A general and convenient route to oxazolyl ligands
摘要:
A diverse range of chiral and achiral oxazolyl ligands, which have many applications including catalysis and luminescent devices, are synthesized simply in three steps from readily available and inexpensive phenol and amino alcohol starting materials. The method can be applied to ligands with electron-donating/-withdrawing and sterically demanding/undemanding substituents, and can conveniently be scaled up to >25 g of product. (C) 2011 Elsevier Ltd. All rights reserved.
A general and convenient route to oxazolyl ligands
摘要:
A diverse range of chiral and achiral oxazolyl ligands, which have many applications including catalysis and luminescent devices, are synthesized simply in three steps from readily available and inexpensive phenol and amino alcohol starting materials. The method can be applied to ligands with electron-donating/-withdrawing and sterically demanding/undemanding substituents, and can conveniently be scaled up to >25 g of product. (C) 2011 Elsevier Ltd. All rights reserved.
[3 + 2]-Cycloaddition of Azaoxyallyl Cations with 1,2-Benzisoxazoles: A Rapid Entry to Oxazolines
作者:Juan Feng、Ming Zhao、Xuanzi Lin
DOI:10.1021/acs.joc.9b01166
日期:2019.8.2
novel and efficient [3 + 2] cycloaddition reaction of azaoxyallyl cations and 1,2-benzisoxazoles to give oxazoline derivatives has been developed. The transformation provides a rapid entry to functionalized oxazoline scaffolds under mild and transition-metal-free conditions, which will greatly expand the reaction types of heterocycle chemistry and pave the way for syntheses of bioactivecompounds.
6-(2-hydroxy-3-methylbenzylamino)purine (PI-55) as the first molecule to antagonize cytokininactivity at the receptor level. Here we report the synthesis and in vitro biological testing of eleven BAP derivatives substituted in the benzyl ring and in the C2, N7 and N9 positions of the purine moiety. The ability of the compounds to interact with Arabidopsis cytokinin receptors AHK3 and CRE1/AHK4 was
Importance of Steric Influences in the Construction of Multicomponent Hybrid Polymetallic Clusters
作者:Ross McLellan、Maria A. Palacios、Sergio Sanz、Euan K. Brechin、Scott J. Dalgarno
DOI:10.1021/acs.inorgchem.7b01566
日期:2017.8.21
of the methyl or ethyl group. The distortion of the cluster core is consequently enhanced, switching the magnetic properties and resulting in single-molecule magnet behavior. The presence of tert-butylgroups at the 3- and 5-positions of the salicylaldoxime skeleton leads to a new [MnIV2MnIII2] cluster that is found to be a single-molecule magnet. The bulky tert-butylgroup in the 3-position is too
混合多金属锰簇的简单室温合成进行了研究,开发的互补配体组合p -叔-butylcalix [4]芳烃和水杨醛肟。已经制备了八种新的[Mn III 7 Mn II ]簇,其中在水杨醛肟支架的明确定义的位置上简单取代烷基或芳基会导致两种不同的结构类型,这些结构类型虽然表现出相同的一般拓扑,但仍包含唯一的Mn II离子在不同的位置。在芳族骨架的3位上掺入甲基,乙基或异丙基,或在肟基碳上掺入苯基,可得到A型结构,显示出竞争性的弱铁磁和反铁磁相互作用。在肟基碳原子上取代甲基或乙基会产生结构类型B,由于甲基或乙基的空间位错和位置较小,因此在金属核中引入了额外的块状氯化物或硝酸盐。因此,簇状磁芯的畸变得到增强,从而改变了磁性能并导致了单分子磁体的行为。在水杨醛肟骨架的3位和5位上存在叔丁基会导致新的[Mn IV 2 MnIII 2 ]团簇,发现它是单分子磁体。在3-位的庞大的叔丁基基团太大而不能促进Mn