1. (a) For an overview, see Wnuk, S. F. Tetrahedron 1993, 49, 9877–9936;
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3. (c) For more recent examples, see: Young, R. J.; Shaw-Ponter, S.; Thomson, J. B.; Miller, J. A.; Cumming, J. G.; Pugh, A. W.; Rider, P. Bioorg. Med. Chem. Lett. 1995, 5, 2599–2604; Yoshimura, Y.; Kitano, K.; Yamada, K.; Sakata, S.; Miura, S.; Ashida, N.; Machida, H.; Matsuda, A. Nucleic Acids Symposium Series No. 37, Oxford University Press, 1997, 43–44.
4. Secrist III, J. A.; Parker, W. B.; Tiwari, K. N.; Messini, L.; Shaddix, S. C.; Rose, L. M.; Bennett Jr., L. L.; Montgomery, J. A. Nucleosides, Nucleotides 1995, 14(3–5), 675–686; Secrist III, J. A.; Tiwari, K. N.; Riordan, J. M.; Montgomery, J. A. J. Med. Chem. 1991, 34, 2361–2366.
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