Pteridine-4-carboxylic ester, reaction

Thiazolo[2,3-3]pteridines such as 133 can be prepared by the reaction between 3-aminopyrazine-2-carboxylic esters and 3,4-dihydrothiazoles (Equation 29) <2001JHC1173>. [l,2,4]Triazolo[3,4-A]pteridin-5-ones, 134, can be prepared from 2-thiocarbonylpteridin-4-ones by reaction with hydrazonoyl halides the proposed mechanism is outlined in Scheme 38 <2002MOL494>. 

Pteridine-7-carboxylic acid, 6-oxo-synthesis, 3, 310 Pteridinecarboxylic acids structure, 3, 276-277 Pteridine-4-carboxylic acids ethyl ester hydrolysis, 3, 276 Pteridine-6-carboxylic acids properties, 3, 277 reactions, 3, 304 Pteridine-7-carboxylic acids properties, 3, 277 reactions, 3, 304 Pteridine-6,7-dicarboxylic acid properties, 3, 277 Pteridine-2,4-dione, 7-hydroxy-tautomerism, 3, 271... 

---