Abstract
2-Oxoimidazolidine-1,3-disulfonic acid is a recoverable catalyst for the synthesis of novel triflouromethyl-1H-benzo[f]chromene by the condensation of 2-naphthol, 4,4,4-trifluoro-1-phenyl-1,3-butanedione and different substituted benzaldehyde at room temperature in a one-pot procedure without additional organic solvents. Moreover, the catalyst could be easily recovered and recycled for five runs without significant loss of its catalytic activity. The structures of the synthesized triflouromethyl-1H-benzo[f]chromene compounds were confirmed by 1H, 13C nuclear magnetic resonance and Fourier-transform infrared spectral data and elemental analyses.
Disclosure statement
There is no conflict of interest.
Table 1. Comparison of different catalysts or media for the synthesis of phenyl(1-(p-tolyl)-3-(trifluoromethyl)-1H-benzo[f]chromen-2-yl)methanone (4a) at room temperature.
Table 2. Synthesis of triflouromethyl-1H-benzo[f]chromenes.