ABSTRACT
Titanium aminophospates have been used as catalysts in the synthesis of xanthenediones at room temperature. Among the three catalysts tested, titanium n-propyl aminophosphate (TNPAP) was found to be more efficient catalyst for the synthesis of xanthenediones. The solvent-screening studies for this catalytic reaction reveals that MeOH: H2O was the most suitable solvent system, yielding higher amounts (89%) of products. The TNPAP catalyst was found to be reusable for five successive cycles. The optimized reaction conditions are 1.0 mmol of benzaldehyde, 2.0 mmol of dimedone, methanol/water (5.0 mL) as solvent, rt, and 100 mg of TNPAP. A plausible mechanism for the catalytic reactions has been proposed.
GRAPHICAL ABSTRACT
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