The enantioselective synthesis of (-)-(1R,2S,3S)-2-amino-7-[2,3-bis(hydroxymethyl)-cyclobutyl]pyrrolo[2,3-d]pyrimidin-4(3H)-one (5) as the 7-deaza analogue of carbocyclic oxetanocin G is described in 13 steps from trans-3,3-diethoxy-1,2-bis(hydroxymethyl)cyclobutane (8) in an overall yield of 6%. Included in this route is the use of Pseudomonas cepacia lipase for enzymatic resolution.