Cooperative Catalysis of Metal and OH⋅⋅⋅O/sp<sup>3</sup>-CH⋅⋅⋅O Two-Point Hydrogen Bonds in Alcoholic Solvents: Cu-Catalyzed Enantioselective Direct Alkynylation of Aldehydes with Terminal Alkynes
作者:Takaoki Ishii、Ryo Watanabe、Toshimitsu Moriya、Hirohisa Ohmiya、Seiji Mori、Masaya Sawamura
DOI:10.1002/chem.201301280
日期:2013.9.27
with a transition‐metal center in alcoholic solvents for enantioselective catalysis. Copper(I) complexes with prolinol‐based hydroxy amino phosphane chiral ligands catalytically promoted the direct alkynylation of aldehydes with terminal alkynes in alcoholic solvents to afford nonracemic secondary propargylic alcohols with high enantioselectivities. Quantum‐mechanical calculations of enantiodiscriminating
与酶催化相反,人造催化剂中的催化剂-底物氢键通常发生在质子惰性溶剂中,而不是质子溶剂中。我们报道了一种情况,其中配体与底物的氢键相互作用与含酒精溶剂中的过渡金属中心协同进行对映选择性催化。在醇溶剂中,具有脯氨醇基羟基氨基膦手性配体的铜(I)配合物催化促进醛与末端炔的直接烷基化,从而提供具有高对映选择性的非外消旋仲炔丙醇。enantiodiscriminating过渡态的量子力学的计算表明一个非经典SP的发生3 -C H⋅⋅⋅O氢键是配体与底物之间的次要相互作用,这导致了催化剂-底物的高方向性两点氢键。