Asymmetric epoxidation of unfactionalized olefins catalyzed by chiral salen Mn(III) immobilized onto sulfoalkyl modified zirconium poly(styrene-isopropenyl phosphonate)-phosphate and zirconium poly(styrene-phenylvinyl phosphonate)-phosphate

Liu, Zhijian; Fu, Xiangkai; Hu, Xiaoyan; Miao, Qiang

doi:10.1016/j.jorganchem.2012.05.002

Cited by 6 publications

(1 citation statement)

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“…62 2.2.9 Asymmetric epoxidation. [63][64][65][66][67][68][69] Chemical modication of zinc poly(styrene-phenylvinylphosphonate)-phosphate 70 zirconium poly(styrene-isopropenylphosphonate)-phosphate, 71,72 followed by attachment of a chiral manganese(III)-salen complex gave the polymer-immobilized catalyst 122. 122 was used for the asymmetric epoxidation of unfunctionalized olens, such as that of 123 to give 124 (Scheme 32).…”

Section: Asymmetric Cyclopropanationmentioning

confidence: 99%

Polymer-immobilized chiral catalysts

Itsuno

Hassan

2014

RSC Adv.

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This review illustrates the current strategies and potential of polymer-immobilized chiral catalysts for highly enantioselective asymmetric synthesis. Abstract:Polymer immobilization of chiral catalysts has progressed extensively over the past years. Recent intensive development of chiral organocatalysts resulted in the identification of numerous highly active catalysts, which are, however, still far less effective than transition metal catalysts. Separation of relatively large amounts of organocatalysts from the reaction mixture causes problems during product isolation. In the case of chirally modified metal catalysts, recovery of the valuable metal species and suppression of metal leaching are perpetually important requirements in the design of environmentally friendly chemical processes. Various types of chiral organocatalysts and metal catalysts have been immobilized as pendant groups onto the side chains of polymer supports. Another important polymer immobilization technique is the incorporation of a chiral catalyst into its main chain, with several types of chiral catalyst monomers having been copolymerized with achiral monomers for their production.Recently, the synthesis of chiral main-chain polymeric catalysts has progressed extensively. Moreover, many examples of polymer-immobilized catalysts exhibited higher enantioselectivities in comparison to those of the corresponding low-molecular-weight catalyst. The development of these polymer-immobilized chiral

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