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Publicly Available Published by De Gruyter December 15, 2010

Improved synthesis of Bn5CpRu(CO)2Cl and its application as racemization catalyst in preparative-scale metalloenzymatic dynamic kinetic resolution of 1-phenylethanol

Denys Mavrynsky, Liisa T. Kanerva, Reijo Sillanpää and Reko Leino

An improved gram-scale synthesis of Bn5CpRu(CO)2Cl is reported based on heating of pentabenzylcyclopentadiene with Ru3(CO)12 at 160 °C under argon atmosphere in mesitylene followed by addition of chloroform, continued heating, and evaporation of the solvents. Subsequent washing of unreacted ligand precursor with hexane provided pure title compound in 77 % yield. In combination with Candida antarctica lipase B (CAL-B) (Novozym 435), this complex forms a highly active racemization catalyst for metallo-enzymatic dynamic kinetic resolution (DKR) of secondary alcohols as demonstrated in the present work by converting 100 g of racemic 1-phenylethanol to (R)-1-phenylethanol in >99 % ee and 93 % overall yield over two steps using 0.05 mol % loading of the metal catalyst and 1 mass % loading of immobilized enzyme. In addition, the synthesis and crystallographic characterization of the palladium congener Bn5CpPd(PPh3)Cl are briefly discussed.


Conference

International Conference on Organic Synthesis (ICOS-18), International Conference on Organic Synthesis, ICOS, Organic Synthesis, 18th, Bergen, Norway, 2010-08-01–2010-08-06


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Online erschienen: 2010-12-15
Erschienen im Druck: 2010-12-15

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