反应详情

温度

10 °C

A solution of 0.144 g of N-acetyl-L-alanine in 10 ml tetrahydrofuran was cooled to −10° C. and treated with 0.140 ml of N-ethylmorpholine and 0.143 ml of isobutyl chloroformate. The mixture was stirred for a further 10 minutes at 10° C. and then treated with 0.459 g of (E)-2(R)-[1(S)-[(tetrahydro-2(RS)-pyranyloxy)carbamoyl]-4-phenyl-3-butenyl]-2′-isobutyl-4-methylvalerohydrazide. The mixture was allowed to warm to 0° C. and stirring was continued for 1.5 hours. The mixture was then diluted with ethyl acetate and washed in sequence with 5% aqueous citric acid, 5% aqueous sodium hydrogen carbonate and brine. Drying over magnesium sulphate and evaporation gave 0.601 g of (E)-2′-(N-acetyl-L-alanyl)-2(R)-[1(S)-(tetrahydro-2(RS)-pyranyloxy)carbamoyl]-4-phenyl-3-butenyl]-2′-isobutyl-4-methylvalerohydrazide in the form of a white solid.

1. temperatureto warm to 0° C.
2. stirringstirring
3. waitwas continued for 1.5 hours
4. washwashed in sequence with 5% aqueous citric acid, 5% aqueous sodium hydrogen carbonate and brine
5. dry with materialDrying over magnesium sulphate and evaporation