Ansari NH, Taylor MC, Söderberg BCG. Syntheses of three naturally occurring polybrominated 3,3'-bi-1
H-indoles.
Tetrahedron Lett 2017;
58:1053-1056. [PMID:
28966402 DOI:
10.1016/j.tetlet.2017.01.103]
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Abstract
The naturally occurring polybrominated indoles 2,2',5,5'-tetrabromo-3,3'-bi-1H-indole, 2,2',6,6'-tetrabromo-3,3'-bi-1H-indole, and 2,2',5,5',6,6'-hexabromo-3,3'-bi-1H-indole were synthesized using a palladium catalyzed, carbon monoxide mediated, double reductive N-heterocyclization of 2,3-bis(2-nitro-4(or 5)-bromophenyl)-1,4-butadienes as the key step.
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