CH2 H7¢), 4.20 (t, 1H, J = 4.5 Hz, H5¢), 4.30 (t, 1H, J = 5.1 Hz,
H3¢), 4.40 (dd, 1H, J = 3.7, 9.4 Hz, H6¢), 5.05 (bs, 1H, OH4¢), 5.10
P e´ rez-Prior, R. G o´ mez-Bombarelli, M. Gonz a´ lez-P e´ rez, I. F. C e´ spedes,
M. P. Garc ´ı a-Santos, E. Calle and J. Casado, J. Phys. Org. Chem., 2009,
2
2, 386.
(
bs, 1H, OH8¢), 5.25 (bs, 1H, OH2¢), 5.80 (d, 1H, J = 6.0 Hz, H1¢),
1
1
2 (a) M. T. P e´ rez-Prior, J. A. Manso, M. P. Garc ´ı a Santos, E. Calle and J.
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Santos, E. Calle and J. Casado,, Chem. Res. Toxicol., 2009, 22, 1320;
7
2
2
2
.95 (s, 1H, H6). Guo-AM adduct: UV lmax (H
57sh and 229. Guo-AC adduct: 1. UV lmax (H
2
O/CH
O/CH
3
CN)/nm
CN)/nm
2
3
58sh and 229; 2. UV lmax (H
2
O/CH CN)/nm 259sh and
3
(
c) M. T. P e´ rez-Prior, R. G o´ mez-Bombarelli, M. Gonz a´ lez-P e´ rez, J. A.
29.
Manso, M. P. Garc ´ı a Santos, E. Calle and J. Casado, J. Org. Chem.,
2
010, 75, 1444.
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3, 1275.
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Acknowledgements
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We thank the Spanish Ministerio de Ciencia e Innovaci o´ n and
European Regional Development Fund (CTQ2010-18999) for
supporting the research reported in this article. I.F.C.-C. thanks
the Spanish Ministerio de Asuntos Exteriores y de Cooperaci o´ n
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232 | Org. Biomol. Chem., 2011, 9, 6226–6233
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