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
作者:HOYE, THOMAS R.、JENKINS, SCOTT A.
DOI:——
日期:——
Asymmetric synthesis of achiral molecules: meso-selectivity
作者:Thomas R. Hoye、Scott A. Jenkins
DOI:10.1021/ja00254a056
日期:1987.9
Synthese de bis-[dihydroxy-1,2 methyl-1 ethyl]-2,5 perhydro furanne a partir de dimethyl-2,2' ethylene-3,3' bis-oxirannemethanol
synthesis and the rapidly progressing rhenium(VII) chemistry. In the key rhenium(VII)-promoted syn oxidativecyclization reaction of the two-directional substrate 3, trans-syn diastereoselectivity (steric control) has been observed in contrast to our previous observation of cis-syn diastereoselectivities (chelation control) for bishomoallylictertiaryalcohols possessing the neighboring tetrahydrofuran