Gold Catalysis: Tandem Reactions of Diyne-Diols and External Nucleophiles as an Easy Access to Tricyclic Cage-Like Structures
作者:A. Stephen K. Hashmi、Miriam Bührle、Michael Wölfle、Matthias Rudolph、Marcel Wieteck、Frank Rominger、Wolfgang Frey
DOI:10.1002/chem.201001322
日期:2010.8.23
structure analysis. Overall, eight new bonds are formed in the reaction, which proceeds by a multistep sequence of highly selective hydroalkoxylations and hydrohydroxylation or hydroaminations. For furyl substituents and for internal alkynes competing reaction pathways could be identified. By the cross‐coupling of a product with an iodoaryl substituent, the use of these cage compounds as geometrically defined
通过双向合成制备了由两个末端均炔丙基醇基组成的不同的二炔二醇。在外部亲核试剂(例如水或苯胺)的存在下,使顺非对映异构体经受NAC-金催化剂(NAC =氮无环卡宾)的影响,从而提供了取代的高刚性杂环笼。相应的抗灾难异构体发生了聚合。合成物反应的中间产物非对映异构体可以被分离,甚至可以通过晶体结构分析来表征。总的来说,在反应中形成了八个新的键,该键通过多步骤的高选择性加氢烷氧基化和加氢羟基化或加氢胺化反应进行。对于呋喃基取代基和内部炔烃,可以确定竞争反应途径。通过产品与碘芳基取代基的交叉偶联,可以证明通过正交过渡金属催化的方法,即金和钯的催化作用,将这些笼状化合物用作几何定义的连接基团。