作者:Markus Kummeter、Uli Kazmaier
DOI:10.1002/ejoc.200300079
日期:2003.9
converted into the versatile protected derivative 11, which could be transformed in excellent yields either into the corresponding piperidine imino sugar 14 or into the unnatural amino acid 17. The imino alcohol 13, an intermediate in the synthesis of imino sugar 14, was also used in a straightforward approach to indolizidinone 19, involving an intramolecular Horner−Emmons reaction for ring-closure. (©
螯合的丙氨酸酯烯醇化物 5 和受保护的苏糖衍生物 6 之间发生非对映选择性羟醛反应,然后在 Mitsunobu 条件下环化,得到哌可林酸衍生物 9。该化合物可以很容易地转化为通用的受保护衍生物 11,可以将其转化为在相应的哌啶亚氨基糖 14 或非天然氨基酸 17 中的产量非常好。亚氨基醇 13 是合成亚氨基糖 14 的中间体,也用于直接合成吲哚里西酮 19,涉及分子内霍纳-埃蒙斯闭环反应。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003)