Synthesis of α-Quaternary Formimides and Aldehydes through Umpolung Asymmetric Copper Catalysis with Isocyanides
作者:Kentaro Hojoh、Hirohisa Ohmiya、Masaya Sawamura
DOI:10.1021/jacs.6b12881
日期:2017.2.15
A highly regio- and enantioselective copper-catalyzed three-component coupling of isocyanides, hydrosilanes, and γ,γ-disubstituted allylic phosphates/chlorides to afford chiral α-quaternary formimides was enabled by the combined use of our original chiral naphthol-carbene ligand as a functional Cu-supporting ligand and LiOtBu as a stoichiometric Lewis base for Si. The formimides were readily converted
通过结合使用我们原始的手性萘酚-卡宾配体,实现了高度区域选择性和对映选择性铜催化的异氰化物、氢硅烷和 γ,γ-二取代的烯丙基磷酸酯/氯化物的三组分偶联,以提供手性 α-季铵甲酰亚胺。功能性 Cu 支持配体和 LiOtBu 作为 Si 的化学计量路易斯碱。甲酰亚胺很容易转化为α-季醛。
Construction of All‐Carbon Chiral Quaternary Centers through Cu
<sup>I</sup>
‐Catalyzed Enantioselective Reductive Hydroxymethylation of 1,1‐Disubstituted Allenes with CO
<sub>2</sub>
construction of all-carbon chiral quaternary centers through reductive hydroxymethylation of 1,1-disubstituted allenes with CO2 has been developed. In the presence of a copper/Mandyphos catalyst, CO2 is transformed into an alcohol oxidation level by an asymmetric reductive C-C bond formation with allenes by using hydrosilane (HSi(OMe)2 Me) as a reductant. The resulting chiral homoallylic alcohols are