Asymmetric Dihydroxylations using Immobilized Alkaloids with an Anthraquinone Core
作者:Carsten Bolm、Astrid Maischak
DOI:10.1055/s-2001-9701
日期:——
In osmium-catalyzed dihydroxylations use of polymer-supported alkaloids with an anthraquinone core allows to obtain optically active diols with high enantioselectivities. Soluble as well as insoluble polymers have been tested for immobilization.
Synthesis of Optically Active Lipopeptide Analogs from the Outer Membrane of Escherichia coli.
作者:Muneaki KURIMURA、Masumi TAKEMATO、Kazuo ACHIWA
DOI:10.1248/cpb.39.2590
日期:——
The synthesis of opticallyactive lipopeptide derivatives has been accomplished by the use of chiral glycerol derivatives. Lipopeptide derivatives with (R)-glycerol moieties showed higher mitogenic activities than those with the (S)-configuration. N-2,2,2-Trichloroethoxycarbonyl lipopeptide derivatives increased mitogenic activity.
Synthesis of biologically active pentapeptide analogs of the N-terminal part of lipoprotein from the outer membrane of Escherichia coli.
作者:Muneaki KURIMURA、Masumi TAKEMOTO、Kazuo ACHIWA
DOI:10.1248/cpb.38.1110
日期:——
Newly synthesized lipopentapeptide derivatives with (R___-)-glycerol moieties showed higher mitogenic activities than those with the (S___-)-configuration.
Tire asymmetric dihydroxylation (AD) of primary allylic halides is described. Enantiomeric excesses range from 40 to 98%. Subsequent base treatment gives epoxy alcohols in high yields. This strategy is further illustrated by the synthesis of (-)-diepoxybutane, an important C-4-chiral building block.
Becker, Heinrich; Sharpless, K. Barry, Angewandte Chemie, 1996, vol. 108, # 4, p. 447 - 449