as the starting chiron to construct highly functionalized 2-aza-7-thiabicyclo[2.2.1]heptanes and heptenes by means of a [3+2] cycloaddition with acetylenic and olefinic dipolarophiles. Further elimination of either sulfur or hydrogen sulfide leads to acyclic C-nucleosides bearing a heterocyclic moiety of 2-pyridone.
中性离子无环C-核苷(4)充当起始chiron,通过与炔属和烯属双极性亲和剂的[3 + 2]环加成反应,构建高度官能化的2-氮杂-7-
硫代
双环[2.2.1]庚烷和庚烯。
硫或
硫化氢的进一步消除导致带有2-
吡啶酮杂环部分的无环C-核苷。