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(5) Three-dimensional active site model were proposed on the basis of substrate mapping and molecular modeling for substrates
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32
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85088809629
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-
note
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2O (10:1, v/v) under reflux. The ratios offrons and cis were obtained as 91:9, 94:6, and 96:4 for the substrate of β-methyl, ethyl, and phenyl-γ-iodomethyl-γ-butyrolactones, respectively. Details including the medium effect will be reported elsewhere.
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33
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85088810394
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note
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3 for the substrates of 1a, 2a, and 4a.
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34
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0020352220
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33744870571
-
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note
-
Substrates la and 2a,b were hydrolyzed with relatively poor enantiodifferentiation by porcine pancreas lipase in phosphate buffer. We could obtain (+)-lb, (+)-2b, and (+)-3b with 54, 23, and 29% ee's of products at 47,44, and 55% conversion. The absolute configurations of the γ-position for all three favorable substrate lactones are S regardless of substituents at the β-position.
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-
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48
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0000595704
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(a) Hughes, D. L.; Bergan, J. J.; Amato, J. S.; Bhupathy, M.; Leazer, J. L.; McNamara, J. M.; Sidler, D. R.; Reider, P. J.; Grabowski, E. J. J J. Org. Chem. 1990, 55, 6252.
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51
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33744844527
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note
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The minimum energy conformer generated by PM3 calculation with the program of ChemSD showed rigidity and informational similarity of the γ-lactone ring between irons- and cis-β-methyl-γ-((acetyloxy)methyl)-y-butyrolactones with opposite dihedral angles of γ-acetoxymethyl groups. However the dihedral angle of one substrate could be changed with an energy less than 1.7 kcal/mol.
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52
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0028802966
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