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Pd(0)-Catalyzed phosphorus-carbon bond formation: Mechanistic and synthetic studies on the role of the palladium sources and anionic additives
Stockholm University, Faculty of Science, Department of Organic Chemistry.
Stockholm University, Faculty of Science, Department of Organic Chemistry.
2007 (English)In: Organometallics, ISSN 0276-7333, E-ISSN 1520-6041, Vol. 26, no 24, 5840-5847 p.Article in journal (Refereed) Published
Abstract [en]

Pd(PPh3)4, Pd(dba)2, Pd(OAc)2, and PdCl2, have been evaluated as possible Pd(0) sources for the palladium-catalyzed P−C bond formation via a cross-coupling of aryl halides with H-phosphonate diesters. It was found that the most efficient catalytic system can be generated from Pd(OAc)2 with a key role being played by Pd(II) and Pd(0) species with coordinated acetate ions. The reactivity of differently ligated Pd(II) complexes was determined, and 31P NMR spectroscopy studies were carried out to provide mechanistic interpretations for the observed differences between the catalytic systems.

Place, publisher, year, edition, pages
2007. Vol. 26, no 24, 5840-5847 p.
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:su:diva-19617DOI: 10.1021/om700797kISI: 000250975200015OAI: oai:DiVA.org:su-19617DiVA: diva2:186141
Available from: 2008-01-04 Created: 2008-01-04 Last updated: 2011-05-13Bibliographically approved
In thesis
1. Synthesis of C(sp2)-P bonds by palladium-catalyzed reactions: Mechanistic investigations and synthetic studies
Open this publication in new window or tab >>Synthesis of C(sp2)-P bonds by palladium-catalyzed reactions: Mechanistic investigations and synthetic studies
2011 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis focuses on synthetic and mechanistic aspects of palladium-catalyzed C(sp2)-P bond-forming reactions, with the aim to develop mild and efficient methods for the synthesis of biologically active phosphorus compounds, e.g. DNA analogs.

The first part of the thesis is devoted to detailed mechanistic investigations of the palladium-catalyzed C-P cross-coupling reaction, in order to fully understand the underlying chemistry and by rational design of the reaction conditions, improve the overall efficiency of the process and broaden its applicability. In particular influence of palladium coordination by different anions on the rate of ligand substitution and reductive elimination steps of the reaction was studied. It was found that coordination of acetate ion results in unprecedented acceleration of both of the mechanistic steps, what leads to remarkable shortening of the overall reaction times. In-depth kinetic investigations enabled to ascribe the observed effects to ability of the acetate ion to act as a bidentate ligand for palladium. This causes considerable alternation of the reaction mechanism, comparing to the reaction involving halide-containing complexes, and results in significant rate increase.

Based on the above mechanistic studies an efficient method for the synthesis of arylphosphonates, using substoichiometric amounts of inorganic acetate additive and reduced amount of catalyst, was developed.

In the next part of the thesis, efforts to further enhance the palladium-catalyzed cross-coupling efficiency by using a microwave-assisted synthesis are described. These explorations resulted in a successful development of two protocols, one for a cross-coupling of H-phosphonates and the other for H,H-phosphinates, under the microwave heating conditions. Application of this energy source resulted in extremely short reaction times, measured in minutes.

The final chapter of this thesis deals with studies on palladium-catalyzed SN2’ propargylic substitution reaction with phosphorus nucleophiles, which leads to allene products. Efficient procedure for the synthesis of allenylphosphonates and related compounds was developed. The method enables full control of stereochemistry in the allene moiety and at the asymmetric phosphorus center. Some conclusions on the mechanism of the reaction were also drawn.

Place, publisher, year, edition, pages
Stockholm: Department of Organic Chemistry, Stockholm University, 2011. 95 p.
National Category
Organic Chemistry
Research subject
Organic Chemistry
Identifiers
urn:nbn:se:su:diva-56467 (URN)978-91-7447-298-1 (ISBN)
Public defence
2011-06-09, Magnélisalen, Kemiska övningslaboratoriet, Svante Arrhenius väg 16 B, Stockholm, 10:00 (English)
Opponent
Supervisors
Note
At the time of the doctoral defense, the following paper was unpublished and had a status as follows: Paper 7: In press.Available from: 2011-05-12 Created: 2011-04-18 Last updated: 2011-05-13Bibliographically approved

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