2-14C Labelled 5-alkyluracils were prepared by condensation of the diethylacetals of α-formyl-carbonic acid esters with 14C-thiourea. Compounds labelled at 4-C were synthesized by condensation of the labelled carboxylic acid derivatives with thiourea. β-Anomers of 5-alkyl-2′-deoxyuridines were obtained in a fairly good radiochemical yield. Alkyl substituents ranged from methyl to tetradecyl, isopropyl and tertbutyl.
2-14C标记的5-烷基尿
嘧啶是通过α-甲酰-
羧酸酯的
二乙基乙缩醛与14C-
硫脲的缩合反应制备的。标记在4-C的化合物是通过标记的
羧酸衍
生物与
硫脲缩合合成的。5-烷基-
2'-脱氧尿苷的β-异构体获得了相当不错的放射
化学产率。烷基取代基的范围从甲基到
十四烷、异丙基和叔丁基。