用四氟化硫处理(+)-L-酒石酸二甲酯(I)导致形成中间体2-氟-1,2-双(甲氧基羰基)乙基氟亚硫酸盐(II),该中间体在氟化氢的作用下,存在于反应混合物中的化合物被转化为(-)(2S:3S)-2-氟-3-羟基琥珀酸二甲酯(III)。后者与SF 4的反应产生了内消旋2,3-二氟琥珀酸二甲酯(IV)。通过1 H和19 F NMR确定获得的化合物的结构和构型。在过量氟化氢的存在下,用四氟化硫处理(+)-L-酒石酸二甲酯(I),以96%的收率得到了Meso-2,3-二氟琥珀酸二甲酯。
The synthesis of a thiobutyrolactone as precursor of modified nucleosides is reported from a fluoroxanthate and a protected allylic alcohol. This approach opens a new and straightforward route for the synthesis of 2',3'-dideoxy-2'-fluoro-4'-thiothymidine derivatives in few steps, including the formation of a fluorothiolactone and a Vorbruggen thymine base alkylation reaction.