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Synthèse des pyrido[2,3-d] el [3,2-d] -s-triazolo[3,4-f] pyrimidines el de (pyrazolyl-1')-4 pyrido[2,3-d] et [3,2-d] pyrimidines

✍ Scribed by MM. L. Codefroy; G. Queguiner; P. Pastour

Book ID
112123097
Publisher
Journal of Heterocyclic Chemistry
Year
1973
Tongue
English
Weight
66 KB
Volume
10
Category
Article
ISSN
0022-152X

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Reactions of Uracils, Some Aspects of th
Reactions of Uracils, Some Aspects of the Chemistry of Pyrido[2,3-d]pyrimidines. A Novels-Triazolo[4′,3′:1,6]pyrido[2,3-d]pyrimidine
✍ Mátyus, Péter ;Sohár, Pál ;Wamhoff, Heinrich 📂 Article 📅 1984 🏛 John Wiley and Sons 🌐 English ⚖ 453 KB

## Abstract The novel 7‐hydrazino‐1,3‐dimethylpyrido[2,3‐__d__]pyrimidine‐2,4(1__H__,3__H__)‐dione (**2**) gives the hydrazine derivatives **3, 5, 6, 8**, and **10**. The __s__‐triazolo[4′,3′: 1,6]pyrido[2,3‐__d__]pyrimidine **4** is prepared from **3**, while the attempted cyclizations of **5, 6**

Ring closure reactions of pyrido[2,3-d]p
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
✍ Dang Van Tinh; Wolfgang Stadlbauer 📂 Article 📅 2008 🏛 Journal of Heterocyclic Chemistry 🌐 English ⚖ 419 KB

## Abstract magnified image 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‐alkyloxazolo[5′,4′:4,5]pyrid