Bph 4, where the phosphines pr2 have varying substituents. They are a subset of chiral phosphines, a broader class of compounds where the stereogenic center can reside at sites other than phosphorus. Enantioselective synthesis of pchiral tertiary phosphine. The products were characterized by 1h and 31p nmr measurements. The screening of these derivatives as ligands in rhodiumcatalyzed asymmetric hydrogenation of dimethyl itaconate has shown a. Enantioselective cucatalyzed arylation of secondary. P,nligands and organocatalysts have shown promise for further investigation. For these reasons, effective chiral catalysts for nucleophilic phosphine catalysis are scarce, seriously limiting the development of asymmetric variants. First applications of 1ag in the rhodiumcatalyzed asymmetric hydrogenation of unsaturated carboxylic acid derivatives demonstrate the usefulness of our ligands. Applicable to asymmetric hydrogenation under mild conditions applications. Transition metalcatalyzed asymmetric hydrogenation of.
These compounds play a pivotal role as ligands and organocatalysts, respectively, in asymmetric reactions. This work demonstrates, on a small scale, a synthetic strategy for making resolved chiral phosphines that are rich in functional groups, their combinatorial elaboration by solidphase synthesis, and their application to. Airstable chiral primary phosphines part i synthesis. We demonstrate that allenes, chiral 1,2dienes, appended with basic functionality can serve as ligands for transition metals. Accelerated and enantioselective synthesis of a library of p. Pchiral phosphines are organophosphorus compounds of the formula prr. Design and synthesis of phosphine coupling reactions by. Using phosphine aldehydes to generate new transition metal. The reaction proceeds efficiently with a wide array of.
Andersson department of chemical and biological engineering organic chemistry chalmers university of technology abstract this thesis deals with the enantioselective synthesis of chiral mixed phosphorousnitrogen. According to the nmr investigation of the ptcl 2 p 2type complexes, the steroidal phosphines are trawscoordinated with respect to the ptcentre exclusively. Asymmetric synthesis of chiral phosphines and arsines. Like nr 3, phosphines have a lone pair on the central atom that can be donated to a metal. A general synthesis of chiral 4,5dihydro3hdinaphthophosphepines 1ag is described. Optically active phosphines which have a chiral center at phosphorus and can coordinate to transition metals. Asymmetric synthesis of chiral phosphines and arsines promoted by organometallic complexes liu fengli b. Chiral quest phosphine ligands one of the most efficient methods for constructing chiral compounds is asymmetric hydrogenation. Pstereogenic compounds brandon rosen 29 march 2014. The presence of an asymmetric carbon center is one of several structural features that induce chirality in organic and inorganic molecules. Furthermore, the synthesis of a new chiral amine functionalized nhc ligand is explored, which has potential applications as a ligand in the metalcatalyzed enantioselective hydrogenation of polar bonds. Synthesis of new chiral phosphines for asymmetric catalysis kagan. Asymmetric catalytic synthesis of pstereogenic phosphines. Kwon chiral phosphines chiral catalysts, ligands, and.
A chiral moleculeion is nonsuperposable on its mirror image. Request pdf synthesis and application of chiral monodentate phosphines in asymmetric hydrogenation chiral monodentate phosphines ligands were the first ligands to be investigated in the field. Catalytic synthesis of nonracemic pchiral phosphine derivatives remains a significant challenge. In designing new phosphines there are a number of design features that need be. Apr, 2004 functionalized chiral diazaphospholanes ligate to a variety of transition metals, yielding chiral, catalytically active, metal complexes. The new methods developed will be applied to the synthesis of important molecules. Phosphorus nmr is a technique that just works thanks, nature. Synthesis of phosphines having chiral organic groups. All these phosphines behave presumably as bidentate ligands. Furthermore, because the energy barrier to umbrella flipping of phosphines is quite high, chiralatphosphorus ligands can be isolated in enantioenriched form and introduced to metal centers, bringing asymmetry just about as close to the metal as it can get in chiral complexes. Reported here is a highly efficient and accelerated catalytic asymmetric synthesis of p.
Enantioselective synthesis of pchiral tertiary phosphine oxides with an ethynyl group via cuicatalyzed azidealkyne cycloaddition renyi zhu,a long chen,a xiaosi hu,a feng zhou ab and jian zhou abc we report the highly enantioselective synthesis of pchiral tertiary phosphine oxides featuring an ethynyl. Oct 12, 2016 classical methods for the synthesis of pstereogenic phosphines usually rely on auxiliarybased or resolution processes. Enantioselective synthesis of planarchiral phosphines. The asymmetric phosphinecatalyzed synthesis of pyrrolines has been challenging due to a. Cyclic chiral phosphines based on spirocyclic skeletons. Chiral phosphines are essential ligands for enantioselective metalcatalyzed reactions.
Advanced studies on the synthesis of organophosphorus. Enantioselective synthesis of planarchiral phosphines with 1,ndioxanparacyclophane scaffold and their application as chiral ligands. These compounds play a pivotal role as ligands and. A novel method for the synthesis of chiral sulfonated phosphines. Synthesis of chiral heterocyclic phosphines for application. Catalytic enantioselective synthesis of quaternary 3,3. Synthesis of novel chiral quaternary phosphonium fluorides. A versatile and efficient pdoac 2 1,1bisdiisopropylphosphinoferrocenecatalyzed crosscoupling of thiols with aryl halides was developed.
Chiral quest phosphine ligands in chemical synthesis. Enantioselective acylations catalyzed by chiral phosphines. Relatively stable and easytohandle crystalline solid. Chiral quest phosphine ligands in chemical synthesis sigma. A robust synthetic route from lhydroxyproline lhyp to phosphines has established an expandable library of six chiral aminophosphines, which were. The synthesis of novel 3 and 17diphenylphosphinoandrostane derivatives via homogeneous catalytic pc coupling is described. School of physical and mathematical sciences a thesis submitted to the nanyang technological university in fulfillment of the requirement for the degree of doctor of philosophy in chemistry 2010. Synthesis and application of chiral monodentate phosphines.
Most of the chiral phosphines commonly used today display planar or point chirality where the asymmetric feature is presented in the carbon framework of the ligand. Synthesis of new chiral monodentate phosphines and their use. Enantioselectivities up to 95% ee for the hydrogenation of methyl. In general, bidentate phosphine ligands have been found to give excellent control in a number of catalytic asymmetric reactions. Accelerated and enantioselective synthesis of a library of. According to the nmr investigation of the ptcl2p2type complexes, the steroidal phosphines are transcoordinated with respect to the ptcentre exclusively. Airstable chiral primary phosphines part i synthesis, stability and applications rachel m. The resulting ligands represent a new class of monodentate chiral phosphines. Sep 04, 2014 at present, the synthesis of new chiral phosphines designed specifically for nucleophilic organocatalysis remains a significant challenge. Solution and solidstate structural analysis reveals that one olefin of the allene can. Sliding in an atmosphere of benzyl chloride promoted adsorption of chlorine to the iron surface. Synthesis and applications of pchirogenic and axially chiral. Chiral phosphines play significant roles in asymmetric catalysis. Although pstereogenic phosphines have been known as effective ligands for enantioselective catalysis for over 40 years, they are less frequently.
In addition, they may also be used as nucleophilic chiral catalysts for the synthesis of other chiral molecules. Synthesis of pchiral phosphine ligands and their applications in. Synthesis and application of chiral monodentate phosphines in. Herein, we present a direct pdxiaophoscatalyzed crosscoupling reaction of easily accessible secondary phosphine oxides and aryl bromides, which provides rapid access to p chiral phosphine oxides. Preparation of iridium complexes 46ag and 47ag 108 6. Syntheses and application of new chiral phosphines as. The synthesis of new chiral phosphines is of major importance for organic synthesis. We describe an allenecontaining bisphosphine that, when coordinated to rhi, promotes the asymmetric addition of arylboronic acids to.
Novel substituted diphenyl tertiary phosphines of a pyrrolidine carboxylic acid derivative and their use as catalysts in the enantioselective hydrogenation of. Useful for asymmetric synthesis quinoxp advantages. Abstract the synthesis and design of new phosphines is a continuing area of interest. Recent advances in the application of chiral phosphine. Synthesis of chiral primary amines and l actams 162 9. In the early exploration stage of asymmetric nucleophilic phosphine organocatalysis, chiral phosphines that had originally been designed as ligands for metalcatalyzed reactions were selected and examined.
Chiral aminophosphines derived from hydroxyproline and. These include chiral phosphines, which are widely used in chemical industry but difficult and expensive to produce, novel catalysts and biocompatible polyester materials. The products were characterized by 1 h and 31 p nmr measurements. School of physical and mathematical sciences a thesis submitted to the nanyang technological university in fulfillment of the requirement for. Solidphase synthesis of chiral 3,4diazaphospholanes and. Design and synthesis of phosphine ligands for pallaiumcatalyzed coupling reactions by william scott brown a dissertation submitted in partial fulfillment of the requirements. Synthesis and applications of pchirogenic and axially chiral p,n. Design and synthesis of phosphine ligands for pallaiumcatalyzed coupling reactions by william scott brown a dissertation submitted in partial fulfillment of the requirements for the doctor of philosophy in the department of chemistry in the graduate school of the university of alabama tuscaloosa, alabama 2009. Synthesis and structures of allenecontaining ligands figure 1. Bidentate phosphine ligands for asymmetric synthesis quinoxp. Here we report cucatalyzed enantioselective arylation of secondary phosphine oxides with diaryliodonium salts for the synthesis of tertiary phosphine oxides with high enantiomeric excess.
At present, the synthesis of new chiral phosphines designed specifically for nucleophilic organocatalysis remains a significant challenge. Functionalized chiral diazaphospholanes ligate to a variety of transition metals, yielding chiral, catalytically active, metal complexes. Synthesis of new chiral phosphine ligands and their. Asymmetric catalytic performance is determined not only by the metal center but also by the chiral ligand selected. Enantioselective catalysis using pchiral phosphines and. The development of transitionmetalcatalyzed methods for the synthesis of p chiral phosphine derivatives poses a considerable challenge.
Previous work has established that amino acid derivatization of the carboxyl groups of r,r n,n. Read synthesis of chiral heterocyclic phosphines for application in asymmetric catalysis, cheminform on deepdyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips. The term chirality is derived from the ancient greek word for hand. Sep 30, 2016 classical methods for the synthesis of pstereogenic phosphines usually rely on auxiliarybased or resolution processes. These structurally different chiral phosphines can be selected to catalyze. Enantiopure chiral phosphines bearing a sulfinyl group and. Chiral allenecontaining phosphines in asymmetric catalysis. Aryl bromides and chlorides can be coupled to aliphatic and aromatic thiols the widest substrate scope of any reported to date. Synthesis of chiral phosphine oxides and phosphines via michaelis. Synthesis of new chiral monodentate phosphines and their. When chiral paryl phosphines were applied due to the chirality on the phosphorus, a mixture of epimers were formed which may cause varying enantioselectivities in consecutive catalytic reactions. These chiral ligands are typically divided into three design archetypes.
A novel method for the synthesis of chiral sulfonated. Chiral aminophosphines derived from hydroxyproline and their. With none of the phosphorus containing molecules was phosphorus detected on the surface. Kazumasa kanda, shoya oshima, tsubasa shizuno, risa hamanaka, miku fukai, takanori shibata. Although pstereogenic phosphines have been known as effective ligands for enantioselective catalysis for over 40 years, 2. A straightforward synthesis of pchiral polycyclic phosphines by an asymmetric dielsalder reaction of 1alkyl1,2 diphospholes and 5r lmenthyloxy 25h furanone moxf is presented. Synthesis and applications of pchirogenic and axially. Using phosphine aldehydes to generate new metal complexes and the synthesis of chiral nhcamino ligands kanghee park master of science. Advanced studies on the synthesis of organophosphorus compounds. Palladiumcatalyzed asymmetric addition of diarylphosphines. This work demonstrates, on a small scale, a synthetic strategy for making resolved chiral phosphines that are rich in functional groups, their combinatorial elaboration by solidphase synthesis, and their application to enantioselective asymmetric allylic. Cyclic chiral phosphines based on phospholane ring skeletons. Cyclic chiral phosphines based on ferrocene skeletons.
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