Deconjugative electrophilic fluorination of the lithium dienolate of Z-α,β-unsaturated imide (+)-9 with N-fluorobenzenesulfonimide (NFSi) afforded the E-β,γ-unsaturated α-fluoro imide (+)-10 as a single diastereoisomer. Dihydroxylation resulted in the formation of 2-fluoro-2-deoxy-γ-xylonic and -lyxonic lactones, 12a and 12b, respectively. Reduction and deprotection of the lactones afforded 2-deox
Z -α,β-不饱和
酰亚胺(+)- 9的二烯酸
锂与N-
氟苯磺
酰亚胺(NFSi)的去共轭亲电
氟化得到E -β,γ-不饱和α-
氟酰亚胺(+)- 10作为单一非对映异构体。二羟基化分别形成2-
氟-2-脱氧-γ-
木糖基内酯和-Lyxonic内酯12a和12b。内酯的还原和脱保护得到2-脱氧-2-
氟-
木糖基-
吡喃糖(15)和2-脱氧-2-
氟-
木糖基-1-
吡喃糖(17)。