On July 31, 2021, Chhanda, Sadia Afrin; Itsuno, Shinichi published an article.Category: esters-buliding-blocks The title of the article was Synthesis of cinchona squaramide polymers by Yamamoto coupling polymerization and their application in asymmetric Michael reaction. And the article contained the following:
Yamamoto coupling polymerization was used for the synthesis of polymeric chiral organocatalysts. Cinchona squaramide derivatives with dibromophenyl moiety were polymerized under the Yamamoto coupling conditions to afford the corresponding chiral polymers in good yields. Using this technique, novel cinchona alkaloid polymers containing the squaramide moiety were designed and successfully synthesized. In addition to the homopolymerization of cinchona squaramide monomers with a dibromophenyl group, achiral comonomers such as dibromobenzene were copolymerized with the cinchona monomers to yield chiral co-polymers. These chiral polymers were successfully utilized as polymeric catalysts in asym. Michael addition reactions. Good to excellent enantioselectivities were observed for different types of asym. Michael reactions. Using the chiral homopolymer catalyst I, almost perfect diastereoselectivity (>100:1) with 99% ee were obtained for the reaction between Me 2-oxocyclopentanecarboxylate and trans-β-nitrostyrene. The polymer catalysts developed in this study have robust structures and can be reused several times without a loss in their catalytic activities. The experimental process involved the reaction of Methyl 2-cyclopentanonecarboxylate(cas: 10472-24-9).Category: esters-buliding-blocks
The Article related to cinchona squaramide polymer catalyst preparation yamamoto coupling, styrene anthrone copolymer catalyst enantioselective michael addition reaction, phenylethyl anthracenone preparation and other aspects.Category: esters-buliding-blocks
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