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2′,3′‐Dideoxyinosine‐13C5 (ddI‐13C5) and the related 2′,3′‐dideoxyadenosine‐13C5 (ddA‐13C5) were prepared from (S)‐5‐[13C5]2,3‐dideoxyribonolactone 1. From a batch of this starting material ddI‐13C5 was made in 27% overall yield in seven steps and ddA‐13C5 in five steps and 14% overall yield. The known synthesis of ddI‐13C5 from glucose‐13C6 took 18‐steps; therefore the present work is a substantial...