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2005
Hydroxylation
O 0216
Asymmetric Dihydroxylation with Recoverable Cinchona Alkaloid Derivatives: A
Note and an Improved, Insoluble Polymer-Bound Ligand Architecture.
31- 048 Warning
— Asymmetric dihydroxylations (AD) of alkenes (II) and (IV) are performed at reduced concentrations of ligand (DHQD)2-PHAL and a constant amount of OsO4. The
significance of the results is discussed in connection with previous work which used
analogous insoluble polymer-bound (IPB) Cinchona alkaloid derivatives. Ligand (I)
exhibits the established stability requirements as IPB-ligand and allows highly enantioselective IPB-AD of representative alkenes. — (MANDOLI, A.; PINI, D.; FIORI, M.;
SALVADORI*, P.; Eur. J. Org. Chem. 2005, 7, 1271-1282; Dip. Chim. Chim. Ind.,
Univ. Pisa, I-56126 Pisa, Italy; Eng.) — Klein
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