25348-63-4Relevant articles and documents
Synthesis of both enantiomers of conduritol C tetraacetate and of meso-conduritol D tetraacetate by oxidation of benzoquinone bis(ethylene acetal)
Lang, Martin,Ziegler, Thomas
, p. 768 - 776 (2008/02/07)
Epoxidation of p-benzoquinone bis(ethylene acetal) (1) with m-chloroperbenzoic acid or hydrogen peroxide/benzonitrile afforded corresponding monoepoxide 2, which was converted into p-benzoquinone mono(ethylene acetal) monoepoxide 5 with perchloric acid. D
Synthesis of haloconduritols from an endo-cycloadduct of furan and vinylene carbonate
Baran, Arif,Kazaz, Cavit,Se?en, Hasan,Sütbeyaz, Ya?ar
, p. 3643 - 3648 (2007/10/03)
A method for preparing haloconduritols having a conduritol-A construction is described. A mixture of endo- and exo-cycloadduct derivatives prepared from the Diels-Alder reaction of furan and vinylene carbonate was converted into diacetate derivatives by hydrolysis (K2CO3/MeOH) followed by acetylation (Ac2O/pyridine). Boron trihalide (BBr3 or BCl3)-assisted ring-opening of the endo-diacetate in CH2Cl2 at -78°C gave (1α,2α,3β,6β)-6-halogeno-4-cyclohexene-1,2,3-triol 1,2-diacetate from which the corresponding triacetate was prepared by acetylation (AcCl). trans-Esterification of the triacetate (MeOH/HCl) afforded (1α,2α,3β,6β)-6-halogeno-4-cyclohexene-1,2,3-triol (X=Br or Cl). BF3-Assisted ring-opening of the endo-diacetate in CH2Cl2 gave (1α,2α,3β,6β)-6-chloro-4-cyclohexene-1,2,3-triol 1,2-diacetate by means of halogen exchange.
From cycloolefins to chiral, polyfunctionalized linear C6/C12 building blocks - Biocatalysis, (-)-conduramine E
Spielvogel,Kammerer,Keller,Prinzbach
, p. 7863 - 7867 (2007/10/03)
1,4-Cyclohexadiene is the starting material for the expeditious synthesis of the 1S2S3S4R- and 1R2R3R4S-epoxy-cyclohexene-1,4-diol monoacetates through enzyme-catalyzed hydrolysis and transesterification, respectively. The absolute configurations are established by correlation of (-)-10 and known (+)-conduramine E. Ozonation and functional group manipulation open access to fully protected, polyfunctionalized C6-aldehydes whose reductive coupling to C2-symmetrical C12 building blocks is being explored. (C) 2000 Elsevier Science Ltd.