Reaktion #7054

Reaktionsgleichung

carbon monoxide

5-bromothiophene-2-sulfonamide

triethyl amine

1,3-bis(diphenylphosphino) propane

ethyl acetate

→

title compound

5-(Methoxycarbonyl)thiophene-2-sulfonamide

Lösungsmittel

methanol

dimethylformamide

brine

Reaktionsbedingungen

Aufarbeitung

1. 1
   SonstigeThe organic phase is separated
2. 2
   Extraktionthe aqueous layer is extracted with 10 mL ethyl acetate
3. 3
   TrocknenThe combined organic layers are dried over sodium sulfate
4. 4
   Einengenconcentrated in vacuo
5. 5
   Sonstigechromatographed on silica (0–1% methyl alcohol in methylene chloride)

Vorschrift

A mixture of 5-bromothiophene-2-sulfonamide (0.50 g, 2.1 mmol), triethyl amine (1 mL), methanol (1 mL), palladium acetate (0.046 g, 2.1 mmol) and 1,3-bis(diphenylphosphino) propane (0.085 g, 2.1 mmol) (addition in that order) in dimethylformamide (5 mL, anhydrous) is saturated with carbon monoxide gas, at room temperature. This reaction mixture is heated to 100° C. and stirred overnight, under a carbon monoxide atmosphere. 10 mL of brine and 10 mL of ethyl acetate are added to the reaction mixture. The organic phase is separated and the aqueous layer is extracted with 10 mL ethyl acetate. The combined organic layers are dried over sodium sulfate, concentrated in vacuo, and then chromatographed on silica (0–1% methyl alcohol in methylene chloride) to give the title compound, as a yellow solid (0.15 g, 34% yield).

Quelle