| 摘要 |
A process for the preparation of aminopterin with a purity greater than 90%, which comprises reacting folic acid, with a silazane in an organic solvent at a temperature from 60 to 180° C., the said solvent being a tertiary amine organic solvent, or, if a catalyst which is acid in nature is present, a basic organic solvent or acetonitrile, and further adding water such that there is about 2.8 to 7.0 mole water for each mole of folic acid.
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