反应详情

1.5 ml of triethylamine are added to a solution of 4.2 g of 4-nitrophenyl 2-(2,6-dichlorophenyl-amino)-phenyl-acetate and 3.6 g of the hydrochloride of the methyl ester of L-leucyl-L-serine in 30 ml of dimethylformamide and the mixture is allowed to react for one hour at room temperature. It is then acidified to pH 5 with 1 N hydrochloric acid and partitioned between chloroform and water. After washing with water, the organic phase is dried and evaporated. The residue is ground with diethyl ether. After recrystallising from a mixture of ethyl acetate and petroleum ether, the methyl ester of N-{[2-(2,6-dichlorophenyl-amino)-phenyl]-acetyl}-L-leucyl-L-serine is obtained as colourless crystals; melting point 216°-218°: [α]D =-30° (c=0.635 in chloroform).

1. customto react for one hour at room temperature
2. custompartitioned between chloroform and water
3. washAfter washing with water
4. customthe organic phase is dried
5. customevaporated
6. customAfter recrystallising from a mixture of ethyl acetate and petroleum ether