Tetrahedron Letters p. 6687 - 6690 (1998)
Update date:2022-08-16
Topics:
Pabst, Gunther R.
Sauer, Juergen
The condensation of α-arylglyoxals with carboxamidrazones 1 - 2 is the best method for the synthesis of aryl or hetaryl substituted 1,2,4-triazines 3 - 4. These 1,2,4-triazines can be easily transformed to pyridines 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 2,6-oligopyridines 8 - 11.
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