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A palladium‐catalysed, phosphine‐free, direct arylation of 4‐phenoxyquinolines, in air is described. Using an intramolecular approach, the ring‐closed products are formed in yields of up to 95 %. This approach allows access to a range of benzofuroquinolines. An array of functional groups on both the quinoline and phenoxy rings are tolerated.
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Shanahan et al. (2018) studied this question.
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