Abstract

Acyclic enynes having the alkyne moiety directly -connected to the asymmetric carbon atom of an acetal were obtained in two steps. These reactive substrates were then subjected to ruthenium-catalyzed enyne metathesis to produce (5-ethoxy-4--vinyl-2,5-dihydrofuran-2-yl)methanol derivatives in racemic and enantiomerically pure form. These products are useful glycosyl -donors for the preparation of d4T analogues.

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