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- W3204019587 abstract "This work presents the synthesis of six new phase-transfer organocatalysts in which the squaramide unit is directly linked to the nitrogen atom of an aza-crown ether. Four chiral skeletons, namely hydroquinine, quinine, cinchonine (cinchonas), and α-d-glucopyranoside were responsible for the asymmetric construction of an all-carbon quaternary stereogenic center in α-alkylation and Michael addition reactions of malonic esters. We investigated the effects of these different chiral units and that of crown ethers with different sizes on catalytic activity and enantioselectivity. During extensive parameter investigations, both conventional and emerging green solvents were screened, providing valuable α,α-disubstituted malonic ester derivatives with excellent yields (up to 98%)." @default.
- W3204019587 created "2021-10-11" @default.
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- W3204019587 date "2021-10-29" @default.
- W3204019587 modified "2023-10-17" @default.
- W3204019587 title "Synthesis of Novel Crown Ether-Squaramides and Their Application as Phase-Transfer Catalysts" @default.
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- W3204019587 doi "https://doi.org/10.3390/molecules26216542" @default.
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