N-Alkyl oxazolidines as stereocontrol elements in asymmetric Diels–Alder cycloadditions of 9-substituted anthracene derivatives

Novel anthracene-based fluorescent sensor for selective recognition of acetate anions in protic media

Novel 9-substituted anthracene derivatives were synthesized and characterized by IR, HRMS, (1)H and (13)C NMR. The fluorescence titration experiments were explored to study the interaction between the compounds and some anions, such as H2PO4(-), P2O7(4-), F(-), Cl(-), Br(-), I(-), AcO(-) in H2O (0.01 M HEPES, pH=7.4) under imitated physiological conditions. One of these compounds, bearing a phenylalaninol unit, showed specific fluorescence enhancement with acetate anion. The sensor L1 was found to present good selective fluorescence sensing ability to acetate anion through photoinduced electron-transfer mechanism in protic media.

17-Hydroxy-1,8-dimethyl-17-azapentacyclo[6.6.5.02,7.09,14.015,19]nonadeca-2,4,6,9(14),10,12-hexaene-16,18-dione

In the title compound, C₂₀H₁₇NO₃ (alternative name: N-hy­droxy-9,10-dimethyl-9,10-ethano­anthracene-11,12-dicarboximide), the rigid ethano­anthracene-dicarboximide moiety has a roof-shaped geometry, the inter­planar angle between the two terminal phenyl rings being 124.9 (6)°. In the crystal, mol­ecules are linked via O—H⋯O hydrogen bonds, forming chains along [010]. C—H⋯O and C—H⋯π inter­actions link adjacent chains, leading to the formation of a three-dimensional structure.