Intramolecular radical cyclisations to pyridines

Harrowven, D.C., Sutton, B.J. and Coulton, S. (2001) Intramolecular radical cyclisations to pyridines Tetrahedron Letters, 42, (51), pp. 9061-9064. (doi:10.1016/S0040-4039(01)01937-2).


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Intramolecular radical additions to the alpha-, beta- and gamma -carbons of a pyridine have each been shown to be facile processes. When a cis-alkene conjoins an ortho-iodoarene and a pyridine. radical cyclisation induced by homolysis of the carbon to iodine bond favours a 6-exo, endo-trig course. With a two carbon alkane conjoining the ortho-iodoarene and the pyridine, intermolecular hydrogen atom abstraction. 6-exo/endo-trig cyclisation and 5-exo-trig cyclisation modes compete. That the spirocyclic intermediates formed in the 5-exo-trig cyclisation rearrange with migration of the alkyl chain is noteworthy.

Item Type: Article
Digital Object Identifier (DOI): doi:10.1016/S0040-4039(01)01937-2
ISSNs: 0040-4039 (print)
Keywords: radicals and radical reactions, pyridines, nitrogen heterocycles, cascade reactionscondensed thiophenes, toddaquinoline, substitution, rings
ePrint ID: 19508
Date :
Date Event
17 December 2001Published
Date Deposited: 14 Feb 2006
Last Modified: 16 Apr 2017 23:02
Further Information:Google Scholar

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