Abstractmagnified imageThe selective fluorination of diamantane, triamantane, [121]tetramantane, and [1(2,3)4]pentamantane bromides and alcohols was achieved by using the fluorinating agents silver fluoride (AgF) and diethylaminosulfur trifluoride (DAST). Various mono‐, di‐, tri‐ and even tetrafluorinated diamondoid derivatives were prepared and characterized. We were also able to prepare the amino fluoro and the fluoro alcohol derivatives of diamantane from the corresponding monoprotected diamondoid diols. These reactions can be carried out in a highly selective manner and proceed without isomerizations. The fluorinated, unequally disubstituted derivatives are valuable compounds for the exploration of electronic, pharmacological, and material properties of functionalized diamondoids.
Monoprotection of Diols as a Key Step for the Selective Synthesis of Unequally Disubstituted Diamondoids (Nanodiamonds)
作者:Hartmut Schwertfeger、Christian Würtele、Michael Serafin、Heike Hausmann、Robert M. K. Carlson、Jeremy E. P. Dahl、Peter R. Schreiner
DOI:10.1021/jo801321s
日期:2008.10.3
(desymmetrization) of diamondoid, benzylic, and ethynyl diols has been achieved using fluorinated alcohols such as 2,2,2-trifluoroethanol (TFE) under acidic conditions. This practical acid-catalyzed S(N)1 reaction opens the door for the synthesis of novel bifunctional diamondoids. With diamantane as an example, we show that the resulting monoethers can be used to prepare selectively, for instance, amino
Hydroxy Derivatives of Diamantane, Triamantane, and [121]Tetramantane: Selective Preparation of Bis-Apical Derivatives
作者:Natalie A. Fokina、Boryslav A. Tkachenko、Anika Merz、Michael Serafin、Jeremy E. P. Dahl、Robert M. K. Carlson、Andrey A. Fokin、Peter R. Schreiner
DOI:10.1002/ejoc.200700378
日期:2007.10
Functionalizations of diamantane, triamantane, and tetramantane with electrophilic reagents (Br2, nitric acid) lead to various apical and medial disubstituted products that were separated and characterized individually. The highly desirable and otherwise inaccessible thermodynamically more stable apical bis-derivatives were obtained with high preparative yields through acid catalyzed isomerizations
The invention at hand describes functionalized diols of diamondoids, in which one of the two hydroxy groups is masked by a protective group, as well as methods for producing these functionalized diols. The protective group is a group —CHR
1
R
2
, wherein R
1
and R
2
stand for alkyl groups and the protective group comprises at least one halogen atom. The monoethers of the diamondoid diols according to the present invention are produced by reacting the diamondoid diol with a halogenated alcohol CHOHR
1
R
2
in the presence of a catalyst acid.
The monoetherified diols allow for the targeted production of derivatives of diamondoids, for example, of the corresponding aminoalcohols and aminocarboxylic acids. For that purpose, the diamondoid monoether is reacted in a first step with a halogen nitrile in a Ritter reaction to the corresponding monoether amide. From this monoether amide, the corresponding aminoalcohol can be produced by reacting the protective group —CHR
1
R
2
first with trifluoroacetic acid to the alkanoyloxy group and by subsequently obtaining the aminoalcohol by reaction with thiourea, ethanol and glacial acetic acid.
The aminoalcohol can be reacted with a sulfuric acid/formic acid or oleum/formic acid to the corresponding aminocarboxylic acid.
The amino, hydroxy and carboxylic groups of the diamondoids can be converted into many other functional groups.
DIAMONDOID DERIVATIVES POSSESSING THERAPEUTIC ACTIVITY IN THE TREATMENT OF VIRAL DISORDERS
申请人:Yu Chu-Yi
公开号:US20080300317A1
公开(公告)日:2008-12-04
This invention relates to diamondoid derivatives which exhibit therapeutic activity. Specifically, the diamondoid derivatives herein exhibit therapeutic effects in the treatment of viral disorders. Also provided are methods of treatment, prevention and inhibition of viral disorders in a subject in need.