Abstract
Abstract A simple, efficient, and environmentally benign method for the synthesis of 4 H -chromene derivatives was developed using well ordered and recoverable amino functionalized silica gel as a base catalyst. The 4 H -chromene derivatives were obtained in short time and excellent yield (87%–96%) by three component reaction of aldehydes, malononitrile and cyclic 1,3-diketones in water at 70 °C.
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