通常,空间正交轨道之间的远程电子通信效率低下,并且仅限于场和感应效应。在这项工作中,我们提供了实验证据,表明可以通过两个简并且相互正交的前沿分子轨道 (MO) 在过渡态的分子内电子转移来实现这种通信。当这些轨道之间的能隙接近零或“轨道交叉”时,正交轨道之间的相互作用被放大。两个空的或两个完全占据的 MO 之间的交叉不会导致稳定,当一个空的 MO 被填充(即电子注入)或填充的 MO 之一被减少(即空穴注入)时,可以“激活” )。在还原环芳构化反应中,这种交叉定义了具有由面内和面外 π 系统定义的能量的过渡态。在此,我们使用轨道交叉在烯二炔的还原性 C1-C5 环芳构化反应中为该概念的实用性提供了实验证据。与类似的自由基环化相比,通过轨道交叉与远程取代基的通信大大提高了闭环步骤的区域选择性。我们还提供了与电子注入苄基化烯二炔的效率有关的光物理数据。与类似的自由基环化相比,通过轨道交叉与远程取代
通常,空间正交轨道之间的远程电子通信效率低下,并且仅限于场和感应效应。在这项工作中,我们提供了实验证据,表明可以通过两个简并且相互正交的前沿分子轨道 (MO) 在过渡态的分子内电子转移来实现这种通信。当这些轨道之间的能隙接近零或“轨道交叉”时,正交轨道之间的相互作用被放大。两个空的或两个完全占据的 MO 之间的交叉不会导致稳定,当一个空的 MO 被填充(即电子注入)或填充的 MO 之一被减少(即空穴注入)时,可以“激活” )。在还原环芳构化反应中,这种交叉定义了具有由面内和面外 π 系统定义的能量的过渡态。在此,我们使用轨道交叉在烯二炔的还原性 C1-C5 环芳构化反应中为该概念的实用性提供了实验证据。与类似的自由基环化相比,通过轨道交叉与远程取代基的通信大大提高了闭环步骤的区域选择性。我们还提供了与电子注入苄基化烯二炔的效率有关的光物理数据。与类似的自由基环化相比,通过轨道交叉与远程取代
The present invention relates to HSP90 inhibitors containing fused amino pyridine core that are useful as inhibitors of HSP90 and their use in the treatment of HSP90 related diseases and disorders such as cancer, an autoimmune disease, or a neurodegenerative disease.
Magnesiation ortho to boron: Borylbenzenes with an N‐methyl‐1,3‐ethylenediamino group on the boron atom undergo ortho‐magnesiation upon exposure to 2,2,6,6‐tetramethylpiperidide (TMP)2Mg, and the resulting ortho‐magnesiated borylbenzenes can be trapped with electrophiles (see scheme).
This invention is concerned with compounds of the formula I:
wherein one of R
5
, R
6
and R
7
is
and X
1
, X
2
, R
1
to R
12
, m, n and o are as defined in the description, and pharmaceutically acceptable salts and/or esters thereof. The invention further relates to pharmaceutical compositions containing such compounds, to a process for their preparation and to their use for the treatment and/or prevention of diseases which are modulated by PPARδ and/or PPARα agonists.
A chemo- and regioselective Pd(0)-catalyzed spiroannulation has been successfully developed. The key feature of this method is the use of readily available 1,2-dihaloarenes, alkynes and 2-naphthols for the rapid assembly of spirocarbocyclic molecules. Mechanistic studies revealed that this domino reaction proceeded through a cascade of oxidative addition to Pd(0), alkyne migratory insertion, and 2
Facile, One-Pot, and Gram-Scale Synthesis of 3,4,5-Triiodoanisole through a C-H Iodination/<i>ipso</i>-Iododecarboxylation Strategy: Potential Application towards 3,4,5-Trisubstituted Anisoles
作者:Raed M. Al-Zoubi、Hussein Al-Mughaid、Mariam A. Al-Zoubi、Khaled T. Jaradat、Robert McDonald
DOI:10.1002/ejoc.201500887
日期:2015.9
through a one-pot C–H iodination/ipso-iododecarboxylation reaction was investigated. Commercially available benzoic acid was used, which allowed the reaction to be performed on a multigram scale in good yield. This report discloses a practical method for the one-potsynthesis of hitherto unknown 3,4,5-triiodoanisole that is catalytic, scalable, efficient, and easy to work up and purify. Potential application