Carbocyclic nucleosides and process for obtaining such

A cyclohexenyl compound, including the (−) enantiomer, the (+) enantiomer, and pharmaceutically acceptable salts and esters thereof, the compound represented by formula XVB;

• wherein R1 and R2 are alkyl or alkenyl moieties, wherein
• R1 and R2 are the same or different, and
• alkyl is a saturated, substituted or unsubstituted straight or branched chain hydrocarbon radical having from 1 to 20 carbon atoms,
• alkenyl is the unsaturated congener of the alkyl group, and
• R3, R4 and R5 are alkyl, alkenyl or aryl moieties, wherein:
• R3, R4 and R5 are the same or different, and
• alkyl is a saturated, substituted or unsubstituted straight or branched chain hydrocarbon radical having from 1 to 20 carbon atoms and,
• alkenyl is the unsaturated congener of the alkyl group, and
• aryl represents phenyl or substituted phenyl, and
• R6 is an alkyl, alkenyl or acyl moiety, wherein:
• alkyl is a saturated, substituted or unsubstituted straight or branched chain hydrocarbon radical having from 1 to 20 carbon atoms, and
• alkenyl is the unsaturated congener of the alkyl group, and
• acyl is an alkanoyl or aroyl moiety, wherein alkanoyl is an alkyl carbonyl radical, wherein alkyl is as described above and aroyl represents benzoyl, substituted benzoyl or naphthoyl.