The synthesis of unprecedented branched pyrrolizidines and indolizidines was accomplished via nitrone chemistry. The required ketonitrone, a known intermediate usually obtained as a mixture of regioisomers, was prepared in a pure form from d-arabinose by a sequence of oximation/reduction/oxidation steps. Nucleophilic vinylation or allylation followed by ring-closing metathesis of the corresponding
前所未有的支链
吡咯并核苷和
吲哚并核苷的合成是通过硝酮
化学方法完成的。通过一系列的
肟化/还原/氧化步骤,由d-
阿拉伯糖以纯净的形式制备所需的酮硝酮,这是一种通常以区域异构体混合物形式获得的已知中间体。亲核性
乙烯基化或烯丙基化,然后相应的N-allylpyrrolidines闭环易位,提供了靶向的亚
氨基糖,这证明了
水稻(GH31家族)α-
葡萄糖苷酶的有效和选择性
抑制剂。