Tetrahedron Letters p. 6691 - 6694 (1998)
Update date:2022-08-29
Topics:
Pabst, Gunther R.
Schmid, Konrad
Sauer, Juergen
The condensation of carboxamidrazones 1 with 1,2-dicarbonyl compounds 2 is the best method for the synthesis of alkyl, aryl or hetaryl substituted 1,2,4-triazines 3 - 7. These 1,2,4-triazines can be easily transformed to pyridines 8 - 12 by [4+2] cycloaddition with bicyclo[2.2.1]hepta-2,5-diene followed by [4+2] cycloreversions of nitrogen and cyclopentadiene. This reaction sequence offers a new, simple and general access to branched oligopyridines.
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