Process for the Preparation of Fluticasone Propionate
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United States of America Patent
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app pub date -
Dec 12, 2012
filing date -
Jun 14, 2006
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Abstract
The present invention relates to a process for the preparation of steroidal 17β-carboxylic thioates. More particularly the present invention relates to a convenient and efficient synthesis of steroidal 17β-carboxylic thioates, such as fluticasone propionate I, using soluble mixed fluorides to introduce fluorine by displacing an appropriate leaving group X in compounds II resulting in selective and controlled fluorination. The present invention also relates to intermediates II and their preparation.
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