Cyclic allene intermediates in intramolecular dehydro Diels-Alder reactions:: Labeling and theoretical cycloaromatization studies

被引:59
作者
Rodríguez, D
Navarro-Vázquez, A
Castedo, L
Domínguez, D
Saá, C
机构
[1] Univ Santiago de Compostela, Fac Quim, CSIC, Dept Quim Organ, Santiago De Compostela 15782, Spain
[2] Univ Santiago de Compostela, Fac Quim, CSIC, Unidad Asociada, Santiago De Compostela 15782, Spain
关键词
D O I
10.1021/jo0265380
中图分类号
O62 [有机化学];
学科分类号
070303 ; 081704 ;
摘要
A comprehensive theoretical and experimental investigation of dehydro Diels-Alder reactions examining the evolution of the cyclic allene intermediates under conditions for intramolecular and ionic and radical intermolecular cycloaromatization processes is reported. Theoretical calculations showed that the most favored intramolecular path for cycloaromatization of 1,2,4-cyclohexatriene 4 and its benzoannulated derivative 14, strained cyclic allenes, consists of a pair of successive [1,21 H shifts rather than a [1,51 shift. Cycloaromatization of cyclic allenes may follow both inter- and intramolecular pathways, depending on the experimental conditions (use of protic or aprotic solvents). For synthetic purposes, the best procedure is to use a protic solvent to promote the ionic intermolecular route, the fastest and highest yielding. When the reaction is carried out in CCl4, intermolecular radical addition of chlorine to the cyclic allene competes with intramolecular aromatization paths. Theoretical calculations predict a low barrier for the reaction of cyclic allenes with carbon tetrachloride, and that the cyclic allenes act as nucleophiles in this reaction.
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收藏
页码:1938 / 1946
页数:9
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