Photochemical intramolecular cyclisation of purine and pyrimidine nucleosides induced by an electron acceptor

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Abstract
Irradiation of appropriately protected purine nucleosides (guanosine and adenosine)(1) and cytidine (2a) in the presence of pyrimido[5,4-g]pteridine N-oxide (5) with u.v.–visible light results in the exclusive formation of the corresponding 5′-O,8-cyclopurine nucleosides (3) and 5′-O,6-cyclocytidine (4a).

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