Alkynyl Moiety for Triggering 1,2‐Metallate Shifts: Enantiospecific sp
<sup>2</sup>
–sp
<sup>3</sup>
Coupling of Boronic Esters with
<i>p</i>
‐Arylacetylenes
作者:Venkataraman Ganesh、Marcin Odachowski、Varinder K. Aggarwal
DOI:10.1002/anie.201703894
日期:2017.8.7
The enantiospecific coupling of secondary and tertiary boronic esters to aromatics has been investigated. Using p-lithiated phenylacetylenes and a range of boronic esters coupling has been achieved by the addition of N-bromosuccinimide (NBS). The alkyne functionality of the intermediate boronate complex reacts with NBS triggering the 1,2-migration of the group on boron to carbon giving a dearomatized
Effect of extended conjugation with a phenylethynyl group on the fluorescence properties of water-soluble arylboronic acids
作者:Shi-Long Zheng、Na Lin、Suazette Reid、Binghe Wang
DOI:10.1016/j.tet.2007.04.035
日期:2007.6
Boronic acids that change fluorescent properties upon sugar binding are very important reporter units for the development of small molecule lectin mimics (boronolectins). Aimed at developing long wavelength fluorescent boronic acid reporter compounds, we have designed and synthesized a series of boronic acid analogs 2a-d with an extended pi conjugation. Such designs are based on earlier fluorescent
在糖结合时改变荧光特性的硼酸是开发小分子凝集素模拟物(硼凝集素)的非常重要的报告单位。为了开发长波长荧光硼酸报告化合物,我们设计并合成了一系列具有扩展 pi 共轭的硼酸类似物 2a-d。此类设计基于较早的荧光硼酸,其在糖结合时会改变荧光特性。与相应的母体生色团相比,这些具有扩展共轭的新化合物显示出更长的激发和发射波长。新化合物的荧光变化模式也与相应的母体化合物不同。
Microwave-assisted synthesis of ethynylarylboronates for the construction of boronic acid-based fluorescent sensors for carbohydrates
作者:Shi-Long Zheng、Suazette Reid、Na Lin、Binghe Wang
DOI:10.1016/j.tetlet.2006.02.012
日期:2006.4
A reliable and operationally simple procedure for the synthesis of 2.2-dimethylpropane-1,3-diyl ethynylaryl boronates 4 was developed. The key step is microwave-facilitated selective formation of 2,2-dimethylpropane-1,3-diyl trimethylsilylethynylaryl boronates by Sonogashira reaction front the corresponding bromides. The use of microwave was found to significantly improve the reaction yield and shorten the reaction time. The 2,2-dimethylpropane-1,3-diyl ethynylaryl boronates 4 prepared can be used in the construction of diboronic acid libraries through [2+3] Huisgen cycloaddition for carbohydrate fluorescent sensor development. (c) 2006 Elsevier Ltd. All rights reserved.