A new and efficient method for the synthesis of 1,8-dioxo-9-aryl-decahydroacridine derivatives was developed via a one-pot three component reaction of dimedone, aromatic aldehydes and ammonium acetate in the presence of ammonium chloride, or Zn(OAc) 2 •2H 2 O or L-proline separately in water in the short period of time and high yields.
The one-pot three-component reaction of 2-aminobenzothiazole, benzaldehyde derivatives and <i>β</i>-ketoester, <i>β</i>-diketone or malonate derivatives in solvent-free conditions provides the corresponding pyrimido [2,1-<i>b</i>] benzothiazole derivatives at 60?C in 60% - 72% yields without using any catalyst in an optimistic time
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