作者:Philippe Bertus、Jean-Bernard Behr、Christophe Laroche、Richard Plantier-Royon、Jan Szymoniak
DOI:10.1055/s-2005-923582
日期:——
The synthesis of the first spirocyclopropyl iminosugar has been achieved in six steps and 13% overall yield from commercially available 2,3,5-tri-O-benzyl-d-arabinose. The synthesis is based on an efficient two-step reaction involving the titanium-mediated aminocyclopropanation of 2,3,5-tri-O-benzyl-4-O-methanesulfonyl-d-arabinononitrile and the subsequent cyclization resulting from in situ nucleophilic attack of the so-formed amine. Addition of a Lewis acid during the cyclopropanation-cyclization sequence greatly improved the yields.
以市场上可买到的 2,3,5-三-O-苄基-d-阿拉伯糖为原料,通过六个步骤合成了首个螺环丙基亚氨基糖,总收率为 13%。该合成基于一个高效的两步反应,包括 2,3,5-三-O-苄基-4-O-甲磺酰基-d-阿拉伯糖腈在钛介导下的氨基环丙烷化反应,以及随后由生成的胺的原位亲核攻击导致的环化反应。在环丙烷化-环化过程中加入路易斯酸大大提高了产量。