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- W2945641191 abstract "The useful synthons sugar enones (2-benzyloxypyran-3-ones) derived from pentoses have been prepared starting from 2-acetoxyglycals or benzyl pentopyranosides. The glycals were glycosylated with benzyl alcohol in the presence of a Lewis acid (SnCl4 or InCl3) to give enantioenriched enones (ee = 80–90%). Under catalysis with InCl3, benzyl 2-enopyranosides gave also the enones (ee = 87%). On the other hand, enantiomerically pure enones were synthesized via an improved straightforward and high yielding sequence (70% overall) from benzyl pentopyranosides. However, the yields of both, the glycosylation of glycals as well as some specific reactions of the sequence from glycosides, were lowered when a p-nitro substituent was introduced into the benzyl group. These routes became impractical in the case of p-acetamidobenzyl derivatives, because of the large extent of decomposition. Therefore, alternative sequences have been developed for the synthesis of 2-(p-acetamidobenzyloxy)pyran-3-ones." @default.
- W2945641191 created "2019-05-29" @default.
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- W2945641191 date "2019-06-01" @default.
- W2945641191 modified "2023-10-18" @default.
- W2945641191 title "Synthesis of enantiomerically pure enones (2-benzyloxypyran-3-ones) derived from pentoses" @default.
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- W2945641191 doi "https://doi.org/10.1016/j.carres.2019.05.005" @default.
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