Keywords
3-d]pyrimidines.
barbituric acids
benzaldehydes
cascade reactions
furo[2
N-bromosuccinimide
oxidative cyclization
spirotricyclic compounds
tandem Knoevenagel–Michael reaction
Abstract
A new type of chemical one-pot tandem Knoevenagel-Michael reaction followed by the NBS-induced cyclization was discovered. The reaction of aromatic aldehydes with two molecules of N,N'-dimethylbarbituric acid in the presence of NBS in water at ambient temperature affords spirotricyclic furopyrimidine scaffold, namely, 1,5-dihydro-2H,2'H-spiro[furo[2,3-d]pyrimidine-6,5'-pyrimidine]-2,2',4,4',6'-(1'H,3H,3'H)-pentones, in 90-98% yields.
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