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A pseudo four-component reaction is described, leading to the efficient regioselective synthesis of σ symmetric spiro heterobicyclic rings using aldehydes and urea in the presence of cyclic β-diester or β-diamides such as Meldrum's acid or barbituric acid derivatives. The reaction needs no added catalyst and proceeds solvent-free conditions at 80 °C.
A novel four-component reaction approach to the efficient synthesis of triamide and amidodiester derivatives using amines or alcohols, aldehydes and alkyl or aryl isocyanides in the presence of Meldrum's acid as a CH acid, instead of carboxylic acid of Ugi four-component reaction, was studied.
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