Highly Stereoselective Cobalt(III)-Catalyzed Three-Component C−H Bond Addition Cascade
作者:Jeffrey A. Boerth、Joshua R. Hummel、Jonathan A. Ellman
DOI:10.1002/anie.201603831
日期:2016.10.4
addition across alkene and polarized π‐bonds is reported for which CoIII catalysis was shown to be much more effective than RhIII. The reaction proceeds at ambient temperature with both aryl and alkyl enones employed as efficient coupling partners. Moreover, the reaction exhibits extremely broad scope with respect to the aldehyde input; electron rich and poor aromatic, alkenyl, and branched and unbranched
据报道,在烯烃和极化 π 键之间进行高度立体选择性的三组分 C(sp 2 )−H 键加成,其中 Co III催化比 Rh III更有效。该反应在环境温度下进行,芳基和烷基烯酮均用作有效的偶联伙伴。此外,该反应对于醛的输入表现出极其广泛的范围;富电子和贫电子芳香族、烯基、支链和非支链烷基醛都以良好的收率和高非对映选择性偶联。多个导向基团参与该转化,包括吡唑、吡啶和亚胺官能团。芳香族和烯基C(sp 2 )−H键都会经历三组分加成级联,烯基加成产物很容易转化为非对映体纯的五元内酯。此外,利用N-叔丁亚磺酰亚胺的三组分 C-H 键加成级联证明了Co III催化的 C-H 官能化的第一个不对称反应。这些例子代表了第一个过渡金属催化的 C-H 键加成到N-叔丁亚磺酰亚胺上,它是多用途且广泛使用的胺不对称合成中间体。