A full account of our efforts toward an asymmetric redox bicycloisomerization reaction is presented in this article. Cyclopentadienylruthenium (CpRu) complexes containing tethered chiral sulfoxides were synthesized via an oxidative [3 + 2] cycloaddition reaction between an alkyne and an allylruthenium complex. Sulfoxide complex 1 containing a p-anisole moiety on its sulfoxide proved to be the most efficient and selective catalyst for the asymmetric redox bicycloisomerization of 1,6- and 1,7-enynes. This complex was used to synthesize a broad array of [3.1.0] and [4.1.0] bicycles. Sulfonamide- and phosphoramidate-containing products could be deprotected under reducing conditions. Catalysis performed with enantiomerically enriched propargyl alcohols revealed a matched/mismatched effect that was strongly dependent on the nature of the solvent.
本文介绍了我们在不对称氧化还原双环异构化反应方面的努力。通过炔烃和烯丙基钌配合物之间的氧化性[3+2]环加成反应合成了含有连接手性亚砜的环戊二烯基钌(CpRu)配合物。其中,含有苯甲醚基的亚砜的复合物1被证明是对于1,6-和1,7-烯炔的不对称氧化还原双环异构化反应最有效和选择性最高的催化剂。该复合物被用于合成广泛的[3.1.0]和[4.1.0]自行车。磺酰胺和磷酰胺酰基含有的产物可以在还原条件下去保护基。使用对映富集的丙炔醇进行的催化反应表明,在溶剂的性质强烈依赖的情况下,存在匹配/不匹配效应。