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Volumn 3, Issue 4, 2008, Pages 767-775

[8+2] and [8+3] cyclization reactions of alkenyl carbenes and 8-azaheptafulvenes: Direct access to tetrahydro-1-azaazulene and cyclohepta[b]pyridinone derivatives

Author keywords

Azaazulenes; Azafulvenes; Carbenes; Chromium; Cyclization

Indexed keywords


EID: 54849441477     PISSN: 18614728     EISSN: 1861471X     Source Type: Journal    
DOI: 10.1002/asia.200700340     Document Type: Article
Times cited : (23)

References (89)
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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;
    • 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.
    • 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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    • 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
    • 1 substituents with higher metal affinity (Table 2, entries 4-9).


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.