Synthesis of hydroxymethyl branched [3.2.0]bicyclic nucleosides using a regioselective oxetane ring-formation
作者:Nanna K. Christensen、Ann Katrine L. Andersen、Trine R. Schultz、Poul Nielsen
DOI:10.1039/b307667a
日期:——
ring-formation to give after deprotection the bicyclic nucleoside 34. The surprisingly efficient formation of an oxetane was first discovered by serendipity on a corresponding methylfuranoside derivative. The allo-configured bicyclic nucleoside 34 was easily shortened to a ribo-configured analogue 35 by a diol-cleaving reaction and subsequent reduction. Both 34 and 35 are conformationally restricted in the important
已经有效地合成了分别具有一个和两个羟甲基取代基的两个[3.2.0]双环核苷35和34。由双丙酮-D-葡萄糖容易地制备受保护的(3'-C-乙烯基-β-D-烷基呋喃糖基)胸腺嘧啶衍生物28,并且胸腺嘧啶部分被BOM-基团保护。在2'-位引入离去基团后,随后的核苷31用作立体选择性二羟基化和区域选择性氧杂环丁烷环形成的底物,以在脱保护后得到双环核苷34。令人惊奇地有效形成氧杂环丁烷偶然发现了相应的甲基呋喃糖苷衍生物。通过二醇裂解反应和随后的还原,容易将异构型双环核苷34缩短为核糖构型的类似物35。