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| Continuous preparation of 7-amino-3-vinylcephalosporanic acid catalyzed by superprotic acid and study on the mechanism of one-step deprotection |
| Bai Liyao, Zhang Huirong |
| NCPC Hebei Huamin Pharmaceutical Corporation Ltd., Shijiazhuang 052160, China |
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Abstract After dehydration of GVNE reaction solution, catalyzed by super proton acid, GVNE reacts directly with phenol without crystallization to hydrolyze off the 4-position protective group, thus realizing continuous preparation, thus reducing the solvent loss and energy consumption in the preparation process, and the product prepared is different from the original technology. The reaction mechanism of two kinds of racing reaction was introduced in detail in the continuous reaction method.
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