作者:A. Papchikhin、P. Agback、J. Plavec、J. Chattopadhyaya
DOI:10.1016/0040-4020(94)00950-y
日期:1995.1
The first diastereospecific synthesis of [3.3.0]- and [3.4.0]-α-cis-fused-carbocyclic nucleosides 10, 12 and 20, starting directly from 2′-O-(TBDMS) or 3′-O-(TBDMS) derivatives of 5′-O-MMTr-2′,3′-seco-ribo-thymidines, 1 and 13 (ref. 4), have been reported. The key steps involve the unsymmetrical modification of the 2′- and 3′-hydroxyls in seconucleosides 1 and 13 and their diastereospecific recyclisation
的第一diastereospecific合成[3.3.0] -和[3.4.0]-α -顺式稠合的碳环核苷10,12和20,直接从起始2'-O-(TBDMS)或3'-O-(已经报道了5'-O-MMTr-2',3'-seco-核糖胸腺嘧啶核苷1和13的TBDMS)衍生物(参考文献4)。的关键步骤涉及2'-和3'-羟基的在seconucleosides不对称变形例1和13使用任一自由基环化及其diastereospecific recyclisation到呋喃糖稠合碳环[1→2→3(72%)→4( 90%)→5(83%)→6→7(77%)→8(61%)→9(41%)和11(42%); 9→10(87%)&11→12(84%)]或Diels-Alder反应[ 13→14→15(91%)→ 16(80%)→ 17→18(36%)→ 19(69%)→ 20(84%)]。