ompg-C3N4/SO3H organocatalyst-mediated green synthesis of 1,2-dihydro-1-arylnaphtho[1,2-e][1,3] oxazin-3-ones under solvent-free and mild conditions: a fast and facile one-pot three-component approach

摘要

In this research, we have described the synthesis of the well-ordered mesoporous graphite carbon nitride (ompg-C3N4) by applying SBA-15 as a potential hard silica template, and the catalytic performance of sulfonated well-ordered mesoporous graphite carbon nitride (ompg-C3N4/SO3H) as an environment-friendly and efficient polymeric solid acid catalyst was investigated in the one-pot preparation of 1,2-dihydro-1-arylnaphtho[1,2-e][1,3]oxazin-3-ones. This cyclocondensation reaction was performed in the presence of various substituted aldehydes, urea, and 2-naphthol through mild and efficient solvent-free method. The structure and morphology of ompg-C3N4/SO3H were characterized using various instrumental analysis methods including FT-IR, EDS, FESEM, TEM, TGA, DTG, XRD, and BET. The simplicity of the process, low reaction times, simple workup, high to quantitative yields, avoiding the utilization of organic solvents, and reusability of the as-prepared catalyst are several prominent advantages of this present synthetic method.