Réaction #83255

Équation de réaction

N,N-diethyl-4-bromobenzenesulfonamide

NaHCO3

DMF

methyl acrylate

→

methyl 4-(diethylaminosulfonyl)benzene 2-propenoate

Rendement 63.0%

Solvants

ether

water

Conditions de réaction

Traitement

1. 1
   TempératureThe reaction was cooled
2. 2
   Autrethe layers were separated
3. 3
   Filtrationthe ether layer was filtered
4. 4
   Autreto remove Pd (0)
5. 5
   SéchageThe combined ether solutions were dried over MgSO4
6. 6
   Filtrationfiltered
7. 7
   Autrerecrystallized from methanol/ether

Mode opératoire

To 14.5 g of N,N-diethyl-4-bromobenzenesulfonamide (50 mmol) (prepared by reaction of 4-bromobenzenesulfonyl chloride with diethylamine) was added 13.8 g of tetrabutylammonium chloride (50 mmol), 10.3 g of NaHCO3 (124 mmol), 266 mg of palladium (II) acetate (1.07 mmol) and 100 mL of DMF in the order given. To this suspension was added 8.8 ml of methyl acrylate (98 mmol) and the reaction was stirred 1 hour at 80°. The reaction was cooled, 500 mL of water and 900 mL of ether were added, the layers were separated and the ether layer was filtered to remove Pd (0) and combined with 2 further ether washes of the aqueous phase. The combined ether solutions were dried over MgSO4, filtered, stripped and recrystallized from methanol/ether to yield 9.4 g of methyl 4-(diethylaminosulfonyl)benzene-2-propenoate. Six grams of the propenoate was reduced in ethanol at 3.5 atm over 10% Pd on carbon in a Parr Shaker to produce 5.9 g of product as a yellow oil. It was used in that form in Example 269.

Source