xymethylene-3′-deoxythymidine is reported. Key steps involve diastereoselective lactonization, enantioselective enzymatic ester hydrolysis and diastereoselective glycosidation of a key intermediate with thymine with 100% β-selectivity via Lewis acid mediated cleavage of a [3.2.1] oxabicyclic lactone.
报道了新颖的5'-(S)-甲基-3'-羧亚甲基-3'-脱氧
胸苷的合成。关键步骤包括通过Lewis酸介导的[3.2.1]氧双环内酯裂解,非对映选择性内酯化,对映选择性酶酯
水解和关键中间体与胸腺
嘧啶的非对映选择性糖苷化,β选择性为100%。