Kim SW, Lee W, Krische MJ. Asymmetric Allylation of Glycidols Mediated by Allyl Acetate via Iridium-Catalyzed Hydrogen Transfer.
Org Lett 2017;
19:1252-1254. [PMID:
28221810 PMCID:
PMC5651674 DOI:
10.1021/acs.orglett.7b00343]
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Abstract
Glycidols prepared via Sharpless asymmetric epoxidation participate in asymmetric redox-neutral carbonyl allylation with good levels of catalyst-directed diastereoselectivity. Equally stereoselective allylations may be performed from the aldehyde oxidation level using 2-propanol as the terminal reductant. An epoxide ring-opening reaction using AlMe3-n-BuLi is used to prepare the propionate-based stereotetrad spanning C17-C23 of dictyostatin, illustrating how this method may be applied to polyketide construction.
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