Ruthenium(<scp>ii</scp>)-catalyzed regioselective 1,6-conjugate addition of umpolung aldehydes as carbanion equivalents
作者:Hyotaik Kang、Chao-Jun Li
DOI:10.1039/d1sc03732c
日期:——
addition of carbon nucleophiles to electron-deficient ketones. Yet, 1,6-conjugate additions of extended conjugated systems largely remain underexplored due to difficulties in controlling the regioselectivity. Herein, we report umpolung aldehydes as carbanion equivalents for highly regioselective 1,6-conjugate addition reactions to unsaturated ketones, with preliminary studies of the enantioselective variant
构建 C-C 键的最有效和最可靠的方法之一涉及将碳亲核试剂共轭加成到缺电子酮上。然而,由于难以控制区域选择性,扩展共轭体系的 1,6-共轭添加在很大程度上仍未得到充分探索。在这里,我们报告了 umpolung 醛作为碳负离子等价物,用于对不饱和酮进行高度区域选择性的 1,6-共轭加成反应,并对对映选择性变体进行了初步研究。钌( II )催化剂和富电子二齿膦配体的协同作用对于温和反应条件下的反应性和选择性至关重要。