对阿奇霉素合成中的两种硼酸酯,即阿奇霉素硼酸酯(AZMB)及其前体氮红霉素硼酸酯(AZAB)的水解进行了比较,AZAB的最佳水解条件为:pH=3.0、水解温度30℃、水解时间30 m in,转化率91.9%;AZMB的水解条件为:pH=2.0,温度30℃、反应时间90 m in...对阿奇霉素合成中的两种硼酸酯,即阿奇霉素硼酸酯(AZMB)及其前体氮红霉素硼酸酯(AZAB)的水解进行了比较,AZAB的最佳水解条件为:pH=3.0、水解温度30℃、水解时间30 m in,转化率91.9%;AZMB的水解条件为:pH=2.0,温度30℃、反应时间90 m in,转化率为89.3%。实验表明,AZAB比AZMB更易水解。采用有机酸和无机酸的混合酸代替文献[6]中的无机酸调节水解的pH,可以抑制克拉定糖的酸性降解反应。通过改进后,以红霉素6,9-亚胺醚为原料,阿奇霉素二水化合物的总收率可以达到85%,经HPLC分析,质量分数为98.4%。展开更多
In order to establish the theortetical basis and optimize the production conditions for the separation process of the H3BO3-MgSO4 mixed solution by using Mg（NO3）2 as the salting out agent.The phase diagrams of H3BO3...In order to establish the theortetical basis and optimize the production conditions for the separation process of the H3BO3-MgSO4 mixed solution by using Mg（NO3）2 as the salting out agent.The phase diagrams of H3BO3─MgSO4─Mg（NO3）2─H2O system at 25℃ and 100℃ were studied.The results show that there appear MgSO4·7H2O,MgSO4·6H2O,Mg（NO3）2·6H2O and H3BO3 three crystallization regions in the phase diagram at 25℃,and three crystallization regions of MgSO4·H2O,Mg（NO3）2·2H2O,and H3BO3 at l00℃.When the temperatures rise from 25℃ to 100℃,the crystallization regions for magnesium sulfate hydlates grow larger and while that of H3BO3 get smaller.Only MgSO4·4H2O could be crystallized out alone,if evaporating the H3BO3─MgSO4 solution in the presence of Mg（NO3）2.On cooling the MgSO4 mother liquor,H3BO3 can be separated alone without any addition of water.展开更多
文摘对阿奇霉素合成中的两种硼酸酯,即阿奇霉素硼酸酯(AZMB)及其前体氮红霉素硼酸酯(AZAB)的水解进行了比较,AZAB的最佳水解条件为:pH=3.0、水解温度30℃、水解时间30 m in,转化率91.9%;AZMB的水解条件为:pH=2.0,温度30℃、反应时间90 m in,转化率为89.3%。实验表明,AZAB比AZMB更易水解。采用有机酸和无机酸的混合酸代替文献[6]中的无机酸调节水解的pH,可以抑制克拉定糖的酸性降解反应。通过改进后,以红霉素6,9-亚胺醚为原料,阿奇霉素二水化合物的总收率可以达到85%,经HPLC分析,质量分数为98.4%。
文摘In order to establish the theortetical basis and optimize the production conditions for the separation process of the H3BO3-MgSO4 mixed solution by using Mg（NO3）2 as the salting out agent.The phase diagrams of H3BO3─MgSO4─Mg（NO3）2─H2O system at 25℃ and 100℃ were studied.The results show that there appear MgSO4·7H2O,MgSO4·6H2O,Mg（NO3）2·6H2O and H3BO3 three crystallization regions in the phase diagram at 25℃,and three crystallization regions of MgSO4·H2O,Mg（NO3）2·2H2O,and H3BO3 at l00℃.When the temperatures rise from 25℃ to 100℃,the crystallization regions for magnesium sulfate hydlates grow larger and while that of H3BO3 get smaller.Only MgSO4·4H2O could be crystallized out alone,if evaporating the H3BO3─MgSO4 solution in the presence of Mg（NO3）2.On cooling the MgSO4 mother liquor,H3BO3 can be separated alone without any addition of water.
