| 摘要 |
The present invention provides an improved process for the preparation of 1,2-Benzisoxazole-3-methanesulphonamide (Zonisamide), an anti-epileptic agent having anti-convulsant and anti-neurotoxic effects. In another aspect, the invention provides a key intermediate, 1,2-benzisoxazole-3-methane sodium sulfonate (BOS-Na:NaCl), isolated as a crystalline sodium chloride associated compound. The BOS-Na:NaCl isolated is directly converted to Zonisamide using a controlled molar ratio of chlorosulfonic acid to avoid conversion to the disulfonated side products.
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