| 1. |
|
|
| 2. |
- Koch, T., et al.
(författare)
-
PNA-Peptide Chimerae
- 1995
-
Ingår i: Tetrahedron Letters. - 0040-4039 .- 1873-3581. ; 36:38, s. 6933-6936
-
Tidskriftsartikel (refereegranskat)abstract
- Radioactive labelling of PNA has been performed try linking a peptide segment to the PNA which is substrate for protein kinase A. The enzymatic phosphorylation proceeds in almost quantitative yields.
|
|
| 3. |
- Eriksson, Jonas, et al.
(författare)
-
Solid supported active esters as linkers: modification of reactivity using iron carbonyl complexes
- 2006
-
Ingår i: Tetrahedron Letters. - : Elsevier BV. - 0040-4039 .- 1873-3581. ; 47:5, s. 635-638
-
Tidskriftsartikel (refereegranskat)abstract
- The reactivity of three polymer-bound cyclohexadienoic acid active esters was modified by complexation with iron tricarbonyl in order to evaluate their potential use as linker systems for solid phase chemistry. The best results were obtained with the tetrallnorophenolester, which was slowly cleaved when 1 equiv of amine was used, but could be rapidly cleaved with up to 94% yield when the amount of nucleophile was increased. (c) 2005 Elsevier Ltd. All rights reserved.
|
|
| 4. |
- Gschneidtner, Tina, 1985, et al.
(författare)
-
A photolabile protection strategy for terminal alkynes
- 2013
-
Ingår i: Tetrahedron Letters. - : Elsevier BV. - 0040-4039 .- 1873-3581. ; 54:40, s. 5426-5429
-
Tidskriftsartikel (refereegranskat)abstract
- We present a strategy for photolabile protection of terminal alkynes. Several photo-caged alcohols were synthesized via mild copper(II)-catalyzed substitution between tertiary propargylic alcohols and 2-nitrobenzyl alcohol to build up robust, base stable o-nitrobenzyl (NB) photo-cleavable compounds. We compare the new photolabile protecting group with the commonly used alkyne protecting group, 2-methyl-3-butyn-2-ol and the results show that NB ethers are stable under the cleaving conditions for the cleavage of methylbutynol protected alkynes. Additionally, we present the synthesis of photo-cleavable NB derivatives containing thiol groups that can serve as agents for photoinduced surface functionalization reactions.
|
|
| 5. |
- Lennartsson, Anders, 1980, et al.
(författare)
-
Designing photoswitches for molecular solar thermal energy storage
- 2015
-
Ingår i: Tetrahedron Letters. - : Elsevier BV. - 0040-4039 .- 1873-3581. ; 56:2015, s. 1457-1465
-
Forskningsöversikt (refereegranskat)abstract
- Solar energy conversion and solar energy storage are key challenges for a future society with limited access to fossil fuels. Certain compounds that undergo light-induced isomerisation to a metastable isomer can be used for storage of solar energy, so-called molecular solar thermal systems. Exposing the compound to sun light will generate a high energy photoisomer that can be stored. When energy is needed, the photoisomer can be catalytically converted back to the parent compound, releasing the excess energy as heat. This Letter gives examples of selected molecular solar thermal systems found in the literature. The focus of the Letter is on examples where molecular design has been used to improve the performance of the molecules, and as such it may serve as an inspiration for future design. The selected examples cover five widely studied systems, notably: anthracenes, stilbenes, azobenzenes, tetracarbonyl-fulvalene-diruthenium compounds and norbornadienes.
|
|
| 6. |
- Ljungdahl, N., et al.
(författare)
-
Rapid microwave-assisted preparation of amino-functionalized polymers
- 2008
-
Ingår i: Tetrahedron Letters. - : Elsevier BV. - 0040-4039 .- 1873-3581. ; 49:42, s. 6108-6110
-
Tidskriftsartikel (refereegranskat)abstract
- Two different methods for the rapid microwave-assisted amination of halide-functionalized polymers were investigated. Nucleophilic substitution by phthalimide, followed by ring opening with methylamine to liberate the free amine, afforded amino-substituted polymers with up to 76% conversion. The second method involves nucleophilic substitution with azide ions and subsequent treatment with triphenylphosphine. The latter method was found to be more efficient, with up to 99% conversion in favourable cases and with a reaction time of 2 x 30 min.
|
|
| 7. |
- Pera, N. P., et al.
(författare)
-
Intermolecular Pauson-Khand reactions on a galactose scaffold
- 2008
-
Ingår i: Tetrahedron Letters. - : Elsevier BV. - 0040-4039 .- 1873-3581. ; 49:17, s. 2820-2823
-
Tidskriftsartikel (refereegranskat)abstract
- An intermolecular Pauson-Khand reaction involving a carbohydrate scaffold having a pendant alkyne provides galactose derivatives with a cyclopentenone moiety in the C3-position in up to 85% yield. © 2008 Elsevier Ltd. All rights reserved.
|
|
| 8. |
|
|
| 9. |
- Baker, T. C., et al.
(författare)
-
Isolation, identification and synthesis of sex pheromone components of the carob moth, Ectomyelois ceratoniae
- 1989
-
Ingår i: Tetrahedron Letters. - 0040-4039. ; 30:22, s. 2901-2902
-
Tidskriftsartikel (refereegranskat)abstract
- The sex pheromone of females of the carob moth, Ectomyelois ceratoniae, was identified to be a mixture of (Z,E)-9,11,13-tetradecatrienal, (Z,E)-9,11-tetradecadienal and (Z)-9-tetradecenal in the ratio of 10:1:1. A synthetic blend proved to be attractive. GC/EAD + GC/MS investigations showed (Z,E)-9,11,13-tetradecatrienal, (Z,E)-9,11-tetradecadienal and (Z)-9-tetradecenal to be the sex pheromone of the carob moth. Blends of synthetic compounds are active.
|
|
| 10. |
- Bhattacharyya, Tapes, et al.
(författare)
-
An efficient and convergent route towards water-soluble, chiral and amphiphilic macrocycles
- 2001
-
Ingår i: Tetrahedron Letters. - 0040-4039. ; 42:15, s. 2873-2875
-
Tidskriftsartikel (refereegranskat)abstract
- A practical procedure for the synthesis of water-soluble, chiral and amphiphilic macrocyclic molecules is described. Acylation of p-xylylene diamine with Fmoc-protected glycine and aspartic acid, followed by removal of the Fmoc moiety afforded amino acid:p-xylene conjugates as free diamines. These diamines were converted to symmetrical and unsymmetrical macrocycles via stepwise urea formation using p-nitrophenyl chloroformate.
|
|
