Enantioselective Folding of Enynes by Gold(I) Catalysts with a Remote <i>C</i><sub>2</sub>-Chiral Element
作者:Giuseppe Zuccarello、Joan G. Mayans、Imma Escofet、Dagmar Scharnagel、Mariia S. Kirillova、Alba H. Pérez-Jimeno、Pilar Calleja、Jordan R. Boothe、Antonio M. Echavarren
DOI:10.1021/jacs.9b06326
日期:2019.7.31
Chiral gold(I) catalysts have been designed based on a modified JohnPhos ligand with a distal C2-2,5-diarylpyrrolidine that creates a tight binding cavity. The C2-chiral element is close to where the C-C bond formation takes place in cyclizations of 1,6-enynes. These chiral mononuclear catalysts have been applied for the enantioselective 5-exo-dig and 6-endo-dig cyclization of different 1,6-enynes
手性金 (I) 催化剂的设计基于改良的 JohnPhos 配体,带有远端 C2-2,5-二芳基吡咯烷,可产生紧密结合的空腔。C2-手性元素靠近 1,6-烯炔环化中 CC 键形成的位置。这些手性单核催化剂已应用于不同 1,6-烯炔的对映选择性 5-exo-dig 和 6-endo-dig 环化,以及天然产物 carexane 家族三个成员的首次对映选择性全合成。在看似类似的 1,6-烯炔反应中已经实现了相反的对映选择性,这是由基于有吸引力的芳基-芳基相互作用的底物不同手性折叠引起的。