Reaction of isopropylidene derivative I with thionyl chloride in hexamethylphosphoric triamide afforded chloro derivative II. Removal of the isopropylidene group in II by treatment with a cation-exchanging resin (H+ form) gave the free chloro nucleoside III. reduction of the chloro derivative II with tributylstannane and subsequent removal of the isopropylidene group yielded deoxy derivative V. This was protected with tert-butyldiphenylsilyl group and converted into the mesylate VII. Elimination of the mesyl group followed by desilylation gave 1-(2,3-dideoxy-4-C-methyl-β-D-glycero-pent-2-enofuranosyl)thymine (IX) which was hydrogenated to afford 1-(2,3-dideoxy-4-C-methyl-β-D-glycero-pentofuranosyl)thymine (X). 1-(1-C-Azidomethyl-2-deoxy-β-D-threo-pentofuranosyl)thymine (XIII) was prepared by mesylation of the isopropylidene derivative I, nucleophilic substitution of the mesyl group with azide and removal of the isopropylidene group.
异丙基亚甲基衍生物I与氯化硫酰在六甲基膦酰胺中反应,生成氯代衍生物II。用阳离子交换树脂(H+形式)处理II中的异丙基亚甲基基团,得到游离氯代核苷III。用三丁基锡还原氯代衍生物II,并随后去除异丙基亚甲基基团,得到脱氧衍生物V。这个化合物被叔丁基二苯基硅基保护,并转化为甲磺酸盐VII。去除甲磺基,随后去除硅基,得到1-(2,3-二去氧-4-C-甲基-β-D-glycero-pent-2-enofuranosyl)胸腺嘧啶(IX),通过氢化反应得到1-(2,3-二去氧-4-C-甲基-β-D-glycero-pentofuranosyl)胸腺嘧啶(X)。通过异丙基亚甲基衍生物I的甲磺化,甲磺基的亲核取代反应以及去除异丙基亚甲基基团,制备出1-(1-C-Azidomethyl-2-deoxy-β-D-threo-pentofuranosyl)胸腺嘧啶(XIII)。