发明授权
US07799921B2 Stereoselective process and crystalline forms of a camptothecin 有权
喜树碱的立体选择性方法和结晶形式

Stereoselective process and crystalline forms of a camptothecin
摘要:
A stereoselective process for preparing 7-[(E)-t-butyloxyiminomethyl]-camptothecin (also known as gimatecan) is herein disclosed. With the addition of further dissolution and precipitation steps carried out in appropriate different solvent mixtures, four new crystalline forms of gimatecan are also obtainable by using the same stereoselective process.
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