Diastereoselective two-directional synthesis and cation transport ability of the central tristetrahydrofuranyl unit of meso polyether glabrescol as naturally occurring podand
The diastereoselective synthesis of the central 2,5-linked tristetrahydrofuran (trisTHF) 6 of naturallyoccurring meso polyether, glabrescol (5), has been achieved in a two-directional manner by the vanadium(V)-catalyzed anti oxidative cyclizations of diol 14. The trisTHF podand 6 and its stereoisomeric analogs 7 and 8 exhibited outstanding cation transport abilities for physiologically important Na+
Stereospecific and biomimetic synthesis of CS and C2 symmetric 2,5-disubstituted tetrahydrofuran rings as central building blocks of biogenetically intriguing oxasqualenoids
The enantioselective synthesis of optically active (+)-tetraol 12, corresponding to the C9-C16 subunit of biogenetically and biologically intriguing oxasqualenoids 2-4, has been accomplished by the biomimetic and stereospecific cyclization of diepoxide 22. The experimental details for the preparation of the known meso tetraol 11, corresponding to the C9-C16 subunit of teurilene 1, are also described. (C) 2002 Elsevier Science Ltd. All rights reserved.
HOYE, THOMAS R.;JENKINS, SCOTT A., J. AMER. CHEM. SOC., 109,(1987) N 20, 6196-6198