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- W1967564407 abstract "Two l-proline-based linear polystyrene anchored catalysts 1a and 1b have been synthesized efficiently. The catalytic activities and stereoselectivity of these readily tunable and amphiphilic organocatalysts were evaluated in the direct asymmetric aldol reaction of various aromatic aldehydes and ketones. By using 5 mol % of the catalysts, the corresponding products of the aldol reaction were obtained in good yields (up to 94%) and with excellent anti diastereoselectivities (up to 96:4) and enantioselectivities (up to 96% ee) in DMF in the presence of water. The yields of these reactions in a ketone/water mixture were lower than those in wet DMF (up to 76%). However, the stereoselectivity was comparable (up to 93:7 anti/syn ratio and 95% ee, respectively). In addition, catalysts 1a and 1b could be recovered by a simple precipitation and filtration process. They could also be re-used for at least five times without obvious loss of catalytic efficiency." @default.
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- W1967564407 date "2007-11-01" @default.
- W1967564407 modified "2023-10-06" @default.
- W1967564407 title "Linear polystyrene anchored l-proline, new recyclable organocatalysts for the aldol reaction in the presence of water" @default.
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- W1967564407 doi "https://doi.org/10.1016/j.tetasy.2007.10.032" @default.
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