Process for preparation of 2-deoxy-2,2-difluoro-D-ribofuranosyl-3,5-hydroxy protected-1-alkyl and aryl sulfonates and their use in preparation of 2',2'-difluoro-2'-deoxy nucleosides
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United States of America Patent
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Jun 13, 1995
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app pub date -
Aug 25, 1993
filing date -
Aug 25, 1993
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Abstract
A stereoselective process for preparing a .beta.-anomer enriched 2-deoxy-2,2-difluoro-D-ribofuranosyl-3,5-hydroxy protected-1-alkyl and aryl sulfonate intermediates by contacting an .alpha.-anomer enriched 2-deoxy-2,2-difluoro-D- ribofuranosyl-3,5-hydroxy protected-1-fluoroalkyl and fluoroaryl sulfonate with a conjugate anion of a sulfonic acid containing the desired alkyl or aryl sulfonate.
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