Carbanucleoside synthesis and novel intermediate compounds useful therein
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United States of America Patent
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Feb 25, 2014
Grant Date -
Mar 14, 2013
app pub date -
May 30, 2011
filing date -
May 31, 2010
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Abstract
Anti-virally active carbanucleosides such as entecavir are prepared by a process which utilizes, throughout the synthesis, an aromatic protectant group for the hydroxyl and the alkyl hydroxy groups of the starting material, removed as the final step of a multi-step synthesis. Such protectant groups yield intermediates which are solid and therefore easily purified at various stages of the process, for an economical and relatively fast process for synthesizing the final product.
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