Journal of the Chemical Society. Perkin transactions I p. 1801 - 1806 (1992)
Update date:2022-08-03
Topics:
Sako, Magoichi
Makino, Toru
Kitada, Yukio
Hirota, Kosaku
Maki, Yoshifumi
A comparative study on the photooxidation of 2',3'-O-isopropylideneadenosine 1a and its N6-benzoyl, N-6-monomethyl, and N6,N6-dimethyl derivatives, 1b-d, with a pyrimido<5,4-g>pteridinetetraone N-oxide (PPO) was carried out.The ease of photooxidative consumption of the adenosines by the PPO is in the order 1d > 1c > 1a > 1b, which is parallel to their oxidation-peak potentials.Although substrates 1a and 1b underwent oxidative intramolecular cyclisation to the corresponding 5'-O,8-cycloadenosines, 2a and 2b, even in low yield, substrates 1c and 1d were exclusively oxidised at the N6-methyl group to give the corresponding N6-formyl derivatives, 3 and 4, together with minor amounts of demethylated products, 1a and 1c.The present observations provide chemical evidence for the generation and reactivity of adenosyl cation radicals.
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