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Abstract
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Silica-bonded N-propylpiperazine sodium Npropionate
is employed as a recyclable heterogeneous solid
base catalyst for the synthesis of benzopyrano[2,3-
d]pyrimidines through one-pot condensation reaction of
salicylaldehydes, malononitrile, and secondary amines at
room temperature under solvent-free conditions. The catalyst
could be recycled several times without appreciable
loss in catalytic activity.
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