ISOLATION OF NEW CHLORINATED REGIOISOMERS OF MONO N-SUBSTITUTED URACIL DERIVATIVES AND SYNTHESIS OF 3-SUBSTITUTED 8-PHENYLPYRIMIDO-1,2,4-TRIAZINE-5,7(6H,8H)-DIONES

Article abstract of DOI:10.3987/COM-93-S146

A variety of fervenulin type products, 3-substituted 8-phenylpyrimido<5,4-e>-1,2,4-triazine-5,7(6H,8H)-diones (18a-i), were synthesized by nitrosative or nitrative cyclization of the aldehyde hydrazones (17a-i) derived from 6-(1-methylhydrazino)-1-phenyluracil (16) with aliphatic as well as aromatic aldehydes.The compound (16) was prepared by the reaction of 6-chloro-1-phenyluracil (8) with methylhydrazine.In addition, not only the precursor of 16, 6-chloro-1-phenyluracil (8), but also other new chlorinated regioisomers of mono N-substituted pyrimidine (9) and uracil (14) were isolated and characterized by the reductive dechlorination of them.