Lewis acid promoted reaction of acetals with η3-crotyltitanium reagents
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Add time:08/09/2019 Source:sciencedirect.com
In the presence of Lewis acids, η3-crotyltitanocene reagents react with acetals to give homoallylic ethers in moderate to good yields. In all cases the reactions proceed with total γ-regioselectivity. The diastereoselectivity for aliphatic acetals is no longer observed in comparison with the total anti selectivity in the reaction involving benzaldehyde dimethyl acetal, as well as in the intramolecular addition to a tethered acetal.
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- Related Information
- Asymmetric aldol addition of aldehydes to a difluoroketene silyl acetal catalyzed by chiral Lewis acids08/10/2019
- Substituent effects on the reaction mode between 2-hydroxybenzyl alcohol derivatives and MEM chloride: synthesis and mechanistic aspects of seven- and ten-membered benzo-fused O,O-acetals08/08/2019
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