Nine 3,3’-(arylmethylene)bis(2-hydroxynaphthalene-1,4-dione) derivatives were synthesized through the reaction between 2-hydroxy-1,4-naphthalen-1,4-dione and different aromatic alde-hydes in water applying ultrasonic...Nine 3,3’-(arylmethylene)bis(2-hydroxynaphthalene-1,4-dione) derivatives were synthesized through the reaction between 2-hydroxy-1,4-naphthalen-1,4-dione and different aromatic alde-hydes in water applying ultrasonic irradiation for 5 min at room temperature and microwave irradiation for 15 min at 70°;C. Two of the nine derivatives, compounds 3-e and 3-i, obtained from 3-bromo-hydroxybenzaldehyde and 5-methylfuran-2-carbaldehyde, respectively, are previously unpublished. The structures of all compounds were established on the basis of their spectral data and mass analysis. The attractive features of this synthesis protocol include mild conditions, high atom-economy and excellent yields with the elimination of water as the only by-product.展开更多
Various xanthenes have been synthesized by the condensation ofβ-naphthol,2-hydroxynaphthalene-1,4-dione or dimedone with various aldehydes in the presence of trifluoroacetic acid as catalyst in 1,1,3,3-N,N,N′,N′-te...Various xanthenes have been synthesized by the condensation ofβ-naphthol,2-hydroxynaphthalene-1,4-dione or dimedone with various aldehydes in the presence of trifluoroacetic acid as catalyst in 1,1,3,3-N,N,N′,N′-tetramethylguanidinium trifluoroacetate （TMGT） ionic liquid within 1 h at 75℃.展开更多
A simple and efficient protocol has been developed for the synthesis of 3-phenylnaphtho[2,3-b]furan-4,9-diones by domino reaction of a-bromonitroalkenes to 2-hydroxynaphthalene-1,4-dione. With the optimal reaction con...A simple and efficient protocol has been developed for the synthesis of 3-phenylnaphtho[2,3-b]furan-4,9-diones by domino reaction of a-bromonitroalkenes to 2-hydroxynaphthalene-1,4-dione. With the optimal reaction condi- tions [NaOAc （120 mol%）, water, 70 ~C, 7 h], the scope of the domino reaction was explored and the green ap- proach provided the desired products in moderate to good yields at elevated temperature under aqueous-mediated conditions. A mechanistic rationalization for this reaction is also provided. The absorption characteristics of the compounds were examined by UV-Vis spectra and fluorescence spectroscopy. All compounds were fluorescent in solution emitting at blue light （432--433 nm）, green light （512--536 nm）, or yellow light （591 nm）.展开更多
文摘Nine 3,3’-(arylmethylene)bis(2-hydroxynaphthalene-1,4-dione) derivatives were synthesized through the reaction between 2-hydroxy-1,4-naphthalen-1,4-dione and different aromatic alde-hydes in water applying ultrasonic irradiation for 5 min at room temperature and microwave irradiation for 15 min at 70°;C. Two of the nine derivatives, compounds 3-e and 3-i, obtained from 3-bromo-hydroxybenzaldehyde and 5-methylfuran-2-carbaldehyde, respectively, are previously unpublished. The structures of all compounds were established on the basis of their spectral data and mass analysis. The attractive features of this synthesis protocol include mild conditions, high atom-economy and excellent yields with the elimination of water as the only by-product.
基金the financial support of the Research Council of the University of Isfahan.
文摘Various xanthenes have been synthesized by the condensation ofβ-naphthol,2-hydroxynaphthalene-1,4-dione or dimedone with various aldehydes in the presence of trifluoroacetic acid as catalyst in 1,1,3,3-N,N,N′,N′-tetramethylguanidinium trifluoroacetate （TMGT） ionic liquid within 1 h at 75℃.
文摘A simple and efficient protocol has been developed for the synthesis of 3-phenylnaphtho[2,3-b]furan-4,9-diones by domino reaction of a-bromonitroalkenes to 2-hydroxynaphthalene-1,4-dione. With the optimal reaction condi- tions [NaOAc （120 mol%）, water, 70 ~C, 7 h], the scope of the domino reaction was explored and the green ap- proach provided the desired products in moderate to good yields at elevated temperature under aqueous-mediated conditions. A mechanistic rationalization for this reaction is also provided. The absorption characteristics of the compounds were examined by UV-Vis spectra and fluorescence spectroscopy. All compounds were fluorescent in solution emitting at blue light （432--433 nm）, green light （512--536 nm）, or yellow light （591 nm）.
