The wages of syn: The development of a phosphoramidite-ligated rhodium catalyst allows the enantioselective desymmetrization of cyclic anhydrides with organozinc nucleophiles formed in situ. This methodology has been utilized for a concise synthesis of eupomatilones 4 and 7 and of the putative structure of eupomatilone 6, each of which is completed in four steps in greater than 50 % overall yield.
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Johnson et al. (2007) studied this question.
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