The stereoselective protective group-free synthesis of the C1–C16 fragment of (+)-sorangicin A consisting of a dihydropyran subunit with a chiral alkyl substituent is achieved. The synthesis of the 4-stereogenic centered subunit involved key reactions such as Noyori asymmetric transfer hydrogenation, Achmatowicz oxidative rearrangement, and highly diastereoselective allylation of the Achmatowicz adduct.
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Organic & Biomolecular Chemistry
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