报道了三种新的三联苯配体锂衍生物的合成,光谱学和结构表征。这些是混合锂烷基锂芳基化合物{李(吨-Bu)LIC 6 ħ 3 -2,6-旅行2 }(1,跳闸= C 6 H ^ 2 -2,4,6-我-Pr 3) ,二锂化的{LiC 6 H 3 -2-(C 6 H 3 -2-Me-5- t -Bu)-6-(C 6 H 3 -2-CH 2 Li-5- t -Bu)·Et 2 O} 2(2),然后醚化(Et 2 O)LiC 6 H 3 -2,6-(C 6 H 4 -4- t -Bu)2(3)。还给出了2和3的三卤代三苯醚前体的合成。化合物1是由在己烷中用两当量的Li(t- Bu)处理1-IC 6 H 3 -2,6-Trip产生的。它具有由两个锂离子桥接的烷基和芳基(三苯基)基团。锂离子进一步被叔芳基的邻芳基取代基和甲基溶剂化-Bu团体。这种化合物是烷基锂-锂芳基化合物混合的非常罕见的例子。通过用两当量的Li(t
We reported a highly effective Pd-catalytic system for the synthesis of diarylbenzenes through Suzuki-type reactionbetween equal amount of diiodoarenes and arylboronicacids. This preferential oxidative addition resulted in such high selectivity.
Spatial Anion Control on Palladium for Mild C–H Arylation of Arenes
作者:Jyoti Dhankhar、Elisa González-Fernández、Chao-Chen Dong、Tufan K. Mukhopadhyay、Anthony Linden、Ilija Čorić
DOI:10.1021/jacs.0c09611
日期:2020.11.11
C-H arylation of arenes without the use of directing groups is a challenge, even for simple molecules, such as benzene. We describe spatial anion control as a concept for the design of catalytic sites for C-H bond activation, thereby enabling nondirected C-H arylation of arenes at ambient temperature. The mild conditions enable late-stage structural diversification of biologically relevant small molecules
Iterative Synthesis of 1,3,5-Polyphenylene Dendrons via C−H Activation
作者:Aaron D. Finke、Jeffrey S. Moore
DOI:10.1021/ol8019605
日期:2008.11.6
An iterative synthesis of 1,3,5-polyphenylene dendrons via C-H activation/Suzuki-Miyauracoupling up to a third generation dendron is described. C-H bonds at the focal points of the dendrons are selectively borylated via iridium-catalyzed borylation, eliminating the need for reactive protecting groups. Sequential additions of low catalyst loadings efficiently borylate higher-generation dendrons, whereas