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A general approach is described for the synthesis and elaboration of medium-sized ring mono- and difunctionalized 8- or 9-membered ring lactone building blocks. The lactones are prepared via cascade ring expansion reactions and elaborated via Suzuki-Miyaura cross coupling and various N-functionalization reactions. This enables efficient access to diverse, medium-sized ring building blocks in a synthetically challenging and under-represented area of the pharmaceutical chemical space.
Zhou et al. (Tue,) studied this question.