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[2+2]: b) W. D. Wulff, K. L. Faron, J. Su, J. P. Springer, A. L. Rheingold, J. Chem. Soc. Perkin Trans. 1 1999, 197-219;
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for [3+2] cyclization with alkynyl carbenes, see: b) H. Schirmer, T. Labahn, B. Flynn, Y.-T. Wu, A. de Meijere, Synlett 1999, 2004-2006.
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The [8+2] cycloaddition of 8-azaheptafulvenes was reported to occur with highly reactive substrates such as cumulenes (allenes, ketenes, isocyanates) and doubly activated styrenes; see: a) K. Hayakawa, H. Nishiyama, K. Kanematsu, J. Org. Chem. 1985, 50, 512-517;
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The [8+2] cycloaddition of 8-azaheptafulvenes was reported to occur with highly reactive substrates such as cumulenes (allenes, ketenes, isocyanates) and doubly activated styrenes; see: a) K. Hayakawa, H. Nishiyama, K. Kanematsu, J. Org. Chem. 1985, 50, 512-517;
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As far as we are aware, the cycloaddition of 8-(4-chlorophenyl)-8- heptaazafulvene with tetramethyloxylallyl cation (37% yield) represents the sole precedent for the [8+3] cyclization of 8-azaheptafulvenes; see: T. Ishizu, K. Harano, M. Yasuda, K. Kanematsu, J. Org. Chem. 1981, 46, 3630-3634.
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As far as we are aware, the cycloaddition of 8-(4-chlorophenyl)-8- heptaazafulvene with tetramethyloxylallyl cation (37% yield) represents the sole precedent for the [8+3] cyclization of 8-azaheptafulvenes; see: T. Ishizu, K. Harano, M. Yasuda, K. Kanematsu, J. Org. Chem. 1981, 46, 3630-3634.
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Lee, S.14
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Doll, R.J.21
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more..
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for a review, see: b) E. Tojo, J. Nat. Prod. 1989, 52, 909-921.
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Tojo, E.1
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85
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54849430396
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The use of acetonitrile as solvent seems to favor the [8+2] cyclization over the [8+3, Owing to its coordinating ability, acetonitrile could compete with the intramolecular chelation of functional R1 substituents (transition state IV, Thus, low-coordinating R1 substituents lead to the [8+2] cycloadducts (Table 1, whereas the corresponding [8+3] cycloadducts are formed in the case of R1 substituents with higher metal affinity Table 2, entries 4-9
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1 substituents with higher metal affinity (Table 2, entries 4-9).
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