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Synthesis of 5H-1, 2-dihydro-2, 5-dioxochromeno [2,3-b] pyridines

✍ Scribed by Sh. M. Glozman; V. A. Zagorevskii; L. A. Zhmurenko

Book ID
112343380
Publisher
Springer US
Year
1970
Tongue
English
Weight
176 KB
Volume
6
Category
Article
ISSN
0009-3122

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## Abstract The highly reactive 1 : 1 intermediate generated in the reaction between dialkyl acetylenedicarboxylate (=but‐2‐ynedioic acid dialkyl ester) **4** and triphenylphosphine was trapped by 2‐amino‐4‐oxo‐4__H__‐1‐benzopyran‐3‐carboxaldehydes **5** to yield highly functionalized dialkyl‐1,5‐d