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Publicly Available Published by De Gruyter February 3, 2012

Catalytic asymmetric synthesis using chirality-switchable helical polymer as a chiral ligand

  • Michinori Suginome , Takeshi Yamamoto , Yuuya Nagata , Tetsuya Yamada and Yuto Akai

Single-handed PQXphos, i.e., helical poly(quinoxaline-2,3-diyl)s bearing diarylphosphino pendant groups, served as remarkable chiral ligands in palladium-catalyzed asymmetric hydrosilylation of styrenes and asymmetric biaryl synthesis by Suzuki–Miyaura coupling, affording up to 98 % enantiomeric excess (e.e.) in both reactions. A palladium complex of high-molecular-weight variant (1000mer) of PQXphos could be reused eight times by virtue of the formation of an insoluble polymer complex. PQXphos underwent solvent-dependent inversion of the helical sense, enabling production of either of two enantiomeric products using a single PQXphos.


Conference

International Symposium on Organometallic Chemistry Directed Towards Organic Synthesis (OMCOS-16), International Symposium on Organometallic Chemistry Directed Toward Organic Synthesis, OMCOS, Organometallic Chemistry Directed Toward Organic Synthesis, 16th, Shanghai, China, 2011-07-24–2011-07-28


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Online erschienen: 2012-2-3
Erschienen im Druck: 2012-2-3

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