Enantioselective Cyanosilylation of Alkynyl Ketones Catalyzed by Combined Systems Consisting of Chiral Ruthenium(II) Complex and Lithium Phenoxide
作者:Takeshi Ohkuma、Nobuhito Kurono、Yusuke Sakaguchi、Kohei Yamauchi、Taiga Yurino
DOI:10.1002/adsc.201701593
日期:2018.4.3
Asymmetric cyanosilylation of alkynyl ketones with the catalyst systems consisting of amino acid/2,2′‐bis(diphenylphosphino)‐1,1′‐binaphthyl (BINAP)/ruthenium(II) complex and lithium phenoxide (Ru⋅Li cat.) was studied. The reaction was conducted in tert‐butyl methyl ether (TBME) at −78 °C with a substrate‐to‐catalyst molar ratio (S/C) as high as 2000. A series of simple and functionalized ketones was converted
炔基酮与氨基酸/ 2,2'-双(二苯基膦基)-1,1'-联萘(BINAP)/钌(II)配合物和苯氧基锂(Ru⋅Licat。)组成的催化剂体系的不对称氰基硅烷化研究过。该反应在−78°C的叔丁基甲基醚(TBME)中进行,底物与催化剂的摩尔比(S / C)高达2000。一系列简单且功能化的酮转化为炔基叔丁基氰醇衍生物含量高达ee的99%。根据基板结构的催化剂的氨基酸配体的适当的选择是极其重要的,以实现高对映选择性和底物的范围广。还检查了手性氰醇产物向官能化内酯的转化。