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Synthesis of Pyrido[2,3-d]pyrimidines via Palladium-catalyzed Coupling Reaction Followed by Electrocyclic Reaction

โœ Scribed by Hoon Kim, Sung; Yoon Rho, Kee; Hyup Kim, Joong; Min Yoon, Cheol

Book ID
124158250
Publisher
Japan Institute of Heterocyclic Chemistry
Year
1998
Tongue
English
Weight
185 KB
Volume
48
Category
Article
ISSN
0385-5414

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## Synthesis of Pyrido[2, pyrimidines via Palladium-Catalyzed Coupling Reaction Followed by Electrocyclic Reaction. -An efficient synthetic route to the title pyridopyrimidines [cf. (VI), (VIII)/(IX), (XI)/(XII)] via Pd-catalyzed coupling of easily achieved 5-iodo-6aminomethyleneaminouracil (IV

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The reactions of iodouracils having a formamidine or acetamidine moiety 1 with various acetylenes 2 in DMF at 120 C using potassium carbonate and a catalytic amount of palladium acetate gave a mixture of pyrido [2,3-d]pyrimidine derivatives in good to high yields. Addition of lithium chloride to the