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For some recent reports of the generation of amidyl radicals from hydroxamic acid derivatives see: (a) Clark, A. J.; Peacock, J. L. Tetrahedron Lett. 1998, 39, 1265. (b) Clark, A. J.; Filik, R. P.; Peacock, J. L.; Thomas, G. H. Synlett 1999, 441. (c) Clark, A. J.; Deeth, R. J.; Samuel, C. J.; Wongtap, H. Synlett 1999, 444.
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We have made a few attempts to effect such a cyclization but without success.
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For examples of TSE protection of nitrogen functionality in various heteroaromatics see: (a) Faubl, H. Tetrahedron Lett. 1979, 491. (b) Gonzalez, C.; Greenhouse, R.; Tallabs, R.; Muchowski, J. M. Can. J. Chem. 1983, 61, 1697. (c) Rao, A. K. S. B.; Rao, C. G.; Singh, B. B. Synth. Commun. 1994, 24, 341. (d) Bashford, K. E.; Cooper, A. L.; Kane, P. D.; Moody, C. J. Tetrahedron Lett. 2002, 43, 135.
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For examples of TSE protection of nitrogen functionality in various heteroaromatics see: (a) Faubl, H. Tetrahedron Lett. 1979, 491. (b) Gonzalez, C.; Greenhouse, R.; Tallabs, R.; Muchowski, J. M. Can. J. Chem. 1983, 61, 1697. (c) Rao, A. K. S. B.; Rao, C. G.; Singh, B. B. Synth. Commun. 1994, 24, 341. (d) Bashford, K. E.; Cooper, A. L.; Kane, P. D.; Moody, C. J. Tetrahedron Lett. 2002, 43, 135.
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