反应详情

温度

-10 °C

6.4 g (0.02 mol) of N-benzyloxycarbonyl-L-alanyl-L-proline were dissolved in 75 ml of dry tetrahydrofuran and the solution was cooled to -10° C. 2.54 ml (0.02 mol) of N-ethylmorpholine and 2.62 ml (0.02 mol) of isobutyl chloroformate were added and the solution was stirred at -10° C. for 20 minutes. A solution of 2.25 g (0.02 mol) of cycloheptylamine in 25 ml of dry tetrahydrofuran was then added. The mixture was stirred at 0° C. for 1 hour and then left to stand at room temperature for 16 hours. The mixture was then evaporated and the residue extracted twice with 50 ml of ethyl acetate each time. The combined ethyl acetate extracts were washed successively with 1-N hydrochloric acid, water, 5% sodium bicarbonate solution and water and then dried over magnesium sulphate. Evaporation yielded an oil which solidified upon trituration with petroleum ether. The solid was recrystallised from ethyl acetate/petroleum ether to yield 5.6 g (67.5%) of N-benzyloxycarbonyl-L-alanyl-L-proline cycloheptylamide of melting point 110°-113° C.; [α]D20 =-92.4° (c=1.05% in methanol).

1. stirringThe mixture was stirred at 0° C. for 1 hour
2. waitleft
3. waitto stand at room temperature for 16 hours
4. customThe mixture was then evaporated
5. extractionthe residue extracted twice with 50 ml of ethyl acetate each time
6. washThe combined ethyl acetate extracts were washed successively with 1-N hydrochloric acid, water, 5% sodium bicarbonate solution and water
7. dry with materialdried over magnesium sulphate
8. customEvaporation
9. customyielded an oil which
10. customThe solid was recrystallised from ethyl acetate/petroleum ether