反应详情

温度

-15 °C

1.03 Grams of Z-Ser-Leu-NHNH2 was dissolved in 15 ml of dimethylformamide, then 1.41 ml of 6N-hydrochloric acid/dioxane was further added thereto, and the mixture was cooled to -15° C., then 0.38 ml of isoamyl nitrite was added under a stirring condition. After the reaction mixture shows a negative reaction in hydrazide test, then a cold solution of 0.40 ml of dimethylformamide with 1.18 ml of triethylamine was added drop by drop in small amounts to neutralize the reaction mixture. This reaction mixture containing the azide was added to 10 ml of a cold dimethylformamide solution containing H-Arg-Ser-Lys(Tos)-Glu-OH obtained in the above-mentioned step 5(a) and 0.66 ml of triethylamine, then whole mixture was stirred at -10° to -15° C. for 2 hours, and at 4° C. for 20 hours. Dimethylformamide was removed by distillation under a reduced pressure and the residue thus obtained was extracted with n-butanol saturated with water and the butanol layer was wahsed 5 times with water being saturated with n-butanol and the solvent was removed by distillation. The residue was solidified by adding ethyl ether, and reprecipitated from methanol-ethyl acetate to obtain 1.92 g of the desired product.

1. waitat 4° C. for 20 hours
2. customDimethylformamide was removed by distillation under a reduced pressure
3. customthe residue thus obtained
4. extractionwas extracted with n-butanol saturated with water
5. customthe solvent was removed by distillation
6. additionby adding ethyl ether
7. customreprecipitated from methanol-ethyl acetate