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Unformatted text preview: A with the ( S )-configuration was produced in 68% enantiomeric excess [ Tetrahedron Lett . 2004, 45 , 4481]. Cl Tetrahedron Lett. 2004 , 45 , 3887 HO O H 3 C CH 3 Org. Lett. 2004 , 6 , 1535 C C H 3 C Br H CH 3 Br H CH 3 Br Org. Lett. 2004 , 6 , 1531 C O H + OCH 3 O CH 3 OH A (S)-enantiomer ? (2) Rank the substituents at the stereogenic carbon of A in order of descending priorities. > > > ? (2) Write a stereochemical structure for the ( S )-stereoisomer of the product. ? (2) In a related reaction (below) an aromatic aldehyde was converted to hydroxyketone B [ Tetrahedron Lett . 2004, 45 , 4583]. What term best describes the relative configurations of compounds A and B ? CHO O 2 N L-proline OH O CH 3 O 2 N + O B same configuration opposite configuration diastereomeric racemic...
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