Preference of Ruthenium-Based Metathesis Catalysts toward <i>Z</i>- and <i>E</i>-Alkenes as a Guide for Selective Reactions to Alkene Stereoisomers
作者:Jihong Lee、Kyung Hwan Kim、Ok Suk Lee、Tae-Lim Choi、Hee-Seung Lee、Hyotcherl Ihee、Jeong-Hun Sohn
DOI:10.1021/acs.joc.6b01276
日期:2016.9.2
E-alkene in a metathesis reaction, the relative preference of metathesis Ru catalysts for each stereoisomer was determined by a method using time-dependent fluorescence quenching. We found that Ru-1 prefers the Z-isomer over the E-isomer, whereas Ru-2 prefers the E-isomer over the Z-isomer. The Z/E-alkene preference of the catalysts precisely predicted the Z/E isomeric selectivity in the metathesis reactions
作为在复分解反应中针对Z-或E-烯烃的选择性反应的指南,通过使用时间依赖性荧光猝灭的方法确定了复分解Ru催化剂对每种立体异构体的相对偏好。我们发现,茹-1更喜欢ž在异构体é异构体,而汝2更喜欢Ë异构体在ž异构体。所述ž / Ë催化剂的-烯烃偏好精确预测Ž / é在具有组合二烯基片的复分解反应的异构体选择性ž/ ë烯烃。对于二烯底物,使用Ru-1的反应速率顺序为Z,Z -1,6-二烯> Z,E- 1,6-二烯> E,E- 1,6-二烯,而完全相反在Ru-2的情况下,表现出E,E- 1,6-二烯>Z,E- 1,6-二烯>Z,Z - 1,6-二烯的顺序。