Synthetic studies of nucleoside antibiotics: a formal synthesis of (+)-sinefungin
作者:Arun K. Ghosh、Yong Wang
DOI:10.1039/a907228d
日期:——
A formal synthesis of (+)-sinefungin 1 is described. The C-6′ and C-9′ stereogenic centers of sinefungin were constructed stereoselectively by efficient catalytic asymmetric syntheses. The key strategy for the construction of the C-6′ stereocenter involves alkylation of a protected ribose-derived triflate with alkynyl-lithium, Sharpless asymmetric epoxidation of the corresponding allylic alcohol followed
描述了(+)-sinefungin 1的形式合成。西奈芬净的C-6'和C-9'立体异构中心通过有效的催化不对称合成立体选择性地构建。构建C-6'立体中心的关键策略涉及用炔基-锂对受保护的核糖衍生的三氟甲磺酸酯进行烷基化,相应的烯丙醇进行Sharpless不对称环氧化,然后用二异丙氧基钛二叠氮化物进行区域选择性的环氧环开环。C-9氨基酸的立体化学是通过铑手性双膦催化的α-(酰基氨基)丙烯酸酯衍生物的不对称氢化而建立的。所得的氨基酸衍生物已预先转化为(+)-新氟菌素1。