New diastereospecific synthesis of 2′,3′-dideoxy-2′- or 3′-C2-branched- or 2′,3′-α-fused-isoxazolidine nucleosides directly from the seconucleoside
作者:A. Papchikhin、J. Chattopadhyaya
DOI:10.1016/s0040-4020(01)90437-5
日期:1994.4
diastereospecific syntheses of [3.3.0]-α-fused-isoxazolidine nucleosides 20 or 24, and 2′- or 3′-C2-branched-2′,3′-dideoxynucleosides 14 or 16 have been reported starting directly from 2′,3′-seconucleoside 3. The key steps involve the unsymmetrical modification of the 2′- or 3′-hydroxyl in the seconucleoside 3 to give pure 8 (3→4→7→8) or 11 (3→5→10→11) and their diastereospecific recyclisation to the
据报道,[3.3.0]-α-融合-异恶唑烷核苷20或24和2'-或3'-C 2-支链2',3'-二脱氧核苷14或16的第一个非对映特异性合成是从2',3'-seconucleoside 3。关键步骤涉及非对称修饰癸二糖苷3中的2'-或3'-羟基,得到纯的8(3 → 4 → 7 → 8)或11(3 → 5 → 10 → 11)及其非对映特异性环化成呋喃糖部分,从而通过自由基或[2 + 3]环加成反应得到标题化合物。