Stereoselective Preparation of Protected Thymine Polyoxin C and Approaches Towards Synthesis of Its C2′-Modified Analogues
作者:Cécile Dehoux、Liliane Gorrichon、Michel Baltas
DOI:10.1002/1099-0690(200103)2001:6<1105::aid-ejoc1105>3.0.co;2-k
日期:2001.3
Polyoxins form an important class of pyrimidine peptide antifungal agents. The preparation of thymine polyoxin C, which is the nucleosidic component of some polyoxins, is reported, together with attempts to synthesize C2′-fluoro analogues. Epimeric 3-hydroxyazidolactones 2a and 2b, obtained from diastereoisomeric epoxy hydroxy esters, were dehydrated to afford butenolide 3. Dihydroxylation and further
多毒素形成一类重要的嘧啶肽抗真菌剂。据报道,胸腺嘧啶多氧嘧啶 C 是一些多氧嘧啶的核苷成分,并尝试合成 C2'-氟类似物。从非对映异构环氧羟基酯获得的差向异构 3-羟基叠氮内酯 2a 和 2b 脱水得到丁烯内酯 3。二羟基化和进一步的功能操作产生了胸腺嘧啶多氧菌素 C。尝试形成 2,2'-脱水核苷并用 DAST 直接亲核氟化单保护核苷未成功。用 NFSI 对叠氮内酯进行亲电氟化可以形成 α-氟内酯,这是制备 C2'-氟类似物的有趣中间体。