Fused 2H-chromenes are prepared by the cascade hydroarylation/cycloisomerization reactions of polyyne-type aryl propargyl ethers using indium(III) catalysis. The transformation proceeds with 6-endo-dig regioselectivity using InBr₃ (5 mol%). The method can be extended to triynes allowing the formation of three bonds in one pot. Indium(III) also catalyzes the hydroamination/hydroarylation cascade reaction of o-aryldiynyl anilines to form fused carbazoles.

中文翻译：

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铟（iii）催化的多炔型芳基炔丙基醚的级联加氢芳基化/环异构化反应合成稠合色烯†

通过铟（III）催化聚炔型芳基炔丙基醚的级联加氢芳基化/环异构化反应来制备熔融的2 H-色烯。使用InBr ₃（5mol％），以6-内切区域选择性进行转化。该方法可以扩展到三炔，允许在一锅中形成三个键。铟（III）还催化邻芳基二炔基苯胺的加氢胺化/加氢芳基化级联反应，形成稠合咔唑。