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Open AccessArticle

Application of Heterogeneous Catalysts in the First Steps of the Oseltamivir Synthesis

Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), Facultad de Ciencias, CSIC—Universidad de Zaragoza, E-50009 Zaragoza, Spain
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Catalysts 2017, 7(12), 393; https://doi.org/10.3390/catal7120393
Received: 17 November 2017 / Revised: 7 December 2017 / Accepted: 12 December 2017 / Published: 17 December 2017
The first steps of oseltamivir synthesis from quinic acid involve acetalization and ester formation. These reactions are catalyzed by either acids or bases, which may be accomplished by heterogeneous catalysts. Sulfonic solids are efficient acid catalysts for acetalization and esterification reactions. Supported tetraalkylammonium hydroxide or 1,5,7-triazabicyclo[4.4.0]dec-5-ene are also efficient base catalysts for lactone alcoholysis and in this work, these catalysts have been applied in two alternative synthetic routes that lead to oseltamivir. The classical route consists of an acetalization, followed by a lactonization, and then a lactone alcoholysis. This achieves a 66% isolated yield. The alternative route consists of esterification followed by acetalization and is only efficient when an acetone acetal is used. View Full-Text
Keywords: heterogeneous catalysis; acetalization; lactonization; esterification; sulfonic solids; oseltamivir heterogeneous catalysis; acetalization; lactonization; esterification; sulfonic solids; oseltamivir
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MDPI and ACS Style

Fraile, J.M.; Saavedra, C.J. Application of Heterogeneous Catalysts in the First Steps of the Oseltamivir Synthesis. Catalysts 2017, 7, 393.

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