Modular Synthesis of Di- and Trisubstituted Imidazoles from Ketones and Aldehydes: A Route to Kinase Inhibitors
作者:Ian de Toledo、Thiago A. Grigolo、James M. Bennett、Jonathan M. Elkins、Ronaldo A. Pilli
DOI:10.1021/acs.joc.9b01844
日期:2019.11.1
A one-pot and modular approach to the synthesis of 2,4(5)-disubstituted imidazoles was developed based on ketone oxidation, employing catalytic HBr and DMSO, followed by imidazole condensation with aldehydes. This methodology afforded twenty-nine disubstituted NH-imidazoles (23%-85% yield). A three-step synthesis of 20 kinase inhibitors was achieved by employing this oxidation-condensation protocol
A modular synthesis of functionalised phenols enabled by controlled boron speciation
作者:John J. Molloy、Robert P. Law、James W. B. Fyfe、Ciaran P. Seath、David J. Hirst、Allan J. B. Watson
DOI:10.1039/c5ob00078e
日期:——
two boronic acid derivatives has been developed via one-pot Suzuki–Miyaura cross-coupling, chemoselective control of boron solution speciation to generate a reactive boronic ester in situ, and oxidation. The utility of this method has been further demonstrated by application in the synthesis of drug molecules and components of organic electronics, as well as within iterativecross-coupling.
Liquid crystallinity-embodied imidazolium-based ionic liquids and their chiral mesophases induced by axially chiral tetra-substituted binaphthyl derivatives
作者:Sangbum Ahn、Shohei Yamakawa、Kazuo Akagi
DOI:10.1039/c4tc02968b
日期:——
We synthesised novel imidazolium-based ionicliquids with thermotropic liquid crystallinity by introducing phenylcyclohexyl and/or cyanobiphenyl mesogenic cores and hexyl or dodecyl methine chains into both sites of imidazolium moieties facing bromide anions. The liquid crystalline ionicliquids (LCILs) thus synthesised showed a nematic or smectic mesophase in both the heating and cooling processes
我们通过将苯基环己基和/或氰基联苯介晶核以及己基或十二烷基次甲基链引入面对溴化物阴离子的咪唑部分的两个位点,合成了具有热致液晶性的新型咪唑鎓离子液体。如此合成的液晶离子液体(LCIL)在加热和冷却过程中均显示出向列型或近晶型中间相,表明液晶的对映性。带有相同类型的双介晶核的LCIL [ LCIL-2 ]在115至175°C的温度范围内表现出近晶A相,而具有不同类型的双介晶核的LCIL [ LCIL-3和LCIL-4]显示向列相分别在58至88°C和43至95°C的温度范围内。合成了在双萘基环的2,2',6,6'位置被LC基团取代的轴向手性双萘基衍生物,并用作具有大螺旋扭曲力的手性掺杂剂。LCIL和(R)-和(S)-联萘衍生物的混合物分别表现出具有右旋和左旋螺旋感的诱导手性向列相。LCIL的离子电导率评估为10 -7 –10 -4 S cm -1,取决于各向同性,LC和结晶相。离子电导率的温
Cleavage of C(aryl)−CH
<sub>3</sub>
Bonds in the Absence of Directing Groups under Transition Metal Free Conditions
作者:Peng‐Fei Dai、Xiao‐Shan Ning、Hua Wang、Xian‐Chao Cui、Jie Liu、Jian‐Ping Qu、Yan‐Biao Kang
DOI:10.1002/anie.201901783
日期:2019.4.8
carbon–carbon σ‐bonds, especially for unreactive hydrocarbons, remain limited. Activation by ring strain, directing groups, or in the presence of a carbonyl or a cyano group is usually required. In this work, by using a sequential strategy site‐selective cleavage and borylation of C(aryl)−CH3 bonds has been developed under directing group free and transitionmetalfree conditions. Methyl groups of various arenes