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- W2428227953 abstract "[2,3]-Wittig rearrangements of sugar-derived dihydropyran allyl propargyl ethers located at the 2- or 4-position have been studied as useful means for extending the carbon chains of the 4- or 2-position with chirality transfer. The stereochemical course of these reactions depends on the following factors: (1) deprotonation of pro-R or pro-S-H, (2) equilibration of the lithiated stereogenic carbanion, (3) conformational inversion during the rearrangement, and (4) concerted [2,3]- or [1,2]-Wittig rearrangement. In some cases, a stepwise mechanism that involves the allyl-C-O bond cleavage is shared as the first step by both the [2,3]- and [1,2]-Wittig rearrangements. The stereochemical courses of the rearrangements are compared among the lithiated reactants to determine the reaction pathways. These mechanisms in the polyoxygenated dihydropyran ring system were further supported by DFT calculations." @default.
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- W2428227953 date "2015-06-03" @default.
- W2428227953 modified "2023-10-16" @default.
- W2428227953 title "Stereochemical Course of Wittig Rearrangements of Dihydropyran Allyl Propargyl Ethers" @default.
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- W2428227953 doi "https://doi.org/10.1021/acs.joc.5b00678" @default.
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