Journal of the Chemical Society. Perkin transactions I p. 519 - 524 (1996)
Update date:2022-08-10
Topics:
Barlow, Michael G.
Sibous, Lakhdar
Suliman, Nadia N. E.
Tipping, Anthony E.
Trichloro-1,2,4-triazine reacts with cycloheptene and cyclododecene to give the 2,6-dichloropyridine derivatives 6 and 7 via an intermediate dihydropyridine formed by Diels-Alder addition and loss of N2, and with cyclopenta-1,3-diene and indene by addition of a second molecule of alkene to the intermediate dihydropyridine. Bicyclo[2.2.1]hepta-2,5-diene and quadricyclane give mainly 2,3,6-trichloropyridine by loss of cyclopentadiene from the intermediate dihydropyridine. With hexa-1,5-diene, the dihydropyridine is trapped by an intramolecular Diels-Alder reaction, forming tricyclic compounds 17 and 18. With diallyl ether, the dihydropyridine partly undergoes intramolecular cycloaddition to give 23 and partly [1,5]-sigmatropic shift of hydrogen before intramolecular cycloaddition to give 25. With cyclododeca1,5,9-triene formation of pyridine derivatives is incomplete and the immediate precursor can be trapped with water.
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