Enantiomerically pure chiral phenazino-crown ethers: synthesis, preliminary circular dichroism spectroscopic studies and complexes with the enantiomers of 1-arethyl ammonium salts
Enantiomerically pure chiral crown ethers containing the phenazine unit [(R,R)-2–(S,S)-8] were prepared by two types of cyclization reactions. Ligands (R,R)-2, (R,R)-3, (S,S)-4, (R,R)-5, (R,R)-6 and (R,R)-7 were prepared from phenazine-1,9-diol 9 and the appropriate ditosylates (S,S)-10–(S,S)-15 in weak basic conditions with complete inversion of configuration. Ligands (S,S)-2, (S,S)-7 and (S,S)-8
Synthesis of new enantiopure dimethyl- and diisobutyl -substituted pyridino-18-crown-6 ethers containing a halogen atom or a methoxy group at position 4 of the pyridine ring for enantiomeric recognition studies
Newenantiomerically pure dimethyl- and diisobutyl-substituted pyridino-18-crown-6etherscontaining a halogen atom or a methoxy group at position4 of the pyridinering [(S,S)-1, (S,S)-2, (S,S)-3, (S,S)-4] have been synthesized. A new synthetic route and the solid state structure of the reported enantiopuredimethyl-substitutedpyridino-18-crown-6ether [(S,S)-5] containing a chlorine atom at position
Synthesis and optical characterization of novel enantiopure BODIPY linked azacrown ethers as potential fluorescent chemosensors
作者:Ildikó Móczár、Péter Huszthy、Zita Maidics、Mihály Kádár、Klára Tóth
DOI:10.1016/j.tet.2009.07.061
日期:2009.9
Two novel enantiopure BODIPY linked azacrown ether chemosensors were prepared by reacting 3-chloro-5-methoxyBODIPY with new enantiopure monoaza-18-crown-6 ether ligands bearing two methyl and isobutyl groups on their chiral centres, respectively. The latter compounds were synthesized starting from optically active tetraethylene glycols in six steps. The operation of chemosensors is based on the intramolecular
通过使3-氯-5-甲氧基BODIPY与分别在其手性中心带有两个甲基和异丁基的新对映纯单氮杂-18-冠-6醚配体反应,制备了两种新型对映纯BODIPY连接的氮杂冠醚化学传感器。从光学活性的四甘醇开始,以六个步骤合成了后面的化合物。化学传感器的操作基于分子内电荷转移(ICT)过程。它们对某些金属离子和手性伯芳烷基铵离子,特别是对Ca 2+和Pb 2+表现出明显的“开-关”型荧光响应。即使在Ca 2+和Pb 2+的比例为1:1的情况下离子进入离子载体,荧光强度和量子产率值增加了10倍以上,并且在乙腈中吸收带和发射带都蓝移了约20–30 nm(色变效应)。相对稳定的配合物的形成允许通过摩尔比方法确定log K s值。
Enantiomerically pure chiral pyridino-crown ethers: synthesis and enantioselectivity toward the enantiomers of α-(1-naphthyl)ethylammonium perchlorate
Seven new enantiomerically pure chiral pyridino-crown ethers (S,S)-4-(R,R)-10 were prepared. Three of them [(S,S)-4, (S,S)-7 and (R,R)-10] contain one, and two of them [(S,S)-5 and (S,S)-8] contain two linker chains with a terminal double bond. These linker chains were connected to the carbon atom at position 9 (opposite the pyridine moiety) of the macrocycle. The terminal double bond of the linker makes it possible to attach these ligands to silica gel to obtain chiral stationary phases (CSPs). The enantioselectivity of the new ligands toward the enantiomers of alpha-(1-naphthyl)ethylammonium perchlorate (NEA) was also determined by a titration H-1 NMR method. (C) 1999 Elsevier Science Ltd. All rights reserved.