Zobrazeno 1 - 10
of 19
pro vyhledávání: '"Sven, Tamp"'
Asymmetric synthesis of the 2,2,3-trisubstituted cyclopentanone, D-ring fragment of 9,11-secosterols
Publikováno v:
Tetrahedron. 70:6723-6727
As a part of our studies on the total synthesis of 9,11-secosterols, the possibility of creating a substituted and functionalized D-ring fragment with three consecutive stereocentres, one of which was quaternary, was studied. The simple starting comp
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::45cbaf0490eb500de3a31798913d8ed0
https://doi.org/10.1016/j.tet.2014.07.079
https://doi.org/10.1016/j.tet.2014.07.079
Autor:
Sven Tamp, Sirje Vija, Ülo Lille, Ly Villo, Omar Parve, Tõnis Pehk, Kady Danilas, Andrus Metsala
Publikováno v:
Journal of Theoretical Chemistry. 2014:1-10
Critical assessment of performance of alternative molecular modeling methods depending on a specific object and goal of the investigation is a question of continuous interest. This prompted us to demonstrate the origin of the guidelines we have used
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4e4a398585b3b28296ecbb6775fc4dd9
https://doi.org/10.1155/2014/714164
https://doi.org/10.1155/2014/714164
Autor:
Andrus Metsala, Sven Tamp, Nigulas Samel, Tõnis Pehk, Ly Villo, Ülo Lille, Jaan Parve, Imre Vallikivi, Omar Parve, Ivar Järving
Publikováno v:
ChemCatChem. 6:1998-2010
A lipase may catalyze either one or more of the three reactions of 11-acetyl-prostaglandin E2 in methanol-containing reaction medium: esterification, deacetylation, and/or elimination. The catalytic performance depends on the lipase and on the methan
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::327c20f0ab8a1bbb3e99bf735ff1b8ca
https://doi.org/10.1002/cctc.201400019
https://doi.org/10.1002/cctc.201400019
Autor:
Tõnis Pehk, Ly Villo, Omar Parve, Lauri Vares, Eva Doyle, Aleksander-Mati Müürisepp, Jaan Parve, Sven Tamp, Marina Kudryashova
Publikováno v:
Chirality. 25:793-798
A stereochemically safe high-yielding procedure for linking unprotected as well as protected hydroxycarboxylic acids to chiral secondary alcohols via glycolic acid linker is proposed. L-menthol has been linked with both enantiomers of mandelic, malic
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::144b97970f51a6e0d4a47b4168da2a0f
https://doi.org/10.1002/chir.22217
https://doi.org/10.1002/chir.22217
Publikováno v:
Magnetic Resonance in Chemistry. 49:76-82
Spin–spin coupling constants between nuclei in NMR spectroscopy reflect their spatial arrangement. A number of calculation methods, applying different levels of theory, have been developed to support the stereochemical assignment of novel compounds
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1d1d144d51b3c2e85fa3fd01e03ac69b
https://doi.org/10.1002/mrc.2712
https://doi.org/10.1002/mrc.2712
Autor:
Sven Tamp, Ly Villo, Tõnis Pehk, Ülo Lille, Malle Kreen, Andrus Metsala, Marina Kudryashova, Omar Parve
Publikováno v:
Journal of Molecular Catalysis B: Enzymatic. 68:44-51
An extension of the scope of the chemoenzymatic strategy for the synthesis of stereochemically pure pyranose deoxy sugar esters of different carboxylic acids has been achieved. The objective of the work was to extend the strategy to the synthesis of
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2ae01b970e009680f3e16bd344bc5bdc
https://doi.org/10.1016/j.molcatb.2010.09.008
https://doi.org/10.1016/j.molcatb.2010.09.008
Autor:
Masaaki Mishima, Martin Kutsar, Ilmar A. Koppel, Peeter Burk, Sven Tamp, Juan Z. Dávalos, Rebeca Herrero, Ivo Leito, José-Luis M. Abboud, Rafael Notario
Publikováno v:
The Journal of Physical Chemistry A. 114:10694-10699
This work employs Fourier transform ion cyclotron resonance (FT-ICR) and the Gaussian quantum chemistry composite methods W1 and G2 to experimentally and computationally analyze gas-phase basicities (GB) for a series of weak bases in the basicity reg
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7c6fbf5b1546d0b1d13fe87873f4932b
https://doi.org/10.1021/jp104917a
https://doi.org/10.1021/jp104917a
Autor:
Omar Parve, Lauri Vares, Sven Tamp, Andrus Metsala, Sirje Vija, Malle Kreen, Ene Kiirend, Kady Danilas, Tõnis Pehk
Publikováno v:
Journal of Molecular Structure: THEOCHEM. 851:84-91
A total conformational analysis of diastereomeric esters was performed and the conformational shielding models (CSM) of the esters necessary for the NMR spectroscopic stereochemical assignment of carboxylic acids or alcohols were calculated. The este
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::92b2c990c88ad4c9a3f6dfadffd2bf74
https://doi.org/10.1016/j.theochem.2007.10.045
https://doi.org/10.1016/j.theochem.2007.10.045
Publikováno v:
ChemInform. 46
As a part of our studies on the total synthesis of 9,11-secosterols, the possibility of creating a substituted and functionalized D-ring fragment with three consecutive stereocentres, one of which was quaternary, was studied. The simple starting comp
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::81d92dd6a868efce2d56db48e0be5e08
https://doi.org/10.1002/chin.201506252
https://doi.org/10.1002/chin.201506252
Autor:
Sven Tamp, Peeter Burk
Publikováno v:
Journal of Molecular Structure: THEOCHEM. 638:119-128
B3LYP and PBE0 density functional calculations with different effective core potentials (ECP) and basis sets were used to investigate gas-phase geometries, basicities, and proton affinities of alkali metal oxides M 2 O and hydroxides MOH (M=K, Rb, Cs
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::feb30e019174cda4a7fd6c346cdffb45
https://doi.org/10.1016/s0166-1280(03)00540-2
https://doi.org/10.1016/s0166-1280(03)00540-2