Enantioselective sensing of dicarboxylates. Influence of the stoichiometry of the complexes on the sensing mechanism
摘要:
Two new cyclohexane-based thiourea chiral ligands have been synthesized in their enantiomerically pure forms. Both the ability of these ligands in the complexation of chiral dicarboxylates and their sensing properties have been studied. The influence of the stoichiometry of the formed complexes on the fluorescent properties of the systems has been established. The effect of additional substitution in the cyclohexyl moiety was considered by comparing the properties of the newly prepared ligands with those of similar compounds previously described. (C) 2009 Elsevier Ltd. All rights reserved.
A Chiral Thiourea as a Template for Enantioselective Intramolecular [2 + 2] Photocycloaddition Reactions
作者:Florian Mayr、Richard Brimioulle、Thorsten Bach
DOI:10.1021/acs.joc.6b01039
日期:2016.8.19
A chiral (1R,2R)-diaminocyclohexane-derived bisthiourea was found to exhibit a significant asymmetric induction in the intramolecular [2+2] photocycloaddition of 2,3-dihydropyridone-5-carboxylates. Under optimized conditions the reaction was performed with visible light employing 10 mol% thioxanthone as triplet sensitizer. Due to the different electronic properties of its carbonyl oxygen atoms, a directed