Synthesis of Enantiomerically Pure 2′,3′,5′-Trideoxy-4′-[(diethoxyphosphoryl)difluoromethyl]thymidine Analogues
作者:Alberto Arnone、Pierfrancesco Bravo、Massimo Frigerio、Andrea Mele、Barbara Vergani、Fiorenza Viani
DOI:10.1002/(sici)1099-0690(199909)1999:9<2149::aid-ejoc2149>3.0.co;2-d
日期:1999.9
synthesized using the building block approach, starting from chiral fluorinated molecules. The key steps of the synthetic sequence were condensation of 2-methyl-5-(4-methylphenylsulfinyl)pent-2-ene (1) and ethyl 2-(diethoxyphosphoryl)-2,2-difluoroacetate (2), reduction of the thus formed ketones 3 to alcohols 4, reductive removal of the sulfur moiety to give hydroxy phosphonates 6, and oxidative cyclization
D- 和 L-(二乙氧基磷酰基)二氟甲基核苷类似物 10 已使用构建块方法从手性氟化分子开始合成。合成顺序的关键步骤是 2-甲基-5-(4-甲基苯基亚磺酰基)戊-2-烯 (1) 和 2-(二乙氧基磷酰基)-2,2-二氟乙酸乙酯 (2) 的缩合,从而还原将酮 3 形成为醇 4,还原去除硫部分得到羟基膦酸酯 6,然后氧化环化得到呋喃糖衍生物 8。