A series of new N-alkyl-3-hydroxypiperidine derivatives containing a five-membered hemiketal were synthesized from 1-C-acetylmethyl sugars. Based on the stereochemistry of the products obtained, a plausible mechanism is illustrated. A new approach to the hemiketal, which has undergone hydrogenation in the presence of Pd/C and beta-elimination and intramolecular cycloaddition with 1% NaOMe in methanol
从 1-C-乙酰甲基
糖类合成了一系列含有五元半
缩酮的新 N-烷基-
3-羟基哌啶衍
生物。基于所得产物的立体
化学,阐明了一种可能的机制。报道了一种半
缩酮的新方法,该方法在 Pd/C 存在下进行氢化,β-消除和分子内环加成与
甲醇中的 1% NaOMe。