WO2007140954A1 - Complex of ruthenium and osmium, method of production thereof and use thereof as (pre)catalysts of the metathesis reaction - Google Patents

Complex of ruthenium and osmium, method of production thereof and use thereof as (pre)catalysts of the metathesis reaction Download PDF

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WO2007140954A1
WO2007140954A1 PCT/EP2007/004901 EP2007004901W WO2007140954A1 WO 2007140954 A1 WO2007140954 A1 WO 2007140954A1 EP 2007004901 W EP2007004901 W EP 2007004901W WO 2007140954 A1 WO2007140954 A1 WO 2007140954A1
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Karol Grela
Michal Barbasiewicz
Anna Szadkowska
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Umicore Ag & Co. Kg
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Priority to US12/303,615 priority Critical patent/US8318965B2/en
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Priority to US13/572,372 priority patent/US8658796B2/en

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    • C07F15/00—Compounds containing elements of Groups 8, 9, 10 or 18 of the Periodic System
    • C07F15/0006—Compounds containing elements of Groups 8, 9, 10 or 18 of the Periodic System compounds of the platinum group
    • C07F15/0046—Ruthenium compounds
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    • B01J31/16—Catalysts comprising hydrides, coordination complexes or organic compounds containing coordination complexes
    • B01J31/18—Catalysts comprising hydrides, coordination complexes or organic compounds containing coordination complexes containing nitrogen, phosphorus, arsenic or antimony as complexing atoms, e.g. in pyridine ligands, or in resonance therewith, e.g. in isocyanide ligands C=N-R or as complexed central atoms
    • B01J31/1805—Catalysts comprising hydrides, coordination complexes or organic compounds containing coordination complexes containing nitrogen, phosphorus, arsenic or antimony as complexing atoms, e.g. in pyridine ligands, or in resonance therewith, e.g. in isocyanide ligands C=N-R or as complexed central atoms the ligands containing nitrogen
    • B01J31/181—Cyclic ligands, including e.g. non-condensed polycyclic ligands, comprising at least one complexing nitrogen atom as ring member, e.g. pyridine
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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    • B01J31/00—Catalysts comprising hydrides, coordination complexes or organic compounds
    • B01J31/16—Catalysts comprising hydrides, coordination complexes or organic compounds containing coordination complexes
    • B01J31/18—Catalysts comprising hydrides, coordination complexes or organic compounds containing coordination complexes containing nitrogen, phosphorus, arsenic or antimony as complexing atoms, e.g. in pyridine ligands, or in resonance therewith, e.g. in isocyanide ligands C=N-R or as complexed central atoms
    • B01J31/1805—Catalysts comprising hydrides, coordination complexes or organic compounds containing coordination complexes containing nitrogen, phosphorus, arsenic or antimony as complexing atoms, e.g. in pyridine ligands, or in resonance therewith, e.g. in isocyanide ligands C=N-R or as complexed central atoms the ligands containing nitrogen
    • B01J31/181—Cyclic ligands, including e.g. non-condensed polycyclic ligands, comprising at least one complexing nitrogen atom as ring member, e.g. pyridine
    • B01J31/1825—Ligands comprising condensed ring systems, e.g. acridine, carbazole
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    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C67/00—Preparation of carboxylic acid esters
    • C07C67/30—Preparation of carboxylic acid esters by modifying the acid moiety of the ester, such modification not being an introduction of an ester group
    • C07C67/333—Preparation of carboxylic acid esters by modifying the acid moiety of the ester, such modification not being an introduction of an ester group by isomerisation; by change of size of the carbon skeleton
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    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D207/00—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom
    • C07D207/46—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom with hetero atoms directly attached to the ring nitrogen atom
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    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D307/00—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom
    • C07D307/02—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom not condensed with other rings
    • C07D307/26—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom not condensed with other rings having one double bond between ring members or between a ring member and a non-ring member
    • C07D307/28—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom not condensed with other rings having one double bond between ring members or between a ring member and a non-ring member with only hydrogen atoms, hydrocarbon or substituted hydrocarbon radicals, directly attached to ring carbon atoms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2231/00—Catalytic reactions performed with catalysts classified in B01J31/00
    • B01J2231/10—Polymerisation reactions involving at least dual use catalysts, e.g. for both oligomerisation and polymerisation
    • B01J2231/14—Other (co) polymerisation, e.g. of lactides, epoxides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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    • B01J2231/00—Catalytic reactions performed with catalysts classified in B01J31/00
    • B01J2231/50—Redistribution or isomerisation reactions of C-C, C=C or C-C triple bonds
    • B01J2231/52—Isomerisation reactions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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    • B01J2531/00—Additional information regarding catalytic systems classified in B01J31/00
    • B01J2531/80—Complexes comprising metals of Group VIII as the central metal
    • B01J2531/82—Metals of the platinum group
    • B01J2531/821—Ruthenium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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    • B01J2531/00—Additional information regarding catalytic systems classified in B01J31/00
    • B01J2531/80—Complexes comprising metals of Group VIII as the central metal
    • B01J2531/82—Metals of the platinum group
    • B01J2531/825—Osmium

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Abstract

Complexes of ruthenium and osmium according to the invention are represented by formula (1), in which M denotes ruthenium or osmium, L denotes a neutral ligand selected from the group comprising amines, imines, phosphines (preferably stilbines, arsines, alcohols, thiols, ethers and thioethers or an N- heterocyclic carbene (NHC) ligand). The compounds of formula (1) occur in the form of two isomers: trans and cis. The method of production of complexes of ruthenium and osmium of formula (1) according to the invention is based on reacting an intermediate of formula (5) with a carbene complex of ruthenium or osmium. The invention also relates to the use of the complexes according to the invention for carrying out metathesis reactions.

Description

Complexes of ruthenium and osmium, method of production thereof and use thereof as (pre)catalysts of the metathesis reaction
The invention relates to novel metal complexes with formula 1, where M denotes ruthenium or osmium, L denotes a neutral ligand, selected from the group comprising amines, imines, phosphines (preferably stilbines, arsines, alcohols, thiols, ethers and thioethers or the N-heterocyclic carbene ligand (NHC) represented by formula 9, where
B denotes the methylene (-C-), 1,2-ethylene (-C-C-), 1,3-propenyl (- C-C-C-), 1,2-ethenylene (-C=C-) or azaethenyl (-N=C-) residue, unsubstituted or substituted with halogens, C5-C24 aryl, C1-C6 alkyl, C1-C13 perfluoroalkyl, C1-C6 cycloalkyl groups, moreover the alkyl groups may be joined together in a ring; preferably B denotes 1,2- ethylene (-CH2-CH2-)
R and R' denote, independently of one another, C5-C24 aryl, C5-C24 perfluoroaryl, C1-C26 alkyl, C1-C26 perfluoroalkyl, C1-C7 cycloalkyl groups, unsubstituted or substituted with halogens, C5-C24 aryl, C1- C6 alkyl, C1-C13 perfluoroalkyl, C1-C6 cycloalkyl groups, moreover the alkyl groups may be joined together in a ring, preferably R and R' denote, independently of one another, phenyl groups substituted with C1-C26 alkyl residues, most preferably 2,4,6-trimethylphenyl
X and X' denote an anionic ligand, selected independently of one another from the group comprising anions of halogens, the phenolate anion (C6H5O") and perfluorophenolate anion (C6F5O"), residues of arylcarboxylic, alkylcarboxylic, perfluoroalkylcarboxylic, alkylsulphonic, arylsulphonic, perfluoroalkylsulphonic acids, preferably chlorine R1 denotes hydrogen, C1-C5 alkyl, C2-C5 alkene or C3-C7 cycloalkyl, preferably hydrogen R2, R3, R4, R5, R6, R7 denote, independently, C1-C25 alkyl, C1-C25 perfluoroalkyl,
C5-C24 aryl, C2-C25 alkene or C3-C7 cycloalkyl, the nitro (-NO2), cyano (-
CN), carboxyl (-COOH), ester (-COOR"), sulphone (-SO2R"), formyl (-
CHO), sulphonamide (-SO2NR"2), or ketone (-COR") group, in which groups R" has the following meaning: C1-C5 alkyl, C1-C5 perfluoroalkyl,
C5-C24 aryl, A denotes either nitrogen or carbon placed with an R5 group having the meaning given above and a method of production thereof.
Compounds of formula 1 occur as two isomers: with formula Ia, in which atoms X and X' are arranged trans relative to one another (Fig. Ia), and with formula Ib, in which atoms X and X' are arranged cis relative to one another (Fig. Ib). The invention also relates to the use of the compounds of formula 1, both as the pure isomers with formula Ia and with formula Ib and of mixtures thereof, as (pre)catalysts in processes of metathesis.
In applications of metathesis of olefins in organic synthesis, much progress has been achieved in recent years especially in the fields of organic chemistry and polymer chemistry. Practical applications, especially on an industrial scale, require these complexes to be stable for a prolonged time in conditions of elevated temperature and it should be possible to store, transport and use them without a protective gas atmosphere. Rapidly initiating (pre)catalysts, for example of formula 2, in which Mes denotes 2,4,6-trimethylphenyl, are often characterized by lower thermal stability. In addition, some metathesis reactions, especially polymerizations (ROMP, ADMET), are difficult to control in the case of rapidly initiating (pre)catalysts. For this reason it may be advantageous to use (pre)catalysts that are characterized by a lower rate of initiation of the metathesis reaction and that possess high thermal and chemical stability (Organometallics 2005, 24, 2255). This group of (pre)catalysts has found application in particular in polymer chemistry, as initiators permitting controlled polymerization. Representatives of such (pre)catalysts are the pyridine derivatives represented by formula 3, in which iPr denotes isopropyl (Journal of Organometallic Chemistry 2000, 606, 65) and 4 (Organometallics 2004, 23, 5399).
It was found, unexpectedly, that the novel complexes of ruthenium and osmium according to the invention represented by formula 1 are particularly advantageous as (pre)catalysts, they display a low rate of initiation in ring-closure metathesis, and permit a controlled reaction of polymerization by ring opening, while displaying unusually high thermal stability and resistance to oxygen and moisture.
The complexes of ruthenium and osmium according to the invention are represented by formula 1, in which: M denotes ruthenium or osmium, L denotes a neutral ligand, selected from the group comprising amines, imines, phosphines (preferably stilbines, arsines, alcohols, thiols, ethers and thioethers or the N-heterocyclic carbene ligand (NHC) represented by formula 9, where
B denotes the methylene (-C-), 1,2-ethylene (-C-C-), 1,3-propenyl (- C-C-C-), 1,2-ethenylene (-C=C-) or azaethenyl (-N=C-) residue, unsubstituted or substituted with halogens, C5-C24 aryl, C1-C6 alkyl, C1-C13 perfluoroalkyl, C1-C6 cycloalkyl groups, moreover the alkyl groups may be joined together in a ring; preferably B denotes 1,2- ethylene (-CH2-CH2-)
R and R' denote, independently of one another, C5-C24 aryl, C5-C24 perfluoroaryl, C1-C26 alkyl, C1-C26 perfluoroalkyl, C1-C7 cycloalkyl groups, unsubstituted or substituted with halogens, C5-C24 aryl, C1- C6 alkyl, C1-C13 perfluoroalkyl, C1-C6 cycloalkyl groups, moreover the alkyl groups may be joined together in a ring, preferably R and R' denote, independently of one another, phenyl groups substituted with C1-C26 alkyl residues, most preferably 2,4,6-trimethylphenyl
X and X' denote an anionic ligand, selected independently of one another from the group comprising anions of halogens, the phenolate anion (C6H5O") and perfluorophenolate anion (C6F5O"), residues of arylcarboxylic, alkylcarboxylic, perfluoroalkylcarboxylic, alkylsulphonic, arylsulphonic, perfluoroalkylsulphonic acids, preferably chlorine R1 denotes hydrogen, C1-C5 alkyl, C2-C5 alkene or C3-C7 cycloalkyl, preferably hydrogen R2, R3, R4, R5, R6, R7 denote, independently, C1-C25 alkyl, C1-C25 perfluoroalkyl,
C5-C24 aryl, C2-C25 alkene or C3-C7 cycloalkyl, the nitro (-NO2), cyano (-
CN), carboxyl (-COOH), ester (-COOR"), sulphone (-SO2R"), formyl (-
CHO), sulphonamide (-SO2NR"2), or ketone (-COR") group, in which groups R" has the following meaning: C1-C5 alkyl, C1-C5 perfluoroalkyl,
C5-C24 aryl, A denotes either nitrogen or carbon placed with an R5 group having the meaning given above.
The compounds of formula 1 occur as two isomers: Ia, in which atoms X and X' are arranged trans relative to one another (Fig. Ia), and Ib, in which atoms X and X' are arranged cis relative to one another (Fig. Ib).
The method of production of the complexes of ruthenium and osmium of formula 1, in which: M denotes ruthenium or osmium,
L denotes a neutral ligand, selected from the group comprising amines, imines, phosphines (preferably stilbines, arsines, alcohols, thiols, ethers and thioethers or the N-heterocyclic carbene ligand (NHC) represented by formula 9, where
B denotes the methylene (-C-), 1,2-ethylene (-C-C-), 1,3-propenyl (- C-C-C-), 1,2-ethenylene (-C=C-) or azaethenyl (-N=C-) residue, unsubstituted or substituted with halogens, C5-C24 aryl, C1-C6 alkyl, Cj-C13 perfluoroalkyl, C1-C6 cycloalkyl groups, moreover the alkyl groups may be joined together in a ring; preferably B denotes 1,2- ethylene (-CH2-CH2-)
R and R' denote, independently of one another, C5-C24 aryl, C5-C24 perfluoroaryl, C1-C26 alkyl, C1-C26 perfluoroalkyl, C1-C7 cycloalkyl groups, unsubstituted or substituted with halogens, C5-C24 aryl, C1- C6 alkyl, C1-C13 perfluoroalkyl, C1-C6 cycloalkyl groups, moreover the alkyl groups may be joined together in a ring, preferably R and R1 denote, independently of one another, phenyl groups substituted with C1-C26 alkyl residues, most preferably 2,4,6-trimethylphenyl X and X' denote an anionic ligand, selected independently of one another from the group comprising anions of halogens, the phenolate anion (C6H5O") and perfluorophenolate anion (C6F5O"), residues of arylcarboxylic, alkylcarboxylic, perfluoroalkylcarboxylic, alkylsulphonic, arylsulphonic, perfluoroalkylsulphonic acids, preferably chlorine R1 denotes hydrogen, C1-C5 alkyl, C2-C5 alkene or C3-C7 cycloalkyl, preferably hydrogen
R2, R3, R4, R5, R6, R7 denote, independently, C1-C25 alkyl, C1-C25 perfluoroalkyl, C5-C24 aryl, C2-C25 alkene or C3-C7 cycloalkyl, the nitro (-NO2), cyano (- CN), carboxyl (-C00H), ester (-COOR"), sulphone (-SO2R"), formyl (- CHO), sulphonamide (-SO2NR"2), or ketone (-COR") group, in which groups R" has the following meaning: C1-C5 alkyl, C1-C5 perfluoroalkyl, C5-C24 aryl, A denotes either nitrogen or carbon placed with an R5 group having the meaning given above, is based according to the invention on reacting an intermediate with formula 5, in which R1, R2, R3, R4, R5, R6, R7 and A have the meanings given above, with a carbene complex of ruthenium or osmium of formula 6, in which M denotes ruthenium or osmium,
L, L1 and L2 denote, independently of one another, a neutral ligand selected from the group comprising amines, imines, phosphines, preferably stilbines, arsines, alcohols, thiols, ethers and thioethers or an N-heterocyclic carbene ligand (NHC) represented by formula 9, with L2 optionally denoting absence of a ligand (vacancy),
R8 and R9 denote, independently of one another, C5-C24 aryl groups, C1-C26 alkyl groups, C1-C7 cycloalkyl groups, unsubstituted or substituted with halogens, with C5-C24 aryl groups, with C1-C6 alkyl, C1-C13 perfluoroalkyl and C1-C6 cycloalkyl groups, and optionally groups R8 and R9 are joined together in a ring or form a fragment of an aromatic compound, preferably R8 denotes hydrogen and R9 denotes phenyl,
X and X' have the meaning given above
In the method according to the invention compounds of formula Ia and Ib are obtained as represented in Scheme II (experimental data) in a reaction between an N-heterocyclic aromatic compound with formula 5 and a complex of ruthenium or osmium with formula 6, optionally in the presence of a copper(I) salt, preferably copper(I) chloride. The reaction is carried out in chlorinated solvents, or in aliphatic, cycloaliphatic and aromatic hydrocarbons, or in mixtures thereof, preferably in methylene chloride for a time from 1 min to 250 h at a temperature from 0 to 1500C.
In addition, the pure isomer with formula Ib or a mixture of isomers with formula Ia and with formula Ib, with proportions of Ia and Ib from 100:0 to 0:100, can be obtained as a result of isomerization of a solution of compound Ia in chlorinated solvents, preferably methylene chloride, or in aliphatic, cycloaliphatic and aromatic hydrocarbons, or in mixtures thereof, for a time from 1 minute to 250 h at a temperature from 0 to 1500C.
The synthetic sequences that find general application in the production of (pre)catalysts with formula 1 are represented generally in Schemes I, III and V and as an example of synthesis of (pre)catalysts of formula 10, 11, 12 in Schemes II, IV and VI-XII and XVII. These routes of synthesis are generally suitable for production of compounds with formula 1.
(Pre)catalysts of formula 1 according to the invention find application in a wide range of metathesis reactions. They make it possible to conduct reactions of ring-closure metathesis (RCM), and metathesis of the "alkene-alkyne" (ene-yne) type, but they find particular application in reactions of ring-opening metathesis polymerization (ROMP). Unexpectedly, the novel (pre)catalysts of formula 1 described here proved to be slower initiators of RCM reactions than for example the comparable known (pre)catalyst of formula 3, while retaining good properties in the polymerization reaction.
A comparative example using selected (pre)catalysts shows a slower course of initiation in the case of compounds of formula 1 (Scheme XIII). Further examples explain the use of the novel (pre)catalysts in different types of metathesis reactions: Schemes XIV-XVI.
Examples of application of the invention are presented below.
Example I.
Production of a compound with formula Ia generally (Scheme I) and particularly of compound IQa (Scheme II).
Using a protective atmosphere of argon, a Schlenk flask was charged with a solid carbene metal complex of formula 6, in which M denotes ruthenium, X and X' denote chlorine, L denotes absence of a ligand, L1 denotes tricyclohexylphosphine (PCy3), L2 is an NHC ligand with formula 9, in which B denotes an ethylene fragment (-CH2CH2-), R and R' denote 2,4,5-trimethylphenyl, R8 hydrogen and R9 phenyl (so-called Grubbs second-generation catalyst, 102 mg, 0.12 mmol), anhydrous CuCI (13 mg, 0.12 mmol), and dry deoxidized CH2Cl2 (3 ml) was added. Then a solution of compound 5 was added, in which R1 = R2 = R3 = R4 = R5 = R6 = R7 = H, and A denotes carbon, (20.5 mg, 0.132 mmol) in CH2Cl2 (3 ml). The suspension obtained was stirred at 400C for 20 min. From this moment all subsequent operations were performed in air, without the need to use the protective atmosphere of argon. The reaction mixture was concentrated in an evaporator and the material obtained was fed to a short chromatography column packed with silica gel. The column was developed using pure ethyl acetate, collecting a green fraction. After evaporating the solvent and washing the residue with a small amount of a mixture of ethyl acetate and cold n-pentane, complex 10a was obtained as a green, microcrystalline solid (62 mg, 89% yield). Rf = 0.30 (ethyl acetate); 1H NMR (500 MHz, CD2CI2): 17.05 (s, IH), 8.36 (dd, IH, J = 1.3, 3.6 Hz), 7.26-8.25 (m, 4H), 7.11 (s, IH), 4.14 (s, 4H), 2.46-2.51 (m, 18H) ppm; 13C NMR (125 MHz, CD2CI2): 288.0, 212.9, 155.7, 151.7, 146.3, 139.0, 137.1, 134.0, 131.7, 129.7, 129.3, 124.6, 123.4, 116.8, 52.1, 21.3, 19.4 ppm; IR (KBr): 3436, 2950, 2915, 2735, 1733, 1607, 1589, 1496, 1481, 1417, 1401, 1379, 1318, 1263, 1211, 1175, 1154, 1133, 1095, 1035, 992, 915, 850, 833, 792, 773, 748, 646, 618, 592, 578, 512, 426, 414 cm-1; MS (ESI): 625 [M-CI + CH3CN]+. Crystals suitable for X-ray analysis were obtained from benzene/n-hexane solution.
Example II.
Production of compound Ib generally (Scheme III) and particularly of compound IQb (Scheme IV).
Using a protective atmosphere of argon, a Schlenk flask was charged with a solid carbene complex of formula 6, in which M denotes ruthenium, X and X' denote chlorine, L denotes absence of a ligand, L1 denotes tricyclohexylphosphine (PCy3), L2 is an NHC ligand with formula 9, in which B denotes a -CH2CH2- fragment, R and R' denote 2,4,5-trimethylphenyl, R8 hydrogen and R9 phenyl (so- called Grubbs second-generation catalyst, 102 mg, 0.12 mmol), and dry deoxidized CH2Cl2 (3 ml) was added. Then a solution of compound 5 was added, in which R1 = R2 = R3 = R4 = R5 = R6 = R7 = H, and A denotes nitrogen, (20.5 mg, 0.132 mmol) in CH2Cl2 (3 ml). The suspension obtained was stirred at 4O0C for 20 min and was then left unstirred at room temperature for 150 h. From this moment all subsequent operations were performed in air, without the need to use the protective atmosphere of argon. The reaction mixture was concentrated in an evaporator and the material obtained was fed to a short chromatography column packed with silica gel. The column was developed using pure ethyl acetate, collecting a wide green fraction. After evaporating the solvent and washing the residue with a small amount of a 1:1 mixture of CH2Cl2 and cold n-pentane, compound 10b was obtained as a dark green, microcrystalline solid (52 mg, 72% yield). IR (KBr): 3447, 2922, 2854, 2735, 1819, 1731, 1628, 1607, 1588, 1570, 1496, 1481, 1437, 1400, 1380, 1316, 1291, 1263, 1209, 1176, 1131, 1036, 987, 914, 845, 817, 796, 781, 742, 696, 639, 624, 577, 477, 453, 427 cm"1. 1H NMR (500 MHz, CDCl3) 2.90-1.40 (m, 18H), 4.30-3.60 (m, 4H), 6.15-8.05 (m, 4H), 8.14 (d, J = 8.1 Hz, IH), 8.30 (d, J = 4.9 Hz, IH), 17.44 (s, IH) ppm. 13C NMR (125 MHz, CDCl3) 19.1, 21.2, 119.1, 123.5, 124.4, 127.6, 130.0, 133.2, 151.2, 152.8, 157.6, 217.7, 282.3 ppm. Crystals suitable for X-ray analysis were obtained from methylene chloride/n-hexane solution.
Example III.
Production of compound Ib by isomerization of Ia generally (Scheme V) and particularly of compound IQb (Scheme VI).
Compound 10a (62 mg, 0.12 mmol) was dissolved in CH2Cl2 (1 ml). The solution was left in a dark place at room temperature for 3 days, in an argon atmosphere. After this time the solution was concentrated to dryness and washed with a mixture of solvents: ethyl acetate/n-pentane, and then methyl chloride/n- pentane. After drying, 10b was obtained as a dark green solid (48%, 30 mg). The product possesses analyses that tally with those obtained previously.
Example IV.
Production of compound 10 as a mixture of isomers IQa and IQb (Scheme XVII).
Using a protective atmosphere of argon, a Schlenk flask was charged with a solid carbene complex of formula 6, in which M denotes ruthenium, X and X1 denote chlorine, L denotes absence of a ligand, L1 denotes tricyclohexylphosphine (PCy3), L2 is an NHC ligand with formula 9, in which B denotes a -CH2CH2- fragment, R and R' denote 2,4,5-trimethylphenyl, R8 hydrogen and R9 phenyl (so- called Grubbs second-generation catalyst, 102 mg, 0.12 mmol), anhydrous CuCI (13.1 mg, 0.132 mmol), and dry deoxidized CH2Cl2 (3 ml) was added. Then a solution of compound 5 was added, in which R1 = R2 = R3 = R4 = R5 = R6 = R7 = H, and A denotes carbon, (20.6 mg, 0.132 mmol) in CH2Cl2 (3 ml). The suspension obtained was stirred at 400C for 20 min and was then left unstirred at room temperature for 25 h. From this moment all subsequent operations were performed in air, without the need to use the protective atmosphere of argon. The reaction mixture was concentrated in an evaporator and the material obtained was fed to a short chromatography column packed with silica gel. The column was developed using pure ethyl acetate, collecting a wide green fraction. After evaporating the solvent and washing the residue with a small amount of a 1:1 mixture of CH2Cl2 and cold n-pentane, compound 10 was obtained as a mixture of isomers 10a and 10b in proportions 50/50, as a dark green, microcrystalline solid (54 mg, 72% yield). Rf = 0.30 (ethyl acetate).
Example V.
Production of compound 11a (Scheme VII).
Using a protective atmosphere of argon, a Schlenk flask was charged with a solid carbene complex of formula 6, in which M denotes ruthenium, X and X' denote chlorine, L denotes absence of a ligand, L1 denotes tricyclohexylphosphine (PCy3), L2 is an NHC ligand with formula 9, in which B denotes a -CH2CH2- fragment, R and R' denote 2,4,5-trimethylphenyl, R8 hydrogen and R9 phenyl (so- called Grubbs second-generation catalyst, 101.9 mg, 0.12 mmol), anhydrous CuCI (13.1 mg, 0.12 mmol), and dry deoxidized CH2Cl2 (3 ml) was added. Then a solution of compound 5 was added, in which R1 = R2 = R3 = R4 = R5 = R6 = R7 = H, and A denotes nitrogen, (20.5 mg, 0.132 mmol) in CH2Cl2 (3 ml). The suspension obtained was stirred at 4O0C for 20 min. From this moment all subsequent operations were performed in air, without the need to use the protective atmosphere of argon. The reaction mixture was concentrated in an evaporator and the material obtained was fed to a short chromatography column packed with silica gel. The column was developed using pure ethyl acetate, collecting a green fraction. After evaporating the solvent and washing the residue with a small amount of a mixture of CH2Cl2 and cold n-pentane, complex 11 was obtained as a dark green, microcrystalline solid (52 mg, 72% yield). Rf = 0.30 (ethyl acetate); IR (KBr): 3439, 2953, 2920, 2855, 2735, 1943, 1730, 1630, 1607, 1574, 1484, 1420, 1379, 1264, 1202, 1149, 1080, 1035, 927, 910, 853, 834, 774, 716, 646, 578, 514, 473, 419 cm"1; 1H NMR (500 MHz, CDCl3) 2.38-2.50 (m, 18H), 4.16 (s, 4H), 7.08 (s, IH), 7.35-7.62 (s, IH), 8.38 (m, IH), 8.45 (d, J = 2.3 Hz, IH), 8.57 (d, J = 2.2 Hz, IH), 17.00 (s, IH) ppm. 13C NMR (125 MHz, CDCl3) 19.2, 21.2, 51.7, 116.6, 124.0, 126.5, 128.6, 129.5, 134.9, 136.2, 138.5, 138.8, 141.6, 144.2, 145.6, 147.9, 155.2, 210.5, 288.2 ppm. MS (ESI): 626 [M-C1+CH3CN]+.
Example VI.
Production of compound 11a (Scheme VIII).
Using a protective atmosphere of argon, a Schlenk flask was charged with a solid carbene complex of formula 6, in which M denotes ruthenium, X and X' denote chlorine, L denotes an NHC ligand with formula 9, in which B denotes a - CH2CH2- fragment, R and R1 denote 2,4,5-trimethylphenyl, Ll and L2 denote 3- bromopyridine, R8 denotes hydrogen and R9 phenyl (so-called Grubbs third- generation catalyst, 101.9 mg, 0.12 mmol), anhydrous CuCl (13.1 mg, 0.12 mmol), and dry deoxidized CH2Cl2 (3 ml) was added. Then a solution of compound 5 was added, in which R1 = R2 = R3 = R4 = R5 = R6 = R7 = H, and A denotes nitrogen, (20.5 mg, 0.132 mmol) in CH2Cl2 (3 ml). The suspension obtained was stirred at 4O0C for 20 min. From this moment all subsequent operations were performed in air, without the need to use the protective atmosphere of argon. The reaction mixture was concentrated in an evaporator and the material obtained was fed to a short chromatography column packed with silica gel. The column was developed using pure ethyl acetate, collecting a green fraction. After evaporating the solvent and washing the residue with a small amount of a mixture of CH2Cl2 and cold n- pentane, complex 11 was obtained as a dark green, microcrystalline solid (52 mg, 70% yield).
Example VII.
Production of compound lib (Scheme IX).
Complex 11a (trans isomer, 55 mg, 0.115 mmol) was dissolved in CH2Cl2 (2 ml). The solution was left in a dark place at room temperature for 3 days, in an argon atmosphere. After this time the solution was concentrated to dryness and washed with a mixture of solvents: methylene chloride / n-pentane. After drying, a dark brown solid was obtained (cis isomer, 62%, 34 mg). IR (KBr): 3436, 2921, 2855, 1942, 1725, 1630, 1593, 1483, 1442, 1404, 1379, 1314, 1266, 1219, 1195, 1154, 1079, 1034, 929, 907, 853, 823, 805, 768, 717, 667, 645, 630, 577, 474, 443, 420 cm'1. 1H NMR (200 MHz, CDCl3) 1.84-2.51 (m, 18H), 4.0-4.15 (s, 4H), 7.08 (s, 4H), 7.50-7.54 (m, 2H), 7.60-7.58 (m, IH), 8.38 (m, IH), 8.48 (d, J = 4.2 Hz, IH), 17.30 (s, IH) ppm.
Example VIII.
Production of compound 1 generally (Scheme I) and particularly of compound 12a (Scheme X).
Using a protective atmosphere of argon, a Schlenk flask was charged with a solid carbene complex of formula 6, in which M denotes ruthenium, X and X' denote chlorine, L denotes absence of a ligand, L1 and L2 denote PCy3, and R10 denotes hydrogen and R11 phenyl (so-called Grubbs first-generation catalyst, 146.6 mg, 0.25 mmol), anhydrous CuCI (24.6 mg, 0.25 mmol), and dry deoxidized CH2Cl2 (5 ml) was added. Then a solution of compound 5 was added, in which R1 = R2 = R3 = R4 = R5 = R6 = R7 = H, and A denotes carbon, (34.1 mg, 0.23 mmol) in CH2Cl2 (5 ml). The suspension obtained was stirred at 350C for 2 min. From this moment all subsequent operations were performed in air, without the need to use the protective atmosphere of argon. The reaction mixture was concentrated in an evaporator and the material obtained was fed to a short chromatography column packed with silica gel. The column was developed using pure ethyl acetate, collecting a green fraction. After evaporating the solvent and washing the residue with a small amount of a mixture of CH2Cl2 and cold n-pentane, complex 12a was obtained as a pale green, microcrystalline solid (83 mg, 70% yield). Rf = 0.40 (ethyl acetate).
Example IX.
Production of compound 1 generally (Scheme I) and particularly of compound 12a (Scheme XI).
Using a protective atmosphere of argon, a Schlenk flask was charged with a solid carbene complex of formula 6, in which M denotes ruthenium, X and X' denote chlorine, L denotes absence of a ligand, L1 and L2 denote PCy3, and R10 and R11 denote an indenylidene residue (184.6 mg, 0.20 mmol), anhydrous CuCI (21.8 mg, 0.22 mmol), and dry deoxidized CH2Cl2 (5 ml) was added. Then a solution of compound 5 was added, in which R1 = R2 = R3 = R4 = R5 = R6 = R7 = H, and A denotes carbon, (34.1 mg, 0.22 mmol) in CH2Cl2 (5 ml). The suspension obtained was stirred at 35°C for 2 min. From this moment all subsequent operations were performed in air, without the need to use the protective atmosphere of argon. The reaction mixture was concentrated in an evaporator and the material obtained was fed to a short chromatography column packed with silica gel. The column was developed using pure ethyl acetate, collecting a green fraction. After evaporating the solvent and washing the residue with a small amount of a mixture of CH2Cl2 and cold n-pentane, complex 12a was obtained as a pale green, microcrystalline solid (84 mg, 70% yield). Rf = 0.40 (ethyl acetate).
Example X.
Production of compound 1 generally (Scheme I) and particularly of compound 13a (Scheme XII).
Using a protective atmosphere of argon, a Schlenk flask was charged with a solid carbene complex of formula 6, in which M denotes ruthenium, X and X' denote chlorine, L denotes absence of a ligand, L1 denotes tricyclohexylphosphine (PCy3), L2 is an NHC ligand with formula 9, in which B denotes a -CH2CH2- fragment, R and R' denote 2,4,5-trimethylphenyl, R8 hydrogen and R9 phenyl (so- called Grubbs second-generation catalyst, 102 mg, 0.12 mmol), anhydrous CuCI (13 mg, 0.132 mmol), and dry deoxidized CH2Cl2 (3 ml) was added. Then a solution of compound 5 was added, in which R1 = R3 = R4 = R5 = R6 = R7 = H, R2 = CN and A denotes carbon, (20.5 mg, 0.132 mmol) in CH2Cl2 (3 ml). The suspension obtained was stirred at 400C for 20 min. From this moment all subsequent operations were performed in air, without the need to use the protective atmosphere of argon. The reaction mixture was concentrated in an evaporator and the material obtained was fed to a short chromatography column packed with silica gel. The column was developed using pure ethyl acetate, collecting a green fraction. After evaporating the solvent and washing the residue with a small amount of a mixture of ethyl acetate and cold n-pentane, complex 10 was obtained as a green, microcrystalline solid (69 mg, 89% yield). Rf = 0.30 (ethyl acetate). Examples of applications
Example XI.
Use of compounds 1 as catalyst in reactions of ring-closure metathesis and ene-vne cycloisomerization (Schemes XIII-XV).
3-cyclopentene-l,l-diethyl dicarboxylate, Pl. A solution of diene Sl (84.1 mg, 0.35 mmol) in CH2Cl2 (15 ml) was put in a Schlenk flask, and a solution of catalyst 10a (10.8 mg, 0.018 mmol, 5 mol.%) in CH2Cl2 (2.5 ml) was added at a temperature of 21-23°C. It was stirred at this temperature, and samples (0.25 ml) of the reaction mixture were taken after 15 min, 30 min, 45 min, Ih, 2h, 4h, 6h, 24h (the reaction was stopped immediately after taking the sample by adding a suitable amount of IM ethyl-vinyl ether solution). The degree of conversion in each sample was calculated on the basis of gas chromatography (32%). Product Pl was identified by comparing with a reference standard.
In a similar reaction, (pre)catalyst 10b made it possible to obtain Pl at a yield of 14%, (pre)catalyst 11a at a yield of 38% and lib at 18% yield.
In accordance with the data: Organometallics 2004, 23, 5399-5401, the catalyst of formula 4 catalyses, in similar reaction conditions, the formation of product Pl at a yield of 45%.
Example XII. l-[(4-MethylphenyI)sulphonyl]-2,5-dihydro-lH-pyroline, P2. A solution of catalyst 11a (10.8 mg, 5 mol.%) in CH2Cl2 (2.5 ml) was added to a solution of diene S2 (84.1 mg, 0.35 mmol) in CH2Cl2 (15 ml). The contents of the flask were stirred at a temperature of 21-230C for 24 hours. The raw reaction mixture was analysed by gas chromatography. The yield of product P2 was 56%.
In a similar reaction, (pre)catalyst 10a made it possible to obtain Pl at a yield of 41%, (pre)catalyst 10b at a yield of 22% and lib at 29% yield.
Example XIII.
2,2-Diphenyl-3-vinyl-2,5-dihydrofuran, P3. A solution of substrate S3 (86.9 mg, 0.35 mmol) in CH2Cl2 (3.5 ml) was put in a Schlenk flask and a solution of catalyst 10a (2.6 mg, 0.0175 mmol, 5 mol.%) in CH2Cl2 (3 ml) was added at a temperature of 21-23°C. It was stirred at this temperature. A sample (0.25 ml) of the reaction mixture was taken after 24h. The degree of conversion in each sample was calculated on the basis of gas chromatography (95%). Product Pl was identified by comparing with a reference standard. In a similar reaction, (pre)catalyst 10b made it possible to obtain P3 at a yield of 51%, (pre)catalyst 11a at a yield of 72%.
Example XIV.
Use of compound IQa as catalyst in a reaction of ring-opening metathesis. (Scheme XVI).
Polynorbornene P4. Norbornene (S4, 187 mg, 1.4 mmol) in CH2Cl2 (5 ml) was put in a flask and stirred at room temperature. Then a solution of catalyst 1 (8.7 mg, 1 mol.%) was added and the contents of the flask were stirred at the same temperature for 10 min. The flask contents were poured into another vessel containing 15 ml of methyl alcohol and a white solid was precipitated, and was separated by filtration and dried under reduced pressure using a vacuum pump. Product P4 was obtained (122 mg, 92% yield) as a white solid.
BPP/4027/CH5/2006

Claims

Patent claims
1. Complexes of ruthenium or osmium as (pre)catalysts of the metathesis reaction represented by formula 1, in which M denotes ruthenium or osmium,
L denotes a neutral ligand, selected from the group comprising amines, imines, phosphines (preferably), stilbines, arsines, alcohols, thiols, ethers and thioethers or the N-heterocyclic carbene ligand (NHC) represented by formula 9, where
B denotes the methylene (-C-), 1,2-ethylene (-C-C-), 1,3-propenyl (- C-C-C-), 1,2-ethenylene (-C=C-) or azaethenyl (-N=C-) residue, unsubstituted or substituted with halogens, C5-C24 aryl, C1-C6 alkyl, C1-C13 perfluoroalkyl, C1-C6 cycloalkyl groups, moreover the alkyl groups may be joined together in a ring; preferably B denotes 1,2- ethylene (-CH2-CH2-)
R and R' denote, independently of one another, C5-C24 aryl, C5-C24 perfluoroaryl, C1-C26 alkyl, C1-C26 perfluoroalkyl, C1-C7 cycloalkyl groups, unsubstituted or substituted with halogens, C5-C24 aryl, C1- Ce alkyl, C1-C13 perfluoroalkyl, C1-C6 cycloalkyl groups, moreover the alkyl groups may be joined together in a ring, preferably R and R' denote, independently of one another, phenyl groups substituted with C1-C26 alkyl residues, most preferably 2,4,6-trimethylphenyl X and X' denote an anionic ligand, selected independently of one another from the group comprising anions of halogens, the phenolate anion (C6H5O") and perfluorophenolate anion (C6F5O"), residues of arylcarboxylic, alkylcarboxylic, perfluoroalkylcarboxylic, alkylsulphonic, arylsulphonic, perfluoroalkylsulphonic acids, preferably chlorine R1 denotes hydrogen, C1-C5 alkyl, C2-C5 alkene or C3-C7 cycloalkyl, preferably hydrogen
R2, R3, R4, R5, R6, R7 denote, independently, C1-C25 alkyl, C1-C25 perfluoroalkyl, C5-C24 aryl, C2-C25 alkene or C3-C7 cycloalkyl, the nitro (- NO2), cyano (-CN), carboxyl (-C00H), ester (-COOR"), sulphone (- SO2R"), formyl (-CH0), sulphonamide (-SO2NR"2), or ketone (-COR") group, in which groups R" has the following meaning: C1-C5 alkyl, C1-C5 perfluoroalkyl, C5-C24 aryl, A denotes either nitrogen or carbon placed with an R5 group having the meaning given above.
2. Complexes according to Claim 1, characterized in that the compounds with formula 1 have the form of an isomer of formula Ia, in which atoms X and X' are arranged trans relative to one another, as shown in Fig. Ia and an isomer of formula Ib, in which atoms X and X' are arranged cis relative to one another as shown in Fig. Ib.
3. Complexes according to Claim 1, characterized in that, in formula 1, A denotes nitrogen or carbon, in ligand L1, B denotes a 1,2-ethylene (-C-C-) residue, R and R' denote a phenyl residue substituted in at least one of the ortho positions, preferably with a mesityl (2,4,5-trimethylphenyl; Mes) residue.
4. Method of production of complexes of ruthenium and osmium of formula 1, in which:
M denotes ruthenium or osmium,
L denotes a neutral ligand, selected from the group comprising amines, imines, phosphines, preferably stilbines, arsines, alcohols, thiols, ethers and thioethers or the N-heterocyclic carbene ligand (NHC) represented by formula 9, where
B denotes the methylene (-C-), 1,2-ethylene (-C-C-), 1,3-propenyl (- C-C-C-), 1,2-ethenylene (-C=C-) or azaethenyl (-N=C-) residue, unsubstituted or substituted with halogens, with C5-C24 aryl, C1-C6 alkyl, C1-C13 perfluoroalkyl, C1-C6 cycloalkyl groups, moreover the alkyl groups may be joined together in a ring; preferably B denotes 1,2-ethylene (-CH2-CH2-)
R and R1 denote, independently of one another, C5-C24 aryl, C5-C24 perfluoroaryl, C1-C26 alkyl, C1-C26 perfluoroalkyl, C1-C7 cycloalkyl groups, unsubstituted or substituted with halogens, C5-C24 aryl, C1- C6 alkyl, C1-C13 perfluoroalkyl, C1-C6 cycloalkyl groups, moreover the alkyl groups may be joined together in a ring, preferably R and R' denote, independently of one another, phenyl groups substituted with C1-C26 alkyl residues, most preferably 2,4,6-trimethylphenyl
X and X' denote an anionic ligand, selected independently of one another from the group comprising anions of halogens, the phenolate anion (C6H5O") and perfluorophenolate anion (C6F5O"), residues of arylcarboxylic, alkylcarboxylic, perfluoroalkylcarboxylic, alkylsulphonic, arylsulphonic, perfluoroalkylsulphonic acids, preferably chlorine
R1 denotes hydrogen, C1-C5 alkyl, C2-C5 alkene or C3-C7 cycloalkyl, preferably hydrogen
R2, R3, R4, R5, R6, R7 denote, independently, C1-C25 alkyl, C1-C25 perfluoroalkyl, C5-C24 aryl, C2-C25 alkene or C3-C7 cycloalkyl, the nitro (-NO2), cyano (-CN), carboxyl (-C00H), ester (-COOR"), sulphone (-SO2R"), formyl (-CH0), sulphonamide (-SO2NR"2), or ketone (-COR") group, in which groups R" has the following meaning: C1-C5 alkyl, C1-C5 perfluoroalkyl, C5-C24 aryl,
A denotes either nitrogen or carbon placed with an R5 group having the meaning given above, characterized in that an intermediate of formula 5, in which R1, R2, R3, R4,
R5, R6, R7 and A have the meaning given above, is reacted with a carbene complex of ruthenium or osmium of formula 6, in which:
M denotes ruthenium or osmium,
L, L1 and L2 denote, independently of one another, a neutral ligand selected from the group comprising amines, imines, phosphines, preferably stilbines, arsines, alcohols, thiols, ethers and thioethers or an N-heterocyclic carbene ligand (NHC) represented by formula 9, with L2 optionally denoting hydrogen - absence of a ligand (vacancy),
R and R denote, independently of one another, C5-C24 aryl groups, C1-C26 alkyl groups, C1-C7 cycloalkyl groups, unsubstituted or substituted with halogens, with C5-C24 aryl groups, with C1-C6 alkyl, C1-C13 perfluoroalkyl and C1-C6 cycloalkyl groups, and optionally groups R8 and R9 are joined together in a ring or form a fragment of an aromatic compound, preferably R8 denotes hydrogen and R9 denotes phenyl,
X and X' have the meaning given above
5. Method according to Claim 4, characterized in that compounds of formula Ia and Ib are obtained as shown in Scheme II, in a reaction between an N- heterocyclic aromatic compound of formula 5 and a complex of ruthenium or osmium of formula 6, optionally in the presence of a copper(I) salt, preferably copper(I) chloride.
6. Method according to Claim 4, characterized in that the reaction is carried out in chlorinated solvents, or in aliphatic, cycloaliphatic and aromatic hydrocarbons, or in mixtures thereof, preferably in methylene chloride for a time from 1 min to 250 h at a temperature from 0 to 1500C.
7. Method according to Claim 4, characterized in that a pure isomer of formula Ib or a mixture of isomers of formula Ia and of formula Ib, with ratio of Ia to Ib from 100:0 to 0:100, is obtained as a result of isomerization of a solution of compound Ia in chlorinated solvents, preferably methylene chloride, or in aliphatic, cycloaliphatic and aromatic hydrocarbons, or in mixtures thereof for a time from 1 minute to 250 h at a temperature from 0 to 1500C.
8. Method according to Claim 4, characterized in that the sequences of synthesis for production of complexes of formula 1 are shown in Schemes I, III and V, and for synthesis of complexes of formula 10, 11, 12 in Schemes II, IV and VI-XII.
9. Use of complexes of formula 1, in which R1, R2, R3, R4, R5, R6, R7 and A have the meaning given above, characterized in that they are used as (pre)catalysts in a metathesis reaction.
10. Use according to Claim 9, characterized in that compounds of formula 1 are used as (pre)catalysts of ring-closure metathesis, of cross metathesis and of metathesis of the "alkene-alkyne" (ene-yne) type.
11. Use according to Claim 9, characterized in that compounds of formula 1 are used in polymerization processes.
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