Scheme 16.
Synthesis of 2,2′-bi-1H-indoles, 2,3′-bi-1H-indoles, 3,3′-bi-1H-indoles, indolo[3,2-b]indoles, indolo[2,3-b]indoles, and 4,4′-diaza-3,3′-bi-1H-indole.
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