,2-dibromoethane (120 ul) was added and suspension heated to 60° C. for 10 minutes before cooling to room temperature. Chlorotrimethylsilane (180 ul) was added and the mixture heated to 60° C. for 10 minutes then cooled to room temperature. tert-Butyl 3-iodoazetidine-1-carboxylate (3.0 g, 10.6 mmol) was added with a slight exotherm observed. The mixture was stirred at room temperature for 1 hour before the addition of tert-butyl(4-chloro-2-iodophenoxy)dimethylsilane (Preparation 239, 2.2 g, 5.97 mmol) followed immediately by tri-2-furylphosphine (250 mg, 1.08 mmol) and (1E,4E)-1,5-diphenylpenta-1,4-dien-3-one-palladium (2:1) (300 mg, 0.52 mmol). The mixture was stirred at room temperature for 30 minutes then heated at 70° C. for 5 hours before concentration in vacuo. The residue was partitioned between ethyl acetate (100 ml) and aqueous sodium carbonate solution (50 ml). The organic extract was dried over sodium sulphate, filtered and evaporated in vacuo to afford the title compound as a brown oil, 3.2 g,

Quelle