Results in Table 1 highlight an interesting trend for the selective formation of 4 x:4 x′ or 3 xy depending on the nucleophilicity of the indolylallene and the external indole. 18 The desired 2,3′‐BIM 3 xy was formed preferentially when position 5 was substituted with an electron‐donating group (entries 2 and 3, Table 1 ), while formation of the 6‐ endo cyclised products 4 x:4 x′ , in ≈1:1 in all cases (entries 4–6, Table 1 ), was favoured when position 5 contained an electron‐withdrawing group.
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Synthesis of a Novel Type of 2,3'-BIMs via Platinum-Catalysed Reaction of Indolylallenes with Indoles.
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