Enol triflates pyrimidines

The reaction of 4-bromobenzaldehyde with substituted acetophenones and urea gave aryl-substituted pyrimidin-2-ones 63 or hexahydro-l//,8//-pyrimido[4,5-rfJpyrimidin-2,7-diones 64, depending on the nature of the acetophenone substituent and the solvent <04CHE194>. Two new approaches to 2,4-dialkylamino-substituted 6,7-dihydro-5//-benzocyclohepta[l,2-c( pyrimidines were developed, one based on the reaction of substituted cyanamides and the enol triflate of 1-benzosuberone, and the other based on nucleophilic displacements at C2 and C4 of... 

Pyrimidines from enol triflates and two nitrile molecules... 

Trimethylsilylpyrimidinium triflate, derived from pyrimidine and trimethylsilyl triflate, adds silylated enol ethers to form 1,4-dihydropyrimidines. /V-Acylpyrimidinium tetrafluoroborates undergo analogous reactions (85H(23)207). 

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