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- W2313721846 abstract "The enantioselective synthesis of 3,5-diarylpyrazolines is accomplished by means of asymmetric phase-transfer catalysis. The authors found the cinchona-derived quaternary ammonium salt 1 bearing an ortho-methoxybenzyl group at the quinuclidine nitrogen to efficiently promote the enantioselective conjugate addition of Boc-protected hydrazine to various chalcones. The combination of catalyst 1, hydrazine, and an inorganic base leads to an efficient ammonium-amide ion pairing accounting for the high enantioselectivities obtained. Subsequent imine formation ensures the irreversible formation of the desired products in good yields and enantio-selectivities." @default.
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- W2313721846 date "2010-10-21" @default.
- W2313721846 modified "2023-10-17" @default.
- W2313721846 title "Phase-Transfer Catalysis in the Asymmetric Synthesis of Pyrazolines" @default.
- W2313721846 doi "https://doi.org/10.1055/s-0030-1258789" @default.
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