Tetrahedron p. 2371 - 2380 (1999)
Update date:2022-08-10
Topics:
Janosik, Tomasz
Bergman, Jan
2,3'-Biindolyl (9) has been transformed into indolo[3,2-a]carbazoles 16a-b by means of formal [4 + 2] cycloadditions with co-formation of the Michael adducts 17a-b. The parent indolo[3,2-a]carbazole (6) has been prepared in one step from 9 in excellent yield. Several 3-substituted 2,3'- biindolyls have also been prepared in good yields and underwent further transformations, demonstrating the versatility of 2,3'-biindolyl (9) as a building block for synthesis of indolo[3,2-a]carbazoles.
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