An optically active pseudo-sugar, pseudo-α-D-arabinofuranose, was synthesized from D-arabinose in favorable overall yield by using a stereoselective formation of branched nitropyranose as the key step.Furthermore, two biologically active pseudo-β-D-arabinofuranosylnuleosides, (+)-cyclaradine and (+)-1-pseudo-β-D-arabinofuranosyluracil, were synthesized via Michael-type reactions of nucleic acid bases and a nitrocyclopentene derivative which was prepared from a synthetic intermediate of pseudo-D-arabinofuranose.
以支链硝基
吡喃糖的立体选择性形成为关键步骤,从
D-阿拉伯糖合成了一种具有光学活性的假糖--假-
α-D-阿拉伯呋喃糖,总收率很高。此外,通过核酸碱基与硝基
环戊烯衍
生物的迈克尔型反应,合成了两种具有
生物活性的假β-D-阿拉伯
呋喃糖核苷,即(+)-环拉定糖和(+)-1-假β-D-阿拉伯
呋喃糖尿
嘧啶,后者是由假-D-阿拉伯
呋喃糖的合成中间体制备的。