Formal [4+2] cycloaddition reactions of N -sulfonyl-2,2 ′ -biindoles: synthesis of indolo[2,3- a ]carbazoles and indigo azines
摘要:
The formal [4+2] cycloaddition reactions of readily available N-sulfonyl-2,2'-biindoles, with various dienophiles is reported. The reaction with carbon-centered dienophiles leading to indolo[2.3-a]carbazoles is facilitated by the sulfonyl, which is lost as part of the aromatization process. Reaction with aza-diertophiles gives access to indigo azines. (C) 2004 Elsevier Ltd. All rights reserved.
Formal [4+2] cycloaddition reactions of N -sulfonyl-2,2 ′ -biindoles: synthesis of indolo[2,3- a ]carbazoles and indigo azines
作者:Jeffrey T. Kuethe、Ian W. Davies
DOI:10.1016/j.tetlet.2004.03.178
日期:2004.5
The formal [4+2] cycloaddition reactions of readily available N-sulfonyl-2,2'-biindoles, with various dienophiles is reported. The reaction with carbon-centered dienophiles leading to indolo[2.3-a]carbazoles is facilitated by the sulfonyl, which is lost as part of the aromatization process. Reaction with aza-diertophiles gives access to indigo azines. (C) 2004 Elsevier Ltd. All rights reserved.