This review summarizes the current state-of-the-art procedures in terms of the preparation of N-arylindoles. After a short introduction, the transition-metal-free procedures available for the N-arylation of indoles are briefly discussed. Then, the nickel-catalyzed and palladium-catalyzed N-arylation of indoles are both discussed. In the next section, copper-catalyzed procedures for the N-arylation of indoles are described. The final section focuses on recent findings in the field of biologically active N-arylindoles.

A new method for the preparation of halocyclobutenes has been developed. The developed process relies on halocyclobutanols dehydrated by means of tetrafluoroboric acid in dichloromethane at room temperature. The process allows for high yields of halocyclobutenes to be achieved with alcohols that do not trigger the formation of isomeric allylic halides.

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