反应详情

To a suspension of 21.45 g of N-carbobenzoxy-carbonyl-L-isoglutamine ethyl ester in 200 mL of dry tetrahydrofuran kept at 0° C. to -5° C. in an ice-bath 11.82 mL of pyridine is added. To the above solution 9.84 mL of trifluoroacetic anhydride in 100 mL of tetrahydrofuran is added dropwise at such a rate that the bath temperatue is maintained. The solution is stirred for 2 hours at this temperature. The solution is evaporated to dryness and the oil is dissolved in ethyl acetate. The organic layer is washed with 1.0 N hydrochloric acid and sterile water. The solution dried and evaporated in vacuo to give an oil to give 14.8 g of ethyl γ-(N-carbobenzoxy)amino-γ-cyanobutanoate, 17.

1. customkept at 0° C. to -5° C. in an ice-bath
2. temperatureis maintained
3. customThe solution is evaporated to dryness
4. dissolutionthe oil is dissolved in ethyl acetate
5. washThe organic layer is washed with 1.0 N hydrochloric acid and sterile water
6. customThe solution dried
7. customevaporated in vacuo
8. customto give an oil