Reaktion #5642

Reaktionsgleichung

Z-1-propenyl tri-n-butylstannane

diphenylmethyl 7-phenoxyacetamido-3-[(fluorosulfonyl) oxy]-3-cephem-4-carboxylate

→

title compound

Ausbeute 92.9%

Diphenylmethyl 7-Phenoxyacetamido-3-(Z-1-propenyl)-3-cephem-4carboxylate

Ausbeute 92.9%

Lösungsmittel

dichloromethane

dichloromethane

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.STIRRINGto stir for 10 minutes
2. 2
   Waschenwashed with water (1×10 mL)
3. 3
   TrocknenThe organic fraction was dried over magnesium sulfate
4. 4
   Filtrationpurified by flash filtration through a pad of silica gel (W. R. Grace, 951W) first with dichloromethane (50 mL)
5. 5
   Sonstigeto remove the residual stannane
6. 6
   Einengenwith 10% ethyl acetate in dichloromethane (50 mL) which upon concentration

Vorschrift

A solution of palladium (II) acetate (3.6 mg, 0.016 mmole, 0.1 eq.) in dichloromethane (2 mL) was treated with Z-1-propenyl tri-n-butylstannane (66.2 mg, 0.2 mmole, 1.2 eq.) under an inert atmosphere and allowed to stir for 3 minutes. The resulting dark suspension was then treated with diphenylmethyl 7-phenoxyacetamido-3-[(fluorosulfonyl) oxy]-3-cephem-4-carboxylate (100.0 mg, 0.16 mmole, 1.0 eq.) in one portion and the reaction mixture was allowed to stir for 10 minutes. The reaction mixture was diluted with additional dichloromethane and washed with water (1×10 mL). The organic fraction was dried over magnesium sulfate and purified by flash filtration through a pad of silica gel (W. R. Grace, 951W) first with dichloromethane (50 mL) to remove the residual stannane and then with 10% ethyl acetate in dichloromethane (50 mL) which upon concentration furnished 80.4 mg (89%) of the title compound as a pale yellow solid. The product was then recrystallized from isopropyl alcohol to afford 62.3 mg (69%) of a white solid, mp. 103°-104° C.

Quelle