71509-27-8

Upstream product

• 71509-25-6 7-methyl-2-phenyl-pyrazolo[1,5-a]pyrimidine-5-carboxylic acid 
• 5436-21-5 acetylacetaldehyde dimethyl acetal 
• 827-41-8 3-phenylpyrazol-5-amine 
• 71509-24-5 Ethyl 7-methyl-2-phenyl-pyrazolo<1,5-a>pyrimidine-5-carboxylate 
• 71509-22-3 Ethyl 7-methyl-2-phenylpyrazolo<1,5-a>pyrimidine-6-carboxylate 
• 870972-92-2 6-acetyl-7-hydroxy-2-phenylpyrazolo[1,5-a]pyrimidine 
• 42731-40-8 3-oxo-butyraldehyde; sodium (Z)-1-enolate 

Relevant academic research and scientific papers

Recyclization of condensed carbethoxypyrimidines accompanied by substitution of a carbon atom into the heterocycle

Condensation in ethanol of ethyl ethoxymethyleneacetoacetate with systems containing an amidine fragment (substituted 3-aminopyrazoles and 3-amino-1,2,4-triazole) gave 6-carbethoxy-7-methylpyrazolo[1,5-a]pyrimidines. Addition of base to solutions of the o

Synthesis of structurally related purines: Benzimidazo[1,2-a]pyridines, benzimidazo-[1,2-c]pyrimidines, and pyrazolo-[1,5-a]pyrimidines

Reactions of sodium salts of 3-hydroxymethylene-2-alkanones with 2-cyanomethylbenzimidazole afforded benzimidazo[1,2-a]pyridines. Analogues reactions with 2-aminobenzimidazole and 5-aminopyrazoles afforded benzimidazo[1,2-c]pyrimidines and pyrazolo[1-5-a]pyrimidines.