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Publikationer (10 of 111) Visa alla publikationer
Verendel, J. J., Nordlund, M. & Andersson, P. G. (2013). Selective, metal-catalyzed transfer of H2 and CO from polyols to alkenes. ChemSusChem, 6(3), 426-429.
Öppna denna publikation i ny flik eller fönster >>Selective, metal-catalyzed transfer of H2 and CO from polyols to alkenes
2013 (Engelska)Ingår i: ChemSusChem, ISSN 1864-5631, E-ISSN 1864-564X, Vol. 6, nr 3, s. 426-429Artikel i tidskrift (Refereegranskat) Published
Nyckelord
catalysis, transition metals, renewable feedstocks
Nationell ämneskategori
Organisk kemi
Forskningsämne
Organisk kemi
Identifikatorer
urn:nbn:se:uu:diva-182817 (URN)10.1002/cssc.201200843 (DOI)000315715400008 ()
Tillgänglig från: 2012-10-15 Skapad: 2012-10-15 Senast uppdaterad: 2017-12-07Bibliografiskt granskad
Verendel, J. J., Li, J.-Q., Quan, X., Peters, B., Zhou, T., Gautun, O. R., . . . Andersson, P. G. (2012). Chiral Hetero- and Carbocyclic Compounds from the Asymmetric Hydrogenation of Cyclic Alkenes. Chemistry - A European Journal, 18(21), 6507-6513.
Öppna denna publikation i ny flik eller fönster >>Chiral Hetero- and Carbocyclic Compounds from the Asymmetric Hydrogenation of Cyclic Alkenes
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2012 (Engelska)Ingår i: Chemistry - A European Journal, ISSN 0947-6539, E-ISSN 1521-3765, Vol. 18, nr 21, s. 6507-6513Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Several types of chiral hetero- and carbocyclic compounds have been synthesized by using the asymmetric hydrogenation of cyclic alkenes. N,P-Ligated iridium catalysts reduced six-membered cyclic alkenes with various substituents and heterofunctionality in good to excellent enantioselectivity, whereas the reduction of five-membered cyclic alkenes was generally less selective, giving modest enantiomeric excesses. The stereoselectivity of the hydrogenation depended more strongly on the substrate structure for the five- rather than the six-membered cyclic alkenes. The major enantiomer formed in the reduction of six-membered alkenes could be predicted from a selectivity model and isomeric alkenes had complementary enantioselectivity, giving opposite optical isomers upon hydrogenation. The utility of the reaction was demonstrated by using it as a key step in the preparation of chiral 1,3-cis-cyclohexane carboxylates.

Nyckelord
asymmetric synthesis, heterocyclic compounds, homogeneous catalysis, hydrogenation, iridium
Nationell ämneskategori
Kemi
Identifikatorer
urn:nbn:se:uu:diva-175620 (URN)10.1002/chem.201104073 (DOI)000304045000016 ()
Tillgänglig från: 2012-06-12 Skapad: 2012-06-11 Senast uppdaterad: 2017-12-07Bibliografiskt granskad
Cadu, A. & Andersson, P. G. (2012). Development of iridium-catalyzed asymmetric hydrogenation: New catalysts, new substrate scope. Journal of Organometallic Chemistry, 714, 3-11.
Öppna denna publikation i ny flik eller fönster >>Development of iridium-catalyzed asymmetric hydrogenation: New catalysts, new substrate scope
2012 (Engelska)Ingår i: Journal of Organometallic Chemistry, ISSN 0022-328X, E-ISSN 1872-8561, Vol. 714, s. 3-11Artikel, forskningsöversikt (Refereegranskat) Published
Abstract [en]

A review. The asym. hydrogenation of olefins is a tremendously powerful tool used to synthesize chiral mols. The field was pioneered using rhodium- and ruthenium- based catalysts; however, catalysts based on both of these metals suffer from limitations, such as the need for directing substituents near or even adjacent to the olefin. Iridium-based catalysts do not suffer from this flaw and can thus hydrogenate a wide variety of olefins, including some tetra substituted ones. It is also possible for iridium-based catalysts to hydrogenate hetero-π bonds such as those found in heteroarom. rings. This review summarizes the contributions made to this field by the authors in the past few years. [on SciFinder(R)]

Nyckelord
review iridium catalyst asym hydrogenation alkene heteroarom
Nationell ämneskategori
Organisk kemi
Forskningsämne
Kemi
Identifikatorer
urn:nbn:se:uu:diva-187584 (URN)10.1016/j.jorganchem.2012.04.002 (DOI)000306239400003 ()
Tillgänglig från: 2012-12-10 Skapad: 2012-12-07 Senast uppdaterad: 2017-12-07Bibliografiskt granskad
Zhou, T., Peters, B., Maldonado, M., Govender, T. & Andersson, P. (2012). Enantioselective Synthesis of Chiral Sulfones by Ir-Catalyzed Asymmetric Hydrogenation: A Facile Approach to the Preparation of Chiral Allylic and Homoallylic Compounds. Journal of the American Chemical Society, 134(33), 13592-13595.
Öppna denna publikation i ny flik eller fönster >>Enantioselective Synthesis of Chiral Sulfones by Ir-Catalyzed Asymmetric Hydrogenation: A Facile Approach to the Preparation of Chiral Allylic and Homoallylic Compounds
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2012 (Engelska)Ingår i: Journal of the American Chemical Society, ISSN 0002-7863, E-ISSN 1520-5126, Vol. 134, nr 33, s. 13592-13595Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

A highly efficient and enantioselective Ir-catalyzed hydrogenation of unsaturated sulfones was developed. Chiral cyclic and acyclic sulfones were produced in excellent enantioselectivities (up to 98% ee). Coupled with the Ramberg-Backlund rearrangement, this reaction offers a novel route to chiral allylic and homoallylic compounds in excellent enantioselectivities (up to 97% ee) and high yields (up to 94%).

Nationell ämneskategori
Organisk kemi
Identifikatorer
urn:nbn:se:uu:diva-182640 (URN)10.1021/ja306731u (DOI)000307699000016 ()
Tillgänglig från: 2012-10-14 Skapad: 2012-10-14 Senast uppdaterad: 2017-12-07Bibliografiskt granskad
Li, J.-Q., Xu, Q. & Andersson, P. (2012). Highly Enantioselective Iridium-Catalyzed Hydrogenation of α,β-Unsaturated Esters. Chemistry - A European Journal, 18(34), 10609-10616.
Öppna denna publikation i ny flik eller fönster >>Highly Enantioselective Iridium-Catalyzed Hydrogenation of α,β-Unsaturated Esters
2012 (Engelska)Ingår i: Chemistry - A European Journal, ISSN 0947-6539, E-ISSN 1521-3765, Vol. 18, nr 34, s. 10609-10616Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

α,β-Unsaturated esters have been employed as substrates in iridium-catalyzed asymmetric hydrogenation. Full conversions and good to excellent enantioselectivities (up to 99 % ee) were obtained for a broad range of substrates with both aromatic- and aliphatic substituents on the prochiral carbon. The hydrogenated products are highly useful as building blocks in the synthesis of a variety of natural products and pharmaceuticals.

Nationell ämneskategori
Organisk kemi
Identifikatorer
urn:nbn:se:uu:diva-182641 (URN)10.1002/chem.201200907 (DOI)000307387300020 ()22807347 (PubMedID)
Tillgänglig från: 2012-10-14 Skapad: 2012-10-14 Senast uppdaterad: 2017-12-07Bibliografiskt granskad
Cadu, A., Paptchikhine, A. & Andersson, P. G. (2011). Birch Reaction Followed by Asymmetric Iridium-Catalysed Hydrogenation. Synthesis (Stuttgart) (23), 3796-3800.
Öppna denna publikation i ny flik eller fönster >>Birch Reaction Followed by Asymmetric Iridium-Catalysed Hydrogenation
2011 (Engelska)Ingår i: Synthesis (Stuttgart), ISSN 0039-7881, E-ISSN 1437-210X, nr 23, s. 3796-3800Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Birch reaction products are asymmetrically hydrogenated with high enantio- and diastereoselectivity via iridium catalysts. This new method of producing chiral compounds was explored for a variety of 1,3-di- and 1,2,4-tri-substituted cyclohexadienes.

Nyckelord
asymmetric catalysis, iridium, hydrogenation, reduction, radical reaction
Nationell ämneskategori
Naturvetenskap
Identifikatorer
urn:nbn:se:uu:diva-167652 (URN)10.1055/s-0031-1289569 (DOI)000298156900007 ()
Tillgänglig från: 2012-02-01 Skapad: 2012-01-31 Senast uppdaterad: 2017-12-08Bibliografiskt granskad
Li, J.-Q., Peters, B. & Andersson, P. G. (2011). Highly Enantioselective Asymmetric Isomerization of Primary Allylic Alcohols with an Iridium-N,P Complex. Chemistry - A European Journal, 17(40), 11143-11145.
Öppna denna publikation i ny flik eller fönster >>Highly Enantioselective Asymmetric Isomerization of Primary Allylic Alcohols with an Iridium-N,P Complex
2011 (Engelska)Ingår i: Chemistry - A European Journal, ISSN 0947-6539, E-ISSN 1521-3765, Vol. 17, nr 40, s. 11143-11145Artikel i tidskrift (Refereegranskat) Published
Nyckelord
aldehydes, allylic alcohols, asymmetric catalysis, iridium, isomerization, N, P ligands
Nationell ämneskategori
Kemi
Identifikatorer
urn:nbn:se:uu:diva-164577 (URN)10.1002/chem.201101524 (DOI)000297013100011 ()
Tillgänglig från: 2011-12-21 Skapad: 2011-12-21 Senast uppdaterad: 2017-12-08Bibliografiskt granskad
Mazuela, J., Norrby, P.-O., Andersson, P. G., Pamies, O. & Dieguez, M. (2011). Pyranoside Phosphite-Oxazoline Ligands for the Highly Versatile and Enantioselective Ir-Catalyzed Hydrogenation of Minimally Functionalized Olefins: A Combined Theoretical and Experimental Study. Journal of the American Chemical Society, 133(34), 13634-13645.
Öppna denna publikation i ny flik eller fönster >>Pyranoside Phosphite-Oxazoline Ligands for the Highly Versatile and Enantioselective Ir-Catalyzed Hydrogenation of Minimally Functionalized Olefins: A Combined Theoretical and Experimental Study
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2011 (Engelska)Ingår i: Journal of the American Chemical Society, ISSN 0002-7863, E-ISSN 1520-5126, Vol. 133, nr 34, s. 13634-13645Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

A modular set of phosphite-oxazoline (P,N) ligands has been applied to the title reaction. Excellent ligands have been identified for a range of substrates, including previously challenging terminally disubstituted olefins, where we now have reached enantioselectivities of 99% for a range of substrates. The selectivity is best for minimally functionalized substrates with at least a moderate size difference between geminal groups. A DFT study has allowed identification of the preferred pathway. Computational prediction of enantioselectivities gave very good accuracy.

Nationell ämneskategori
Naturvetenskap
Identifikatorer
urn:nbn:se:uu:diva-161755 (URN)10.1021/ja204948k (DOI)000295551600066 ()
Tillgänglig från: 2011-11-21 Skapad: 2011-11-17 Senast uppdaterad: 2017-12-08Bibliografiskt granskad
Mazuela, J., Paptchikhine, A., Tolstoy, P., Pàmies, O., Diéguez, M. & Andersson, P. G. (2010). A new class of modular P,N-ligand library for asymmetric Pd-catalyzed allylic substitution reactions: a study of the key Pd-pi-allyl intermediates. Chemistry - A European Journal, 16(2), 620-638.
Öppna denna publikation i ny flik eller fönster >>A new class of modular P,N-ligand library for asymmetric Pd-catalyzed allylic substitution reactions: a study of the key Pd-pi-allyl intermediates
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2010 (Engelska)Ingår i: Chemistry - A European Journal, ISSN 0947-6539, E-ISSN 1521-3765, Vol. 16, nr 2, s. 620-638Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

A new class of modular P,N-ligand library has been synthesized and screened in the Pd-catalyzed allylic substitution reactions of several substrate types. These series of ligands can be prepared efficiently from easily accessible hydroxyl-oxazole/thiazole derivatives. Their modular nature enables the bridge length, the substituents at the heterocyclic ring and in the alkyl backbone chain, the configuration of the ligand backbone, and the substituents/configurations in the biaryl phosphite moiety to be easily and systematically varied. By carefully selecting the ligand components, therefore, high regio- and enantioselectivities (ee values up to 96 %) and good activities are achieved in a broad range of mono-, di-, and trisubstituted linear hindered and unhindered substrates and cyclic substrates. The NMR spectroscopic and DFT studies on the Pd-pi-allyl intermediates provide a deeper understanding of the effect of ligand parameters on the origin of enantioselectivity.

Nyckelord
Allylic substitution, Asymmetric catalysis, Ligand design, N.P ligands, Palladium
Nationell ämneskategori
Kemi
Identifikatorer
urn:nbn:se:uu:diva-121861 (URN)10.1002/chem.200901842 (DOI)000274265100030 ()19937621 (PubMedID)
Tillgänglig från: 2010-03-31 Skapad: 2010-03-31 Senast uppdaterad: 2017-12-12Bibliografiskt granskad
Mazuela, J., Paptchikhine, A., Pàmies, O., Andersson, P. G. & Diéguez, M. (2010). Adaptative Biaryl Phosphite-Oxazole and Phosphite-Thiazole Ligands for Asymmetric Ir-Catalyzed Hydrogenation of Alkenes. Chemistry - A European Journal, 16(15), 4567-4576.
Öppna denna publikation i ny flik eller fönster >>Adaptative Biaryl Phosphite-Oxazole and Phosphite-Thiazole Ligands for Asymmetric Ir-Catalyzed Hydrogenation of Alkenes
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2010 (Engelska)Ingår i: Chemistry - A European Journal, ISSN 0947-6539, E-ISSN 1521-3765, Vol. 16, nr 15, s. 4567-4576Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

A library of readily available phosphite-oxazole/thiazole ligands (L1 a-g-L7 a-g) was applied in the Ir-catalyzed asymmetric hydrogenation of several largely unfunctionalized E- and Z-trisubstituted and 1,1-disubstituted terminal alkenes. The ability of the catalysts to transfer chiral information to the product could be tuned by choosing suitable ligand components (bridge length, the substituents in the heterocyclic ring and the alkyl backbone chain, the configuration of the ligand backbone, and the substituents/configurations in the biaryl phosphite moiety), so that enantioselectivities could be maximized for each substrate as required. Enantioselectivities were therefore excellent (enantiomeric excess (ee) values up to >99 %) for a wide range of E- and Z-trisubstituted and 1,1-disubstituted terminal alkenes. The biaryl phosphite moiety was a very advantageous ligand component in terms of substrate versatility.

Nyckelord
alkenes, asymmetric catalysis, hydrogenation, iridium, P, N ligands
Nationell ämneskategori
Kemi
Identifikatorer
urn:nbn:se:uu:diva-121860 (URN)10.1002/chem.200903350 (DOI)000277331000018 ()20229536 (PubMedID)
Tillgänglig från: 2010-03-31 Skapad: 2010-03-31 Senast uppdaterad: 2017-12-12Bibliografiskt granskad
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