Synthetic studies on an ABC-ring model of tubiferal A, a triterpenoid isolated from the fruit bodies of the Tubifera dimorphotheca myxomycete, are described. The stereogenic centers at the angular positions were constructed through the stereoselective addition of a C-ring allylborane followed by an Eschenmoser–Claisen rearrangement reaction prior to the formation of the AB-ring system by a double intramolecular
描述了对 Tubifera dimorphotheca myxomycete 子实体分离的三萜类 tubiferal A ABC 环模型的合成研究。在通过二氯腈中间体的双分子内烷基化反应形成 AB 环系统之前,通过立体选择性加成 C 环烯丙基硼烷,然后进行 Eschenmoser-Claisen 重排反应来构建角位置的立体中心。
Regio- and Stereoselective Iodoamination of Ferrocene-Containing Allenylphosphonates: Synthesis of Multifunctional Tetrasubstituted Allylic Amines and Allylic Azides
and stereoselective synthesis of multifunctional tetrasubstituted allylicamines and azides based on iodoamination of ferrocene-containing allenylphosphonates with anilines and sodium azide is described. A tetrasubstituted olefin moiety, as well as an iodine atom, a phosphonate, and a ferrocene group, are installed to the allylicamine motif simultaneously in moderate to good yields.