5 step process for preparing certain 2,4-diamino-5-pyrimidine-su

5,5-dichloro-4,5-dihydro-6-hydroxy-2-trichloromethylpyrimidin-4-

5,5-Difluorouracil

5,6,7,8-Tetrahydrotriazolo{4,3-alpha}-pyridin-3(2H)-ones

5,6-dialkoxy-4-imino-2(1H)quinazolinone derivatives

5,8-Dihydro-6H-pyrido[2,3-d]pyrimidin-7-ones

5-(1-fluoro-vinyl)-1H-pyrimidine-2,4-dione derivatives useful as

5-(4-Amino or acylaminophenyl)-2(1H)-pyrazinones having inotropi

5-(4-amino-3,5-dimethoxyphenyl)-5-hydroxy-barbituric acid

5-(4-Nitrophenyl)-2(1H)-pyrazinones

5-(Phenyl or benzyl amino)methyl-pyrrolo[2,3-d]pyrimidin-4-one

5-(Substituted benzyl)-6-oxo-2-piperazine carboxylic acids and e

5-Alkylsulphonyl- and 5-alkenylsulphonylbarbituric acids and der

5-Amino-2,8-dialkyl-7,8-dihydro-7-oxo-pyrido-[2,3-d]pyrimidine-6

5-Aminomethyl-2,3-dihydro-2-oxo-1H-imidazole-4-carboxylic acid d

5-arylindole derivatives

5-Chloro-7,8-dihydro-7-oxo-pyrido[2,3-d]pyrimidine-6-carboxylic

5-cyano-2-aminopyrimidine derivatives

5-deaza-10-oxo-and 5-deaza-10-thio-5,6,7,8-tetrahydrofolic acids

5-fluoro-3,4-dihydro-2,4-dioxo-N-(3-indolyl)-1(2H)-pyrimidinecar