Johnson Matthey Pharmaceutical Materials, Inc.

Pharma-eco Laboratories, Inc.

Luning Han

Adel M Moussa

Salah A Zahr

David A Swanson

The present invention relates to a method of preparing enantiomers and diastereomers of a 2&prime;,3&prime;-dideoxy-5-fluoro-3&prime;thiocytadine (FTC) or a derivative thereof as represented by the structural formula (I), wherein R is H, a substituted or unsubstituted organic acid radical, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heteroaryl group, a substituted or unsubstituted aralkyl group, a substituted or unsubstituted heteroarakyl group, a substituted or unsubstituted cycloalkyl group, a substituted or unsubstituted heterocycloalkyl group, a substituted or unsubstitued cycloalkylalkyl group, a substituted or unsubstituted heterocycloalkylalkyl group, a sugar or a protecting group.

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Allston, MA, United States of America

Luning Han