Synthesis and Antitumour Properties of 2-Thio-5-chloro-nucleosides
摘要:
Four methods are described for the synthesis of 2-thio-5-chlorouracil (($) under bar 1). beta- and alpha-5-Chloro-2-thio-2'-deoxyuridines (($) under bar 12 and ($) under bar 13) were obtained by Lewis acid catalysed condensation of TMS derivative of ($) under bar 1 with 2-deoxy-3,5-di-O-p-toluyl-alpha-D-ribosyl chloride and deblocking of toluylated derivatives with methanolic ammonia. Selective enzymatic phosphorylation of ($) under bar 12 led to its 5'-monophosphate, the latter being a moderate inhibitor of thymidylate synthase, while ($) under bar 12 showed moderate cytotoxicity in vitro against mouse leukemic cells L15178Y.