Steric Tuning of Silylacetylenes and Chiral Phosphine Ligands for Rhodium-Catalyzed Asymmetric Conjugate Alkynylation of Enones
作者:Takahiro Nishimura、Xun-Xiang Guo、Nanase Uchiyama、Taisuke Katoh、Tamio Hayashi
DOI:10.1021/ja710540s
日期:2008.2.6
Rhodium-catalyzed asymmetric conjugate alkynylation of α,β-unsaturated ketones giving β-alkynylketones took place in high yields with high enantioselectivity. The reaction was realized by use of (triisopropylsilyl)acetylene combined with (R)-DTBM-segphos as a chiral phosphine ligand, where the sterically bulky substituents on the silicon and phosphorus atoms suppress the alkyne dimerization.
铑催化的 α,β-不饱和酮的不对称共轭炔基化以高产率和高对映选择性发生 β-炔基酮。该反应是通过使用(三异丙基甲硅烷基)乙炔与(R)-DTBM-segphos 结合作为手性膦配体来实现的,其中硅和磷原子上的空间庞大的取代基抑制炔二聚化。