作者:George S.Y. Ng、Lung-Chi Yuan、Ignac J. Jakovac、J. Bryan Jones
DOI:10.1016/s0040-4020(01)82410-8
日期:——
alcohol dehydrogenase-catalyzed oxidations of meso-diols as a route to chirallactones of asymmetric synthetic value are described. The acyclic meso substrates, cis-2,3-dimethyl- and -diethylbutane-l,4-diols, and cis-2,4-dimethylpentane-l,5diol, are stereospecifically oxidized in good yields to the corresponding enantiomerically pure γ- and δ-lactones. The oxidation of cis-3,4-bis(hydroxymethyl)thiacyclopentane
Die Herstellung von 3, 5-disubstituierten Cyclopentenen durch Ozonolyse von Norbornadien
作者:C. A. Grob、H. R. Pfaendler
DOI:10.1002/hlca.19700530828
日期:——
The ozonization of norbornadiene is described. Oxidation of the intermediate with silver oxide furnishes 4-cyclopentene-cis-1, 3-dicarboxylic acid, reduction with sodium borohydride cis-1, 3-bis-hydroxymethylcyclopent-4-ene. The latter was converted to cis-3, 5-dimethylcyclopentene by reduction of the corresponding bis-tosylate with LiAlH4. Hydrogenation of the ozonization intermediate over palladium-lead
A synthetic approach to tacamonine. Access to 3-epitacamonine and 14-epitacamonine
作者:Tse-Lok Ho、Chun-Yuan Su
DOI:10.1016/s0040-4020(00)01025-5
日期:2001.1
3-Epitacamonine and 14-epitacamonine have been synthesized starting from the dinitrile 3. The synthetic route was designed on the basis of symmetric considerations which emphasized the establishment of the relative configuration in two of the three stereocenters. (C) 2001 Elsevier Science Ltd. All rights reserved.