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The new and simple ‘LEGO’ system: Its application for the synthesis of 6-oligopyridyl-1,5,12-triazatriphenylenes

✍ Scribed by Gunther R. Pabst; Oliver C. Pfu¨ller; Ju¨rgen Sauer

Publisher
Elsevier Science
Year
1998
Tongue
French
Weight
178 KB
Volume
39
Category
Article
ISSN
0040-4039

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✦ Synopsis

The condensation of 1,10-phenanthroline-5,6-dione 1 with amidrazones 2 leads to 6-hetaryl-substituted 1,2,4,8,9-pentaazatriphenylenes 3. These condensed 1,2,4-triazines can be easily transformed to pyridines by [4+2] cycloaddition with norborna-2,5-diene followed by [4+2] cycloreversions of nitrogen and cyclopentadiene. This reaction sequence offers a new, simple and general access to 6-oligopyddyl-l,5,12-triazatriphenylenes 4.

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The new and simple ‘LEGO’ system: Its ap
The new and simple ‘LEGO’ system: Its application to the synthesis of superbranched oligopyridines
✍ Gunther R. Pabst; Ju¨rgen Sauer 📂 Article 📅 1998 🏛 Elsevier Science 🌐 French ⚖ 192 KB

The condensation of pyridine-2,4,6-tricarboxtrisamidrazone 1 with 1,2-dicarbonyl compounds 2 -3 leads to trisubstituted 1,2,4-triazines 4 -6. These 1,2,4-triazines can be easily transformed to superbranched pyridines 7 -9 by [4+2] cycloaddition with norborna-2,5-diene followed by [4+2] cycloreversio