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Cuprous iodide has been found to be a very effective catalyst for allylation of aldehydes with allyltributylstannane. The catalytic system efficiently promotes the allylation reaction in DMF to produce homoallylic alcohols in high yield.
An improved protocol for the Biginelli reaction using CuI as a reusable catalyst is described. The synthesis of 3,4-dihydropyrimidin-2(1H)-ones was achieved in acetonitrile, water and under solvent-free condition. After separation of product from the reaction mixture, the mother liquor (acetonitrile or water) containing the catalyst was reused two times without any loss of activity.
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