Halogenated heterocycles are of significant value in the synthesis of natural and unnatural products due to their reactivity and ease of derivatization. 1 The most straightforward method for their synthesis is by treatment of the unsubstituted parent substrate with an electrophilic halogen source. For benzofused heterocycles such as benzofurans, benzothiophenes, and indoles, this typically provides access to 3-halogenated substrates, which have found frequent application in ...
