The present study offered an introduction of horsetail plant with its unique properties. It is a source of silica and is reported to contain active components such as phenolic acids (e.g., ascorbic acids, ferulic acids, silicilic acids, malic acids, caffeic acids, gallic acids, pectic acids and tannic acids), saponins,flavonoids, and it also contains minerals such as silicon and silicates, potassium, calcium, aluminum, sulfur, magnesium, manganese, zinc, chrome and cobalt [1]. The exposure of horsetail to a high temperature resulted in the production of the horsetail ash containing better properties and benefits rather than the horsetail itself.One of the most common MCRs that produces an interesting class of oxygen heterocyclic compounds is 2-amino-4H-chromene derivatives synthesis, having attractive harmacological and biological activities, such as antitumor [2]. The results have shown that both horsetail nd horsetail ash could act as bench top solid acid catalytic systems. Therefore, in order to make a omparison between their catalytic activities they were each employed for the first time in the organic reaction to synthesize the 2-Amino-4H-Chromene derivatives from the reaction of dimedone , malononitrile 2 and aromatic aldehydes3under solvent-free conditions (Fig. 1).

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