685892-69-7

Upstream product

• 685893-92-9 5-hydroxy-1,3-dimethyl-6-nitro-8-phenylpyrido[2,3-d]pyrimidine-2,4,7(1H,3H,8H)-trione 
• 108-24-7 acetic anhydride 

Downstream Products

• 685894-13-7 N-(5-hydroxy-1,3-dimethyl-2,4,7-trioxo-8-phenyl-1,2,3,4,7,8-hexahydropyrido[2,3-d]pyrimidin-6-yl)acetamide 
• 1078574-76-1 6-amino-5-hydroxy-1,3-dimethyl-1,8-phenylpyrido[2,3-d]pyrimidine-2,4,7(1H,3H,8H)-trione hydrochloride 
• 1078574-73-8 6-amino-5-hydroxy-1,3,8-trimethylpyrido[2,3-d]pyrimidine-2,4,7(1H,3H,8H)-trione hydrochloride 

Relevant academic research and scientific papers

Ring closure reactions of pyrido[2,3-d]pyrimidines to pyrano[2′, 3′:4,5]- and oxazolo[5′,4′:4,5]pyrido[2,3-d]pyrimidines

(Chemical Equation Presented) The cyclocondensation of 5-hydroxy-pyrido[2, 3-d]pyrimidines 1 with malonates gives pyrano[2′,3′:4,5]-pyrido[2,3- d]pyrimidines 2. Nitration of 1 and reduction with zinc in the presence of carboxylic acids/anhydrides gave 2-a